linux-kernel - [PATCH] mm/madvise: don't forget to leave lazy MMU mode in madvise_cold_or_pageout_pte

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Date: Fri, 26 Jan 2024 12:25:48 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jiexun Wang <wangjiexun@...ylab.org>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCH] mm/madvise: don't forget to leave lazy MMU mode in madvise_cold_or_pageout_pte_range()

We need to leave lazy MMU mode before unlocking.

Fixes: b2f557a21bc8 ("mm/madvise: add cond_resched() in madvise_cold_or_pageout_pte_range()")
Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
---
 mm/madvise.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/madvise.c b/mm/madvise.c
index 0f222d464254..127f0c7b69ac 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -451,6 +451,7 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd,
 		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;
-- 
2.43.0.429.g432eaa2c6b-goog