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ARM: 7703/1: Disable preemption in broadcast_tlb*_a15_erratum()

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Commit 93dc688 (ARM: 7684/1: errata: Workaround for Cortex-A15 erratum
798181 (TLBI/DSB operations)) introduces calls to smp_processor_id() and
smp_call_function_many() with preemption enabled. This patch disables
preemption and also optimises the smp_processor_id() call in
broadcast_tlb_mm_a15_erratum(). The broadcast_tlb_a15_erratum() function
is changed to use smp_call_function() which disables preemption.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Geoff Levand <geoff@infradead.org>
Reported-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2013-04-24 14:41:37 +01:00 committed by Russell King
parent 60d509fa6a
commit 3eb0be3042
1 changed files with 5 additions and 4 deletions
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9
arch/arm/kernel/smp_tlb.c
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@ -98,21 +98,21 @@ static void broadcast_tlb_a15_erratum(void)
return;
dummy_flush_tlb_a15_erratum();
smp_call_function_many(cpu_online_mask, ipi_flush_tlb_a15_erratum,
NULL, 1);
smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1);
}
static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm)
{
int cpu;
int cpu, this_cpu;
cpumask_t mask = { CPU_BITS_NONE };
if (!erratum_a15_798181())
return;
dummy_flush_tlb_a15_erratum();
this_cpu = get_cpu();
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
if (cpu == this_cpu)
continue;
/*
* We only need to send an IPI if the other CPUs are running
@ -127,6 +127,7 @@ static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm)
cpumask_set_cpu(cpu, &mask);
}
smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1);
put_cpu();
}
void flush_tlb_all(void)