Messages in this thread Patch in this message |  | | | From | Joerg Roedel <> | | Subject | [PATCH 1/3] mm: Disable tlb_fast_mode() when mm has notifiers | | Date | Fri, 21 Oct 2011 14:21:46 +0200 |
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When the MMU-Notifiers are used to manage non-CPU TLBs the tlb_fast_mode can't be used anymore. So disable it when an mm has notifiers.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> --- include/asm-generic/tlb.h | 2 +- include/linux/mmu_notifier.h | 1 + mm/memory.c | 2 +- 3 files changed, 3 insertions(+), 2 deletions(-) diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h index e58fa77..8c6cc1b 100644 --- a/include/asm-generic/tlb.h +++ b/include/asm-generic/tlb.h @@ -100,7 +100,7 @@ struct mmu_gather { static inline int tlb_fast_mode(struct mmu_gather *tlb) { -#ifdef CONFIG_SMP +#if defined(CONFIG_SMP) || defined(CONFIG_MMU_NOTIFIER) return tlb->fast_mode; #else /* diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 1d1b1e1..b9469d6 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -373,6 +373,7 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm) #define pmdp_clear_flush_notify pmdp_clear_flush #define pmdp_splitting_flush_notify pmdp_splitting_flush #define set_pte_at_notify set_pte_at +#define mm_has_notifiers(mm) 0 #endif /* CONFIG_MMU_NOTIFIER */ diff --git a/mm/memory.c b/mm/memory.c index a56e3ba..b31f9e0 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -230,7 +230,7 @@ void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, bool fullmm) tlb->fullmm = fullmm; tlb->need_flush = 0; - tlb->fast_mode = (num_possible_cpus() == 1); + tlb->fast_mode = (num_possible_cpus() == 1) && !mm_has_notifiers(mm); tlb->local.next = NULL; tlb->local.nr = 0; tlb->local.max = ARRAY_SIZE(tlb->__pages); -- 1.7.5.4
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