The patch titled
Subject: mm/madvise: don't forget to leave lazy MMU mode in madvise_cold_or_pageout_pte_range()
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-madvise-dont-forget-to-leave-lazy-mmu-mode-in-madvise_cold_or_pageout_pte_range.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-madvise-dont-forget-to-leave-lazy-mmu-mode-in-madvise_cold_or_pageout_pte_range.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Subject: mm/madvise: don't forget to leave lazy MMU mode in madvise_cold_or_pageout_pte_range()
Date: Fri, 26 Jan 2024 12:25:48 +0900
We need to leave lazy MMU mode before unlocking.
Link: https://lkml.kernel.org/r/20240126032608.355899-1-senozhatsky@xxxxxxxxxxxx
Fixes: b2f557a21bc8 ("mm/madvise: add cond_resched() in madvise_cold_or_pageout_pte_range()")
Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: Jiexun Wang <wangjiexun@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/madvise.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/madvise.c~mm-madvise-dont-forget-to-leave-lazy-mmu-mode-in-madvise_cold_or_pageout_pte_range
+++ a/mm/madvise.c
@@ -429,6 +429,7 @@ restart:
if (++batch_count == SWAP_CLUSTER_MAX) {
batch_count = 0;
if (need_resched()) {
+ arch_leave_lazy_mmu_mode();
pte_unmap_unlock(start_pte, ptl);
cond_resched();
goto restart;
_
Patches currently in -mm which might be from senozhatsky@xxxxxxxxxxxx are
mm-madvise-dont-forget-to-leave-lazy-mmu-mode-in-madvise_cold_or_pageout_pte_range.patch
