2019-05-19 12:08:55 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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2009-01-30 05:22:47 +00:00
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/* Pseudo NMI support on sparc64 systems.
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*
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* Copyright (C) 2009 David S. Miller <davem@davemloft.net>
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*
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* The NMI watchdog support and infrastructure is based almost
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* entirely upon the x86 NMI support code.
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*/
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/init.h>
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#include <linux/percpu.h>
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#include <linux/nmi.h>
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2011-07-22 17:18:16 +00:00
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#include <linux/export.h>
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2009-01-30 05:22:47 +00:00
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#include <linux/kprobes.h>
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#include <linux/kernel_stat.h>
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2009-03-29 22:40:33 +00:00
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#include <linux/reboot.h>
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2009-01-30 05:22:47 +00:00
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#include <linux/slab.h>
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#include <linux/kdebug.h>
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#include <linux/delay.h>
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#include <linux/smp.h>
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perf: Do the big rename: Performance Counters -> Performance Events
Bye-bye Performance Counters, welcome Performance Events!
In the past few months the perfcounters subsystem has grown out its
initial role of counting hardware events, and has become (and is
becoming) a much broader generic event enumeration, reporting, logging,
monitoring, analysis facility.
Naming its core object 'perf_counter' and naming the subsystem
'perfcounters' has become more and more of a misnomer. With pending
code like hw-breakpoints support the 'counter' name is less and
less appropriate.
All in one, we've decided to rename the subsystem to 'performance
events' and to propagate this rename through all fields, variables
and API names. (in an ABI compatible fashion)
The word 'event' is also a bit shorter than 'counter' - which makes
it slightly more convenient to write/handle as well.
Thanks goes to Stephane Eranian who first observed this misnomer and
suggested a rename.
User-space tooling and ABI compatibility is not affected - this patch
should be function-invariant. (Also, defconfigs were not touched to
keep the size down.)
This patch has been generated via the following script:
FILES=$(find * -type f | grep -vE 'oprofile|[^K]config')
sed -i \
-e 's/PERF_EVENT_/PERF_RECORD_/g' \
-e 's/PERF_COUNTER/PERF_EVENT/g' \
-e 's/perf_counter/perf_event/g' \
-e 's/nb_counters/nb_events/g' \
-e 's/swcounter/swevent/g' \
-e 's/tpcounter_event/tp_event/g' \
$FILES
for N in $(find . -name perf_counter.[ch]); do
M=$(echo $N | sed 's/perf_counter/perf_event/g')
mv $N $M
done
FILES=$(find . -name perf_event.*)
sed -i \
-e 's/COUNTER_MASK/REG_MASK/g' \
-e 's/COUNTER/EVENT/g' \
-e 's/\<event\>/event_id/g' \
-e 's/counter/event/g' \
-e 's/Counter/Event/g' \
$FILES
... to keep it as correct as possible. This script can also be
used by anyone who has pending perfcounters patches - it converts
a Linux kernel tree over to the new naming. We tried to time this
change to the point in time where the amount of pending patches
is the smallest: the end of the merge window.
Namespace clashes were fixed up in a preparatory patch - and some
stylistic fallout will be fixed up in a subsequent patch.
( NOTE: 'counters' are still the proper terminology when we deal
with hardware registers - and these sed scripts are a bit
over-eager in renaming them. I've undone some of that, but
in case there's something left where 'counter' would be
better than 'event' we can undo that on an individual basis
instead of touching an otherwise nicely automated patch. )
Suggested-by: Stephane Eranian <eranian@google.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <linux-arch@vger.kernel.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-21 10:02:48 +00:00
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#include <asm/perf_event.h>
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2009-01-30 05:22:47 +00:00
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#include <asm/ptrace.h>
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#include <asm/pcr.h>
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2010-04-14 09:04:29 +00:00
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#include "kstack.h"
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2009-01-30 05:22:47 +00:00
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/* We don't have a real NMI on sparc64, but we can fake one
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* up using profiling counter overflow interrupts and interrupt
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* levels.
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*
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* The profile overflow interrupts at level 15, so we use
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* level 14 as our IRQ off level.
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*/
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static int panic_on_timeout;
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2009-09-09 06:16:06 +00:00
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/* nmi_active:
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* >0: the NMI watchdog is active, but can be disabled
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* <0: the NMI watchdog has not been set up, and cannot be enabled
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* 0: the NMI watchdog is disabled, but can be enabled
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*/
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atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
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EXPORT_SYMBOL(nmi_active);
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2016-12-14 23:06:28 +00:00
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static int nmi_init_done;
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2009-01-30 05:22:47 +00:00
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static unsigned int nmi_hz = HZ;
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2009-09-09 06:16:06 +00:00
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static DEFINE_PER_CPU(short, wd_enabled);
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static int endflag __initdata;
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2009-01-30 05:22:47 +00:00
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static DEFINE_PER_CPU(unsigned int, last_irq_sum);
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2009-10-07 23:04:29 +00:00
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static DEFINE_PER_CPU(long, alert_counter);
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2009-01-30 05:22:47 +00:00
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static DEFINE_PER_CPU(int, nmi_touch);
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2017-07-12 21:35:43 +00:00
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void arch_touch_nmi_watchdog(void)
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2009-01-30 05:22:47 +00:00
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{
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2009-09-09 06:29:16 +00:00
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if (atomic_read(&nmi_active)) {
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2009-01-30 05:22:47 +00:00
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int cpu;
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for_each_present_cpu(cpu) {
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if (per_cpu(nmi_touch, cpu) != 1)
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per_cpu(nmi_touch, cpu) = 1;
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}
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}
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}
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2017-07-12 21:35:43 +00:00
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EXPORT_SYMBOL(arch_touch_nmi_watchdog);
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2009-01-30 05:22:47 +00:00
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static void die_nmi(const char *str, struct pt_regs *regs, int do_panic)
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{
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2014-05-04 05:25:33 +00:00
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int this_cpu = smp_processor_id();
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2009-01-30 05:22:47 +00:00
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if (notify_die(DIE_NMIWATCHDOG, str, regs, 0,
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pt_regs_trap_type(regs), SIGINT) == NOTIFY_STOP)
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return;
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if (do_panic || panic_on_oops)
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2014-05-04 05:25:33 +00:00
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panic("Watchdog detected hard LOCKUP on cpu %d", this_cpu);
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else
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WARN(1, "Watchdog detected hard LOCKUP on cpu %d", this_cpu);
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2009-01-30 05:22:47 +00:00
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}
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notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
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{
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unsigned int sum, touched = 0;
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2010-04-14 09:04:29 +00:00
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void *orig_sp;
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2009-01-30 05:22:47 +00:00
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clear_softint(1 << irq);
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local_cpu_data().__nmi_count++;
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2009-09-10 12:56:16 +00:00
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nmi_enter();
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2010-04-14 09:04:29 +00:00
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orig_sp = set_hardirq_stack();
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2009-01-30 05:22:47 +00:00
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if (notify_die(DIE_NMI, "nmi", regs, 0,
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pt_regs_trap_type(regs), SIGINT) == NOTIFY_STOP)
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touched = 1;
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2010-01-04 23:37:04 +00:00
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else
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2012-08-17 06:31:59 +00:00
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pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_disable);
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2009-01-30 05:22:47 +00:00
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2010-04-07 00:38:52 +00:00
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sum = local_cpu_data().irq0_irqs;
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sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-17 17:30:54 +00:00
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if (__this_cpu_read(nmi_touch)) {
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__this_cpu_write(nmi_touch, 0);
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2009-01-30 05:22:47 +00:00
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touched = 1;
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}
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sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-17 17:30:54 +00:00
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if (!touched && __this_cpu_read(last_irq_sum) == sum) {
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2009-10-29 13:34:15 +00:00
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__this_cpu_inc(alert_counter);
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if (__this_cpu_read(alert_counter) == 30 * nmi_hz)
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2009-01-30 05:22:47 +00:00
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die_nmi("BUG: NMI Watchdog detected LOCKUP",
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regs, panic_on_timeout);
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} else {
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sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-17 17:30:54 +00:00
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__this_cpu_write(last_irq_sum, sum);
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2009-10-29 13:34:15 +00:00
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__this_cpu_write(alert_counter, 0);
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2009-01-30 05:22:47 +00:00
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}
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sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-17 17:30:54 +00:00
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|
|
if (__this_cpu_read(wd_enabled)) {
|
2012-08-17 06:26:01 +00:00
|
|
|
pcr_ops->write_pic(0, pcr_ops->nmi_picl_value(nmi_hz));
|
2012-08-17 06:31:59 +00:00
|
|
|
pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_enable);
|
2009-01-30 05:22:47 +00:00
|
|
|
}
|
2009-09-10 12:56:16 +00:00
|
|
|
|
2010-04-14 09:04:29 +00:00
|
|
|
restore_hardirq_stack(orig_sp);
|
|
|
|
|
|
2009-09-10 12:56:16 +00:00
|
|
|
nmi_exit();
|
2009-01-30 05:22:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline unsigned int get_nmi_count(int cpu)
|
|
|
|
|
{
|
|
|
|
|
return cpu_data(cpu).__nmi_count;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static __init void nmi_cpu_busy(void *data)
|
|
|
|
|
{
|
|
|
|
|
while (endflag == 0)
|
|
|
|
|
mb();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void report_broken_nmi(int cpu, int *prev_nmi_count)
|
|
|
|
|
{
|
|
|
|
|
printk(KERN_CONT "\n");
|
|
|
|
|
|
|
|
|
|
printk(KERN_WARNING
|
|
|
|
|
"WARNING: CPU#%d: NMI appears to be stuck (%d->%d)!\n",
|
|
|
|
|
cpu, prev_nmi_count[cpu], get_nmi_count(cpu));
|
|
|
|
|
|
|
|
|
|
printk(KERN_WARNING
|
|
|
|
|
"Please report this to bugzilla.kernel.org,\n");
|
|
|
|
|
printk(KERN_WARNING
|
|
|
|
|
"and attach the output of the 'dmesg' command.\n");
|
|
|
|
|
|
2009-09-09 06:16:06 +00:00
|
|
|
per_cpu(wd_enabled, cpu) = 0;
|
|
|
|
|
atomic_dec(&nmi_active);
|
2009-01-30 05:22:47 +00:00
|
|
|
}
|
|
|
|
|
|
2009-09-10 13:28:20 +00:00
|
|
|
void stop_nmi_watchdog(void *unused)
|
2009-01-30 05:22:47 +00:00
|
|
|
{
|
2016-12-14 23:06:28 +00:00
|
|
|
if (!__this_cpu_read(wd_enabled))
|
|
|
|
|
return;
|
2012-08-17 06:31:59 +00:00
|
|
|
pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_disable);
|
sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-17 17:30:54 +00:00
|
|
|
__this_cpu_write(wd_enabled, 0);
|
2009-09-09 06:16:06 +00:00
|
|
|
atomic_dec(&nmi_active);
|
2009-01-30 05:22:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int __init check_nmi_watchdog(void)
|
|
|
|
|
{
|
|
|
|
|
unsigned int *prev_nmi_count;
|
|
|
|
|
int cpu, err;
|
|
|
|
|
|
2009-09-09 06:16:06 +00:00
|
|
|
if (!atomic_read(&nmi_active))
|
|
|
|
|
return 0;
|
|
|
|
|
|
treewide: kmalloc() -> kmalloc_array()
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This
patch replaces cases of:
kmalloc(a * b, gfp)
with:
kmalloc_array(a * b, gfp)
as well as handling cases of:
kmalloc(a * b * c, gfp)
with:
kmalloc(array3_size(a, b, c), gfp)
as it's slightly less ugly than:
kmalloc_array(array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
kmalloc(4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
The tools/ directory was manually excluded, since it has its own
implementation of kmalloc().
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@
(
kmalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
|
kmalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@
(
kmalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
|
kmalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
|
kmalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
|
kmalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@
- kmalloc
+ kmalloc_array
(
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
kmalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
kmalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@
(
kmalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
kmalloc(sizeof(THING) * C2, ...)
|
kmalloc(sizeof(TYPE) * C2, ...)
|
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(C1 * C2, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * E2
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * (E2)
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 20:55:00 +00:00
|
|
|
prev_nmi_count = kmalloc_array(nr_cpu_ids, sizeof(unsigned int),
|
|
|
|
|
GFP_KERNEL);
|
2009-01-30 05:22:47 +00:00
|
|
|
if (!prev_nmi_count) {
|
|
|
|
|
err = -ENOMEM;
|
|
|
|
|
goto error;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
printk(KERN_INFO "Testing NMI watchdog ... ");
|
|
|
|
|
|
|
|
|
|
smp_call_function(nmi_cpu_busy, (void *)&endflag, 0);
|
|
|
|
|
|
|
|
|
|
for_each_possible_cpu(cpu)
|
|
|
|
|
prev_nmi_count[cpu] = get_nmi_count(cpu);
|
|
|
|
|
local_irq_enable();
|
|
|
|
|
mdelay((20 * 1000) / nmi_hz); /* wait 20 ticks */
|
|
|
|
|
|
|
|
|
|
for_each_online_cpu(cpu) {
|
2009-09-09 06:16:06 +00:00
|
|
|
if (!per_cpu(wd_enabled, cpu))
|
|
|
|
|
continue;
|
2009-01-30 05:22:47 +00:00
|
|
|
if (get_nmi_count(cpu) - prev_nmi_count[cpu] <= 5)
|
|
|
|
|
report_broken_nmi(cpu, prev_nmi_count);
|
|
|
|
|
}
|
|
|
|
|
endflag = 1;
|
2009-09-09 06:16:06 +00:00
|
|
|
if (!atomic_read(&nmi_active)) {
|
2009-01-30 05:22:47 +00:00
|
|
|
kfree(prev_nmi_count);
|
2009-09-09 06:16:06 +00:00
|
|
|
atomic_set(&nmi_active, -1);
|
2009-01-30 05:22:47 +00:00
|
|
|
err = -ENODEV;
|
|
|
|
|
goto error;
|
|
|
|
|
}
|
|
|
|
|
printk("OK.\n");
|
|
|
|
|
|
|
|
|
|
nmi_hz = 1;
|
|
|
|
|
|
|
|
|
|
kfree(prev_nmi_count);
|
|
|
|
|
return 0;
|
|
|
|
|
error:
|
2009-09-09 06:16:06 +00:00
|
|
|
on_each_cpu(stop_nmi_watchdog, NULL, 1);
|
2009-01-30 05:22:47 +00:00
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
2009-09-10 13:28:20 +00:00
|
|
|
void start_nmi_watchdog(void *unused)
|
2009-09-09 06:16:06 +00:00
|
|
|
{
|
2016-12-14 23:06:28 +00:00
|
|
|
if (__this_cpu_read(wd_enabled))
|
|
|
|
|
return;
|
|
|
|
|
|
sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-17 17:30:54 +00:00
|
|
|
__this_cpu_write(wd_enabled, 1);
|
2009-09-09 06:16:06 +00:00
|
|
|
atomic_inc(&nmi_active);
|
|
|
|
|
|
2012-08-17 06:31:59 +00:00
|
|
|
pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_disable);
|
2012-08-17 06:26:01 +00:00
|
|
|
pcr_ops->write_pic(0, pcr_ops->nmi_picl_value(nmi_hz));
|
2009-09-09 06:16:06 +00:00
|
|
|
|
2012-08-17 06:31:59 +00:00
|
|
|
pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_enable);
|
2009-09-09 06:16:06 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void nmi_adjust_hz_one(void *unused)
|
2009-01-30 05:22:47 +00:00
|
|
|
{
|
sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-17 17:30:54 +00:00
|
|
|
if (!__this_cpu_read(wd_enabled))
|
2009-09-09 06:16:06 +00:00
|
|
|
return;
|
|
|
|
|
|
2012-08-17 06:31:59 +00:00
|
|
|
pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_disable);
|
2012-08-17 06:26:01 +00:00
|
|
|
pcr_ops->write_pic(0, pcr_ops->nmi_picl_value(nmi_hz));
|
2009-01-30 05:22:47 +00:00
|
|
|
|
2012-08-17 06:31:59 +00:00
|
|
|
pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_enable);
|
2009-01-30 05:22:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void nmi_adjust_hz(unsigned int new_hz)
|
|
|
|
|
{
|
|
|
|
|
nmi_hz = new_hz;
|
2009-09-09 06:16:06 +00:00
|
|
|
on_each_cpu(nmi_adjust_hz_one, NULL, 1);
|
2009-01-30 05:22:47 +00:00
|
|
|
}
|
|
|
|
|
EXPORT_SYMBOL_GPL(nmi_adjust_hz);
|
|
|
|
|
|
2009-03-29 22:40:33 +00:00
|
|
|
static int nmi_shutdown(struct notifier_block *nb, unsigned long cmd, void *p)
|
|
|
|
|
{
|
2009-09-09 06:16:06 +00:00
|
|
|
on_each_cpu(stop_nmi_watchdog, NULL, 1);
|
2009-03-29 22:40:33 +00:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static struct notifier_block nmi_reboot_notifier = {
|
|
|
|
|
.notifier_call = nmi_shutdown,
|
|
|
|
|
};
|
|
|
|
|
|
2009-01-30 05:22:47 +00:00
|
|
|
int __init nmi_init(void)
|
|
|
|
|
{
|
2009-03-29 22:40:33 +00:00
|
|
|
int err;
|
|
|
|
|
|
2009-09-09 06:16:06 +00:00
|
|
|
on_each_cpu(start_nmi_watchdog, NULL, 1);
|
2009-01-30 05:22:47 +00:00
|
|
|
|
2009-03-29 22:40:33 +00:00
|
|
|
err = check_nmi_watchdog();
|
|
|
|
|
if (!err) {
|
|
|
|
|
err = register_reboot_notifier(&nmi_reboot_notifier);
|
|
|
|
|
if (err) {
|
2009-09-09 06:16:06 +00:00
|
|
|
on_each_cpu(stop_nmi_watchdog, NULL, 1);
|
|
|
|
|
atomic_set(&nmi_active, -1);
|
2009-03-29 22:40:33 +00:00
|
|
|
}
|
|
|
|
|
}
|
2009-09-10 13:28:20 +00:00
|
|
|
|
2016-12-14 23:06:28 +00:00
|
|
|
nmi_init_done = 1;
|
|
|
|
|
|
2009-03-29 22:40:33 +00:00
|
|
|
return err;
|
2009-01-30 05:22:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int __init setup_nmi_watchdog(char *str)
|
|
|
|
|
{
|
|
|
|
|
if (!strncmp(str, "panic", 5))
|
|
|
|
|
panic_on_timeout = 1;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
__setup("nmi_watchdog=", setup_nmi_watchdog);
|
2016-12-14 23:06:28 +00:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* sparc specific NMI watchdog enable function.
|
|
|
|
|
* Enables watchdog if it is not enabled already.
|
|
|
|
|
*/
|
|
|
|
|
int watchdog_nmi_enable(unsigned int cpu)
|
|
|
|
|
{
|
|
|
|
|
if (atomic_read(&nmi_active) == -1) {
|
|
|
|
|
pr_warn("NMI watchdog cannot be enabled or disabled\n");
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* watchdog thread could start even before nmi_init is called.
|
|
|
|
|
* Just Return in that case. Let nmi_init finish the init
|
|
|
|
|
* process first.
|
|
|
|
|
*/
|
|
|
|
|
if (!nmi_init_done)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
smp_call_function_single(cpu, start_nmi_watchdog, NULL, 1);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* sparc specific NMI watchdog disable function.
|
|
|
|
|
* Disables watchdog if it is not disabled already.
|
|
|
|
|
*/
|
|
|
|
|
void watchdog_nmi_disable(unsigned int cpu)
|
|
|
|
|
{
|
|
|
|
|
if (atomic_read(&nmi_active) == -1)
|
|
|
|
|
pr_warn_once("NMI watchdog cannot be enabled or disabled\n");
|
|
|
|
|
else
|
|
|
|
|
smp_call_function_single(cpu, stop_nmi_watchdog, NULL, 1);
|
|
|
|
|
}
|
