From: David Hildenbrand david@redhat.com
mainline inclusion from mainline-v6.8-rc3 commit e4e3df290f65da6cb27dac1309389c916f27db1a category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I9CESE CVE: NA
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The correct folio replacement for "set_page_dirty()" is "folio_mark_dirty()", not "folio_set_dirty()". Using the latter won't properly inform the FS using the dirty_folio() callback.
This has been found by code inspection, but likely this can result in some real trouble when zapping dirty PTEs that point at clean pagecache folios.
Yuezhang Mo said: "Without this fix, testing the latest exfat with xfstests, test cases generic/029 and generic/030 will fail."
Link: https://lkml.kernel.org/r/20240122171751.272074-1-david@redhat.com Fixes: c46265030b0f ("mm/memory: page_remove_rmap() -> folio_remove_rmap_pte()") Signed-off-by: David Hildenbrand david@redhat.com Reported-by: Ryan Roberts ryan.roberts@arm.com Closes: https://lkml.kernel.org/r/2445cedb-61fb-422c-8bfb-caf0a2beed62@arm.com Reviewed-by: Ryan Roberts ryan.roberts@arm.com Cc: Matthew Wilcox (Oracle) willy@infradead.org Reviewed-by: Yuezhang Mo Yuezhang.Mo@sony.com Signed-off-by: Andrew Morton akpm@linux-foundation.org (cherry picked from commit e4e3df290f65da6cb27dac1309389c916f27db1a) Signed-off-by: Kefeng Wang wangkefeng.wang@huawei.com --- mm/memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memory.c b/mm/memory.c index 6755d8addbb3..031ff37a91fb 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1465,7 +1465,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, delay_rmap = 0; if (!folio_test_anon(folio)) { if (pte_dirty(ptent)) { - folio_set_dirty(folio); + folio_mark_dirty(folio); if (tlb_delay_rmap(tlb)) { delay_rmap = 1; force_flush = 1;