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powerpc/64s: Disable preemption in hash lazy mmu mode

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apply_to_page_range on kernel pages does not disable preemption, which
is a requirement for hash's lazy mmu mode, which keeps track of the
TLBs to flush with a per-cpu array.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221013151647.1857994-1-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2022-10-14 01:16:45 +10:00 • committed by Michael Ellerman
parent b12eb279ff
commit b9ef323ea1
1 changed files with 6 additions and 0 deletions
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6
arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
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@ -32,6 +32,11 @@ static inline void arch_enter_lazy_mmu_mode(void)
if (radix_enabled()) if (radix_enabled())
return; return;
/*
* apply_to_page_range can call us this preempt enabled when
* operating on kernel page tables.
*/
preempt_disable();
batch = this_cpu_ptr(&ppc64_tlb_batch); batch = this_cpu_ptr(&ppc64_tlb_batch);
batch->active = 1; batch->active = 1;
} }
@ -47,6 +52,7 @@ static inline void arch_leave_lazy_mmu_mode(void)
if (batch->index) if (batch->index)
__flush_tlb_pending(batch); __flush_tlb_pending(batch);
batch->active = 0; batch->active = 0;
preempt_enable();
} }
#define arch_flush_lazy_mmu_mode() do {} while (0) #define arch_flush_lazy_mmu_mode() do {} while (0)