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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 <[email protected]>
Signed-off-by: Nicholas Piggin <[email protected]>
Tested-by: Guenter Roeck <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
This commit is contained in:
Nicholas Piggin authored and Michael Ellerman committed 2022-10-18 22:46:18 +11:00
1 parent b12eb279ff
commit b9ef323ea1
1 file changed
+6
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arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
+6
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@@ -32,6 +32,11 @@ static inline void arch_enter_lazy_mmu_mode(void)
if (radix_enabled())
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->active = 1;
}
@@ -47,6 +52,7 @@ static inline void arch_leave_lazy_mmu_mode(void)
if (batch->index)
__flush_tlb_pending(batch);
batch->active = 0;
preempt_enable();
}
#define arch_flush_lazy_mmu_mode() do {} while (0)