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2b25d9f64b
linux/arch/mips/kernel
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Jayachandran C cf9bfe55f2 MIPS: Synchronize MIPS count one CPU at a time 
The current implementation of synchronise_count_{master,slave} blocks
slave CPUs in early boot until all of them come up. This no longer
works because blocking a CPU with interrupts off after notifying the
CPU to be online causes problems with the current kernel.

Specifically, after the workqueue changes
(commit a08489c569 "Pull workqueue changes from Tejun Heo")
the CPU_ONLINE notification callback workqueue_cpu_up_callback()
will hang on wait_for_completion(&idle_rebind.done), if the slave
CPUs are blocked for synchronize_count_slave().

The changes are to update synchronize_count_{master,slave}() to handle
one CPU at a time and to call synchronise_count_master() in __cpu_up()
so that the CPU_ONLINE notification goes out only after the COP0 COUNT
register is synchronized.

[ralf@linux-mips.org: This matter only to those few platforms which are
using the cp0 counter as their clocksource which are XLP, XLR and MIPS'
CMP solution.]

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/4216/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2012-08-17 10:57:28 +02:00
..
cpufreq MIPS: Loongson 2: Sort out clock managment. 2012-08-01 18:10:06 +02:00
.gitignore
8250-platform.c mips: remove needless include of module.h from core kernel files. 2011-10-31 19:30:57 -04:00
asm-offsets.c
binfmt_elfn32.c
binfmt_elfo32.c
bmips_vec.S MIPS: BMIPS: Add SMP support code for BMIPS43xx/BMIPS5000 2011-12-07 22:03:18 +00:00
branch.c MIPS Kprobes: Refactor branch emulation 2011-12-07 22:04:03 +00:00
cevt-bcm1480.c MIPS: irq: Remove IRQF_DISABLED 2011-12-07 22:03:45 +00:00
cevt-ds1287.c MIPS: irq: Remove IRQF_DISABLED 2011-12-07 22:03:45 +00:00
cevt-gt641xx.c MIPS: irq: Remove IRQF_DISABLED 2011-12-07 22:03:45 +00:00
cevt-r4k.c MIPS: irq: Remove IRQF_DISABLED 2011-12-07 22:03:45 +00:00
cevt-sb1250.c MIPS: irq: Remove IRQF_DISABLED 2011-12-07 22:03:45 +00:00
cevt-smtc.c
cevt-txx9.c MIPS: irq: Remove IRQF_DISABLED 2011-12-07 22:03:45 +00:00
cpu-bugs64.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
cpu-probe.c MIPS: Add CPU support for Loongson1B 2012-07-23 13:57:04 +01:00
csrc-bcm1480.c mips: convert to clocksource_register_hz/khz 2011-02-21 13:33:50 -08:00
csrc-ioasic.c mips: convert to clocksource_register_hz/khz 2011-02-21 13:33:50 -08:00
csrc-powertv.c mips: convert to clocksource_register_hz/khz 2011-02-21 13:33:50 -08:00
csrc-r4k.c mips: convert to clocksource_register_hz/khz 2011-02-21 13:33:50 -08:00
csrc-sb1250.c mips: convert to clocksource_register_hz/khz 2011-02-21 13:33:50 -08:00
early_printk.c
entry.S MIPS: Split do_syscall_trace into two functions. 2011-05-19 09:55:44 +01:00
ftrace.c MIPS: Ftrace: Fix the CONFIG_DYNAMIC_FTRACE=n compile 2011-09-21 17:52:04 +02:00
genex.S
gpio_txx9.c
head.S
i8253.c MIPS: irq: Remove IRQF_DISABLED 2011-12-07 22:03:45 +00:00
i8259.c MIPS: i8259: Mark cascade interrupt non-threaded 2011-09-21 17:52:28 +02:00
irq_cpu.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
irq_txx9.c MIPS: Convert the irq functions to the new names 2011-03-29 14:48:07 +02:00
irq-gic.c MIPS: Convert the irq functions to the new names 2011-03-29 14:48:07 +02:00
irq-gt641xx.c MIPS: Convert the irq functions to the new names 2011-03-29 14:48:07 +02:00
irq-msc01.c mips: remove needless include of module.h from core kernel files. 2011-10-31 19:30:57 -04:00
irq-rm7000.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
irq-rm9000.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
irq.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
jump_label.c MIPS: jump label: Add MIPS support. 2011-01-18 19:30:24 +01:00
kgdb.c
kprobes.c MIPS Kprobes: Support branch instructions probing 2011-12-07 22:04:03 +00:00
kspd.c posix_types.h: Cleanup stale __NFDBITS and related definitions 2012-07-26 13:36:43 -07:00
linux32.c MIPS: Compat: Use 32-bit wrapper for compat_sys_futex. 2011-09-21 17:53:44 +02:00
machine_kexec.c
Makefile mips: Use generic init_task 2012-05-05 13:00:24 +02:00
mcount.S
mips_ksyms.c MIPS: Refactor 'clear_page' and 'copy_page' functions. 2012-07-19 11:23:43 +02:00
mips_machine.c MIPS: Add generic support for multiple machines within a single kernel 2011-01-18 19:30:21 +01:00
mips-mt-fpaff.c remove references to cpu_*_map in arch/ 2012-03-29 15:38:30 +10:30
mips-mt.c Merge branch 'master' into for-next 2012-04-08 21:48:52 +02:00
module.c MIPS: Module: Deal with malformed HI16/LO16 relocation sequences. 2012-08-17 10:57:28 +02:00
octeon_switch.S MIPS: Fix race condition with FPU thread task flag during context switch. 2012-07-19 11:23:43 +02:00
perf_event_mipsxx.c MIPS: Add CPU support for Loongson1B 2012-07-23 13:57:04 +01:00
perf_event.c MIPS: perf: Reorganize contents of perf support files. 2011-10-24 23:34:26 +01:00
proc.c MIPS: Code formatting fixes. 2012-05-15 17:48:39 +02:00
process.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
prom.c MIPS: Prune some target specific code out of prom.c 2012-07-23 13:54:52 +01:00
ptrace32.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
ptrace.c seccomp: ignore secure_computing return values 2012-04-18 12:24:50 +10:00
r4k_fpu.S update David Miller's old email address 2011-04-06 06:19:38 -07:00
r4k_switch.S MIPS: Fix race condition with FPU thread task flag during context switch. 2012-07-19 11:23:43 +02:00
r2300_fpu.S update David Miller's old email address 2011-04-06 06:19:38 -07:00
r2300_switch.S MIPS: Fix race condition with FPU thread task flag during context switch. 2012-07-19 11:23:43 +02:00
r6000_fpu.S update David Miller's old email address 2011-04-06 06:19:38 -07:00
relocate_kernel.S
reset.c mips: migrate core kernel file from module.h --> export.h 2011-10-31 19:30:56 -04:00
rtlx.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
scall32-o32.S MIPS: Hook up process_vm_readv and process_vm_writev system calls. 2011-11-09 00:07:56 +00:00
scall64-64.S MIPS: Hook up process_vm_readv and process_vm_writev system calls. 2011-11-09 00:07:56 +00:00
scall64-n32.S MIPS: Hook up process_vm_readv and process_vm_writev system calls. 2011-11-09 00:07:56 +00:00
scall64-o32.S MIPS: Hook up process_vm_readv and process_vm_writev system calls. 2011-11-09 00:07:56 +00:00
setup.c MIPS: Move cache setup to setup_arch(). 2012-05-16 23:34:34 +02:00
signal32.c most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set 2012-06-01 12:58:51 -04:00
signal_n32.c most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set 2012-06-01 12:58:51 -04:00
signal-common.h most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set 2012-06-01 12:58:51 -04:00
signal.c new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
smp-bmips.c MIPS: BMIPS: delay irq enable to ->smp_finish() 2012-07-19 11:23:44 +02:00
smp-cmp.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
smp-mt.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
smp-up.c
smp.c MIPS: Synchronize MIPS count one CPU at a time 2012-08-17 10:57:28 +02:00
smtc-asm.S
smtc-proc.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
smtc.c MIPS: SMTC: Support for Multi-threaded FPUs 2012-07-23 13:55:53 +01:00
spinlock_test.c mips: migrate core kernel file from module.h --> export.h 2011-10-31 19:30:56 -04:00
spram.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
stacktrace.c mips: migrate core kernel file from module.h --> export.h 2011-10-31 19:30:56 -04:00
sync-r4k.c MIPS: Synchronize MIPS count one CPU at a time 2012-08-17 10:57:28 +02:00
syscall.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
time.c mips: migrate core kernel file from module.h --> export.h 2011-10-31 19:30:56 -04:00
topology.c
traps.c MIPS: Add CPU support for Loongson1B 2012-07-23 13:57:04 +01:00
unaligned.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
vdso.c coredump: remove VM_ALWAYSDUMP flag 2012-03-23 16:58:42 -07:00
vmlinux.lds.S MIPS: Properly align the .data..init_task section. 2012-07-19 11:23:43 +02:00
vpe.c Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
watch.c