[PATCH 1/2] powerpc: Allow nesting of lazy MMU mode
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: 2023-10-12 19:54:31
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
As noted in commit 49147beb0ccb ("x86/xen: allow nesting of same lazy
mode"), we can now nest calls to arch_enter_lazy_mmu_mode(). Use ->active
as a counter instead of a flag and only drain the batch when the counter
hits 0.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Fixes: bcc6cc832573 ("mm: add default definition of set_ptes()")
---
arch/powerpc/include/asm/book3s/64/tlbflush-hash.h | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
index 146287d9580f..bc845d876ed2 100644
--- a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h@@ -38,7 +38,7 @@ static inline void arch_enter_lazy_mmu_mode(void) */ preempt_disable(); batch = this_cpu_ptr(&ppc64_tlb_batch); - batch->active = 1; + batch->active++; } static inline void arch_leave_lazy_mmu_mode(void)
@@ -49,9 +49,8 @@ static inline void arch_leave_lazy_mmu_mode(void) return; batch = this_cpu_ptr(&ppc64_tlb_batch); - if (batch->index) + if ((--batch->active == 0) && batch->index) __flush_tlb_pending(batch); - batch->active = 0; preempt_enable(); }
--
2.40.1