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 Pyt/ARLs mI341QtYpSk9JzTczDmUcy2IxmGgW6xWTbZu8/lvf/CCXwiY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 1/11/24 11:16 AM, Sidhartha Kumar wrote: > has_extra_refcount() makes the assumption that a ref count of 1 means > the page is not referenced by other users. Commit a08c7193e4f1 > (mm/filemap: remove hugetlb special casing in filemap.c) modifies > __filemap_add_folio() by calling folio_ref_add(folio, nr); for all cases > (including hugtetlb) where nr is the number of pages in the folio. We > should check if the page is not referenced by other users by checking > the page count against the number of pages rather than 1. > > In hugetlbfs_read_iter(), folio_test_has_hwpoisoned() is testing the wrong > flag as, in the hugetlb case, memory-failure code calls > folio_test_set_hwpoison() to indicate poison. folio_test_hwpoison() is the > correct function to test for that flag. > > After these fixes, the hugetlb hwpoison read selftest passes all cases. > > Fixes: a08c7193e4f1 ("mm/filemap: remove hugetlb special casing in filemap.c") > Closes: https://lore.kernel.org/linux-mm/20230713001833.3778937-1-jiaqiyan@google.com/T/#m8e1469119e5b831bbd05d495f96b842e4a1c5519 > Cc: # 6.7+ > Signed-off-by: Sidhartha Kumar > Reported-by: Muhammad Usama Anjum > Tested-by: Muhammad Usama Anjum > --- > fs/hugetlbfs/inode.c | 2 +- > mm/memory-failure.c | 2 +- > 2 files changed, 2 insertions(+), 2 deletions(-) > > diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c > index 36132c9125f9..3a248e4f7e93 100644 > --- a/fs/hugetlbfs/inode.c > +++ b/fs/hugetlbfs/inode.c > @@ -340,7 +340,7 @@ static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to) > } else { > folio_unlock(folio); > > - if (!folio_test_has_hwpoisoned(folio)) > + if (!folio_test_hwpoison(folio)) > want = nr; > else { > /* > diff --git a/mm/memory-failure.c b/mm/memory-failure.c > index d8c853b35dbb..87f6bf7d8bc1 100644 > --- a/mm/memory-failure.c > +++ b/mm/memory-failure.c > @@ -973,7 +973,7 @@ struct page_state { > static bool has_extra_refcount(struct page_state *ps, struct page *p, > bool extra_pins) > { > - int count = page_count(p) - 1; > + int count = page_count(p) - folio_nr_pages(page_folio(p)); > > if (extra_pins) > count -= 1; the patch title is missing a fs/hugetlbfs: prefix, could this be added Andrew? Thanks, Sidhartha