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linux/include/asm-generic/percpu.h
Heiko Carstens 7f8d61f005 percpu: use notrace variant of preempt_disable/preempt_enable 
Commit 345ddcc882 ("ftrace: Have set_ftrace_pid use the bitmap like
events do") added a couple of this_cpu_read calls to the ftrace code.

On x86 this is not a problem, since it has single instructions to read
percpu data. Other architectures which use the generic variant now
have additional preempt_disable and preempt_enable calls in the core
ftrace code. This may lead to recursive calls and in result to a dead
machine, e.g. if preemption and debugging options are enabled.

To fix this use the notrace variant of preempt_disable and
preempt_enable within the generic percpu code.

Reported-and-bisected-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Tested-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Fixes: 345ddcc882 ("ftrace: Have set_ftrace_pid use the bitmap like events do")
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-11-08 10:29:44 +01:00

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#ifndef _ASM_GENERIC_PERCPU_H_
#define _ASM_GENERIC_PERCPU_H_
#include <linux/compiler.h>
#include <linux/threads.h>
#include <linux/percpu-defs.h>
#ifdef CONFIG_SMP
/*
* per_cpu_offset() is the offset that has to be added to a
* percpu variable to get to the instance for a certain processor.
*
* Most arches use the __per_cpu_offset array for those offsets but
* some arches have their own ways of determining the offset (x86_64, s390).
*/
#ifndef __per_cpu_offset
extern unsigned long __per_cpu_offset[NR_CPUS];
#define per_cpu_offset(x) (__per_cpu_offset[x])
#endif
/*
* Determine the offset for the currently active processor.
* An arch may define __my_cpu_offset to provide a more effective
* means of obtaining the offset to the per cpu variables of the
* current processor.
*/
#ifndef __my_cpu_offset
#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())
#endif
#ifdef CONFIG_DEBUG_PREEMPT
#define my_cpu_offset per_cpu_offset(smp_processor_id())
#else
#define my_cpu_offset __my_cpu_offset
#endif
/*
* Arch may define arch_raw_cpu_ptr() to provide more efficient address
* translations for raw_cpu_ptr().
*/
#ifndef arch_raw_cpu_ptr
#define arch_raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
#endif
#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
extern void setup_per_cpu_areas(void);
#endif
#endif /* SMP */
#ifndef PER_CPU_BASE_SECTION
#ifdef CONFIG_SMP
#define PER_CPU_BASE_SECTION ".data..percpu"
#else
#define PER_CPU_BASE_SECTION ".data"
#endif
#endif
#ifndef PER_CPU_ATTRIBUTES
#define PER_CPU_ATTRIBUTES
#endif
#ifndef PER_CPU_DEF_ATTRIBUTES
#define PER_CPU_DEF_ATTRIBUTES
#endif
#define raw_cpu_generic_read(pcp) \
({ \
*raw_cpu_ptr(&(pcp)); \
})
#define raw_cpu_generic_to_op(pcp, val, op) \
do { \
*raw_cpu_ptr(&(pcp)) op val; \
} while (0)
#define raw_cpu_generic_add_return(pcp, val) \
({ \
typeof(&(pcp)) __p = raw_cpu_ptr(&(pcp)); \
\
*__p += val; \
*__p; \
})
#define raw_cpu_generic_xchg(pcp, nval) \
({ \
typeof(&(pcp)) __p = raw_cpu_ptr(&(pcp)); \
typeof(pcp) __ret; \
__ret = *__p; \
*__p = nval; \
__ret; \
})
#define raw_cpu_generic_cmpxchg(pcp, oval, nval) \
({ \
typeof(&(pcp)) __p = raw_cpu_ptr(&(pcp)); \
typeof(pcp) __ret; \
__ret = *__p; \
if (__ret == (oval)) \
*__p = nval; \
__ret; \
})
#define raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
({ \
typeof(&(pcp1)) __p1 = raw_cpu_ptr(&(pcp1)); \
typeof(&(pcp2)) __p2 = raw_cpu_ptr(&(pcp2)); \
int __ret = 0; \
if (*__p1 == (oval1) && *__p2 == (oval2)) { \
*__p1 = nval1; \
*__p2 = nval2; \
__ret = 1; \
} \
(__ret); \
})
#define this_cpu_generic_read(pcp) \
({ \
typeof(pcp) __ret; \
preempt_disable_notrace(); \
__ret = raw_cpu_generic_read(pcp); \
preempt_enable_notrace(); \
__ret; \
})
#define this_cpu_generic_to_op(pcp, val, op) \
do { \
unsigned long __flags; \
raw_local_irq_save(__flags); \
raw_cpu_generic_to_op(pcp, val, op); \
raw_local_irq_restore(__flags); \
} while (0)
#define this_cpu_generic_add_return(pcp, val) \
({ \
typeof(pcp) __ret; \
unsigned long __flags; \
raw_local_irq_save(__flags); \
__ret = raw_cpu_generic_add_return(pcp, val); \
raw_local_irq_restore(__flags); \
__ret; \
})
#define this_cpu_generic_xchg(pcp, nval) \
({ \
typeof(pcp) __ret; \
unsigned long __flags; \
raw_local_irq_save(__flags); \
__ret = raw_cpu_generic_xchg(pcp, nval); \
raw_local_irq_restore(__flags); \
__ret; \
})
#define this_cpu_generic_cmpxchg(pcp, oval, nval) \
({ \
typeof(pcp) __ret; \
unsigned long __flags; \
raw_local_irq_save(__flags); \
__ret = raw_cpu_generic_cmpxchg(pcp, oval, nval); \
raw_local_irq_restore(__flags); \
__ret; \
})
#define this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
({ \
int __ret; \
unsigned long __flags; \
raw_local_irq_save(__flags); \
__ret = raw_cpu_generic_cmpxchg_double(pcp1, pcp2, \
oval1, oval2, nval1, nval2); \
raw_local_irq_restore(__flags); \
__ret; \
})
#ifndef raw_cpu_read_1
#define raw_cpu_read_1(pcp) raw_cpu_generic_read(pcp)
#endif
#ifndef raw_cpu_read_2
#define raw_cpu_read_2(pcp) raw_cpu_generic_read(pcp)
#endif
#ifndef raw_cpu_read_4
#define raw_cpu_read_4(pcp) raw_cpu_generic_read(pcp)
#endif
#ifndef raw_cpu_read_8
#define raw_cpu_read_8(pcp) raw_cpu_generic_read(pcp)
#endif
#ifndef raw_cpu_write_1
#define raw_cpu_write_1(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef raw_cpu_write_2
#define raw_cpu_write_2(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef raw_cpu_write_4
#define raw_cpu_write_4(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef raw_cpu_write_8
#define raw_cpu_write_8(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef raw_cpu_add_1
#define raw_cpu_add_1(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef raw_cpu_add_2
#define raw_cpu_add_2(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef raw_cpu_add_4
#define raw_cpu_add_4(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef raw_cpu_add_8
#define raw_cpu_add_8(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef raw_cpu_and_1
#define raw_cpu_and_1(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef raw_cpu_and_2
#define raw_cpu_and_2(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef raw_cpu_and_4
#define raw_cpu_and_4(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef raw_cpu_and_8
#define raw_cpu_and_8(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef raw_cpu_or_1
#define raw_cpu_or_1(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef raw_cpu_or_2
#define raw_cpu_or_2(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef raw_cpu_or_4
#define raw_cpu_or_4(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef raw_cpu_or_8
#define raw_cpu_or_8(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef raw_cpu_add_return_1
#define raw_cpu_add_return_1(pcp, val) raw_cpu_generic_add_return(pcp, val)
#endif
#ifndef raw_cpu_add_return_2
#define raw_cpu_add_return_2(pcp, val) raw_cpu_generic_add_return(pcp, val)
#endif
#ifndef raw_cpu_add_return_4
#define raw_cpu_add_return_4(pcp, val) raw_cpu_generic_add_return(pcp, val)
#endif
#ifndef raw_cpu_add_return_8
#define raw_cpu_add_return_8(pcp, val) raw_cpu_generic_add_return(pcp, val)
#endif
#ifndef raw_cpu_xchg_1
#define raw_cpu_xchg_1(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
#endif
#ifndef raw_cpu_xchg_2
#define raw_cpu_xchg_2(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
#endif
#ifndef raw_cpu_xchg_4
#define raw_cpu_xchg_4(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
#endif
#ifndef raw_cpu_xchg_8
#define raw_cpu_xchg_8(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
#endif
#ifndef raw_cpu_cmpxchg_1
#define raw_cpu_cmpxchg_1(pcp, oval, nval) \
raw_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef raw_cpu_cmpxchg_2
#define raw_cpu_cmpxchg_2(pcp, oval, nval) \
raw_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef raw_cpu_cmpxchg_4
#define raw_cpu_cmpxchg_4(pcp, oval, nval) \
raw_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef raw_cpu_cmpxchg_8
#define raw_cpu_cmpxchg_8(pcp, oval, nval) \
raw_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef raw_cpu_cmpxchg_double_1
#define raw_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \
raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef raw_cpu_cmpxchg_double_2
#define raw_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \
raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef raw_cpu_cmpxchg_double_4
#define raw_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \
raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef raw_cpu_cmpxchg_double_8
#define raw_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \
raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef this_cpu_read_1
#define this_cpu_read_1(pcp) this_cpu_generic_read(pcp)
#endif
#ifndef this_cpu_read_2
#define this_cpu_read_2(pcp) this_cpu_generic_read(pcp)
#endif
#ifndef this_cpu_read_4
#define this_cpu_read_4(pcp) this_cpu_generic_read(pcp)
#endif
#ifndef this_cpu_read_8
#define this_cpu_read_8(pcp) this_cpu_generic_read(pcp)
#endif
#ifndef this_cpu_write_1
#define this_cpu_write_1(pcp, val) this_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef this_cpu_write_2
#define this_cpu_write_2(pcp, val) this_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef this_cpu_write_4
#define this_cpu_write_4(pcp, val) this_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef this_cpu_write_8
#define this_cpu_write_8(pcp, val) this_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef this_cpu_add_1
#define this_cpu_add_1(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef this_cpu_add_2
#define this_cpu_add_2(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef this_cpu_add_4
#define this_cpu_add_4(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef this_cpu_add_8
#define this_cpu_add_8(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef this_cpu_and_1
#define this_cpu_and_1(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef this_cpu_and_2
#define this_cpu_and_2(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef this_cpu_and_4
#define this_cpu_and_4(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef this_cpu_and_8
#define this_cpu_and_8(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef this_cpu_or_1
#define this_cpu_or_1(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef this_cpu_or_2
#define this_cpu_or_2(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef this_cpu_or_4
#define this_cpu_or_4(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef this_cpu_or_8
#define this_cpu_or_8(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef this_cpu_add_return_1
#define this_cpu_add_return_1(pcp, val) this_cpu_generic_add_return(pcp, val)
#endif
#ifndef this_cpu_add_return_2
#define this_cpu_add_return_2(pcp, val) this_cpu_generic_add_return(pcp, val)
#endif
#ifndef this_cpu_add_return_4
#define this_cpu_add_return_4(pcp, val) this_cpu_generic_add_return(pcp, val)
#endif
#ifndef this_cpu_add_return_8
#define this_cpu_add_return_8(pcp, val) this_cpu_generic_add_return(pcp, val)
#endif
#ifndef this_cpu_xchg_1
#define this_cpu_xchg_1(pcp, nval) this_cpu_generic_xchg(pcp, nval)
#endif
#ifndef this_cpu_xchg_2
#define this_cpu_xchg_2(pcp, nval) this_cpu_generic_xchg(pcp, nval)
#endif
#ifndef this_cpu_xchg_4
#define this_cpu_xchg_4(pcp, nval) this_cpu_generic_xchg(pcp, nval)
#endif
#ifndef this_cpu_xchg_8
#define this_cpu_xchg_8(pcp, nval) this_cpu_generic_xchg(pcp, nval)
#endif
#ifndef this_cpu_cmpxchg_1
#define this_cpu_cmpxchg_1(pcp, oval, nval) \
this_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef this_cpu_cmpxchg_2
#define this_cpu_cmpxchg_2(pcp, oval, nval) \
this_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef this_cpu_cmpxchg_4
#define this_cpu_cmpxchg_4(pcp, oval, nval) \
this_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef this_cpu_cmpxchg_8
#define this_cpu_cmpxchg_8(pcp, oval, nval) \
this_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef this_cpu_cmpxchg_double_1
#define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \
this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef this_cpu_cmpxchg_double_2
#define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \
this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef this_cpu_cmpxchg_double_4
#define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \
this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef this_cpu_cmpxchg_double_8
#define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \
this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#endif /* _ASM_GENERIC_PERCPU_H_ */
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