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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-19 15:20:58 +0000 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-07-12 04:32:11 +0100 |
| commit | bd00fcf3ec0c7fc0b194ba37a07564517fed11b8 (patch) | |
| tree | 649366384c417458b69ce6cd84d04ae6c0b85321 /arch/arm/kernel | |
| parent | a9f1af04f086656246f30354fb4564ce3b08c4a0 (diff) | |
| download | kernel_samsung_smdk4412-bd00fcf3ec0c7fc0b194ba37a07564517fed11b8.zip kernel_samsung_smdk4412-bd00fcf3ec0c7fc0b194ba37a07564517fed11b8.tar.gz kernel_samsung_smdk4412-bd00fcf3ec0c7fc0b194ba37a07564517fed11b8.tar.bz2 | |
ARM: fix rcu stalls on SMP platforms
commit 7deabca0acfe02b8e18f59a4c95676012f49a304 upstream.
We can stall RCU processing on SMP platforms if a CPU sits in its idle
loop for a long time. This happens because we don't call irq_enter()
and irq_exit() around generic_smp_call_function_interrupt() and
friends. Add the necessary calls, and remove the one from within
ipi_timer(), so that they're all in a common place.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/smp.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index e10e59a..1d1710e 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -471,9 +471,7 @@ static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent); static void ipi_timer(void) { struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent); - irq_enter(); evt->event_handler(evt); - irq_exit(); } #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST @@ -572,7 +570,9 @@ void handle_IPI(int ipinr, struct pt_regs *regs) switch (ipinr) { case IPI_TIMER: + irq_enter(); ipi_timer(); + irq_exit(); break; case IPI_RESCHEDULE: @@ -580,15 +580,21 @@ void handle_IPI(int ipinr, struct pt_regs *regs) break; case IPI_CALL_FUNC: + irq_enter(); generic_smp_call_function_interrupt(); + irq_exit(); break; case IPI_CALL_FUNC_SINGLE: + irq_enter(); generic_smp_call_function_single_interrupt(); + irq_exit(); break; case IPI_CPU_STOP: + irq_enter(); ipi_cpu_stop(cpu); + irq_exit(); break; default: |