From 6bdb913f0a70a4dfb7f066fb15e2d6f960701d00 Mon Sep 17 00:00:00 2001 From: Haggai Eran Date: Mon, 8 Oct 2012 16:33:35 -0700 Subject: mm: wrap calls to set_pte_at_notify with invalidate_range_start and invalidate_range_end In order to allow sleeping during invalidate_page mmu notifier calls, we need to avoid calling when holding the PT lock. In addition to its direct calls, invalidate_page can also be called as a substitute for a change_pte call, in case the notifier client hasn't implemented change_pte. This patch drops the invalidate_page call from change_pte, and instead wraps all calls to change_pte with invalidate_range_start and invalidate_range_end calls. Note that change_pte still cannot sleep after this patch, and that clients implementing change_pte should not take action on it in case the number of outstanding invalidate_range_start calls is larger than one, otherwise they might miss a later invalidation. Signed-off-by: Haggai Eran Cc: Andrea Arcangeli Cc: Sagi Grimberg Cc: Peter Zijlstra Cc: Xiao Guangrong Cc: Or Gerlitz Cc: Haggai Eran Cc: Shachar Raindel Cc: Liran Liss Cc: Christoph Lameter Cc: Avi Kivity Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/mmu_notifier.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'mm/mmu_notifier.c') diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index c297142f0fe6..479a1e751a73 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -137,12 +137,6 @@ void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address, hlist_for_each_entry_rcu(mn, n, &mm->mmu_notifier_mm->list, hlist) { if (mn->ops->change_pte) mn->ops->change_pte(mn, mm, address, pte); - /* - * Some drivers don't have change_pte, - * so we must call invalidate_page in that case. - */ - else if (mn->ops->invalidate_page) - mn->ops->invalidate_page(mn, mm, address); } srcu_read_unlock(&srcu, id); } -- cgit v1.2.3-55-g7522