On 2023/3/5 3:52, Andrew Morton wrote:

The patch titled Subject: mm/damon/paddr: fix folio_nr_pages() after folio_put() in damon_pa_mark_accessed_or_deactivate() has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-damon-paddr-fix-folio_nr_pages-after-folio_put-in-damon_pa_mark_accessed_or_deactivate.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

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: SeongJae Park sj@kernel.org Subject: mm/damon/paddr: fix folio_nr_pages() after folio_put() in damon_pa_mark_accessed_or_deactivate() Date: Sat, 4 Mar 2023 19:39:49 +0000

damon_pa_mark_accessed_or_deactivate() is accessing a folio via folio_nr_pages() after folio_put() for the folio has invoked. Fix it.

Link: https://lkml.kernel.org/r/20230304193949.296391-3-sj@kernel.org Fixes: f70da5ee8fe1 ("mm/damon: convert damon_pa_mark_accessed_or_deactivate() to use folios")

This is accepted in v6.3-rc1,

Signed-off-by: SeongJae Park sj@kernel.org Cc: Kefeng Wang wangkefeng.wang@huawei.com Cc: Matthew Wilcox willy@infradead.org Cc: Vishal Moola (Oracle) vishal.moola@gmail.com Cc: stable@vger.kernel.org [6.2.x]

so no need to stable ?

Signed-off-by: Andrew Morton akpm@linux-foundation.org

--- a/mm/damon/paddr.c~mm-damon-paddr-fix-folio_nr_pages-after-folio_put-in-damon_pa_mark_accessed_or_deactivate +++ a/mm/damon/paddr.c @@ -280,8 +280,8 @@ static inline unsigned long damon_pa_mar folio_mark_accessed(folio); else folio_deactivate(folio);

• folio_put(folio);
  

  applied += folio_nr_pages(folio);

• folio_put(folio);
  

  } return applied * PAGE_SIZE; }

_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-paddr-fix-folio_size-call-after-folio_put-in-damon_pa_young.patch mm-damon-paddr-fix-folio_nr_pages-after-folio_put-in-damon_pa_mark_accessed_or_deactivate.patch