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powerpc/64s: Use dec_mm_active_cpus helper

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Avoid open-coded atomic_dec on mm->context.active_cpus and use the
function made for it. Add CONFIG_DEBUG_VM underflow checking on the
counter.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230524060821.148015-3-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2023-05-24 16:08:19 +10:00 committed by Michael Ellerman
parent c3c2e93753
commit f74b2a6c01
3 changed files with 3 additions and 2 deletions
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2
arch/powerpc/include/asm/book3s/64/mmu.h
View File

@ -261,7 +261,7 @@ static inline void radix_init_pseries(void) { }
#define arch_clear_mm_cpumask_cpu(cpu, mm) \
do { \
if (cpumask_test_cpu(cpu, mm_cpumask(mm))) { \
atomic_dec(&(mm)->context.active_cpus); \
dec_mm_active_cpus(mm); \
cpumask_clear_cpu(cpu, mm_cpumask(mm)); \
} \
} while (0)

1
arch/powerpc/include/asm/mmu_context.h
View File

@ -127,6 +127,7 @@ static inline void inc_mm_active_cpus(struct mm_struct *mm)
static inline void dec_mm_active_cpus(struct mm_struct *mm)
{
VM_WARN_ON_ONCE(atomic_read(&mm->context.active_cpus) <= 0);
atomic_dec(&mm->context.active_cpus);
}

2
arch/powerpc/mm/book3s64/radix_tlb.c
View File

@ -820,7 +820,7 @@ void exit_lazy_flush_tlb(struct mm_struct *mm, bool always_flush)
* that's what the caller expects.
*/
if (cpumask_test_cpu(cpu, mm_cpumask(mm))) {
atomic_dec(&mm->context.active_cpus);
dec_mm_active_cpus(mm);
cpumask_clear_cpu(cpu, mm_cpumask(mm));
always_flush = true;
}