* + mm-thp-fix-page_address_in_vma-on-file-thp-tails.patch added to -mm tree
@ 2021-06-10 22:24 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2021-06-10 22:24 UTC (permalink / raw
To: apopple, hughd, jack, juew, kirill.shutemov, linmiaohe, minchan,
mm-commits, naoya.horiguchi, osalvador, peterx, rcampbell,
shakeelb, shy828301, stable, wangyugui, willy, ziy
The patch titled
Subject: mm/thp: fix page_address_in_vma() on file THP tails
has been added to the -mm tree. Its filename is
mm-thp-fix-page_address_in_vma-on-file-thp-tails.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-thp-fix-page_address_in_vma-on-file-thp-tails.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-thp-fix-page_address_in_vma-on-file-thp-tails.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
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------------------------------------------------------
From: Jue Wang <juew@google.com>
Subject: mm/thp: fix page_address_in_vma() on file THP tails
Anon THP tails were already supported, but memory-failure may need to use
page_address_in_vma() on file THP tails, which its page->mapping check did
not permit: fix it.
hughd adds: no current usage is known to hit the issue, but this does fix
a subtle trap in a general helper: best fixed in stable sooner than later.
Link: https://lkml.kernel.org/r/a0d9b53-bf5d-8bab-ac5-759dc61819c1@google.com
Fixes: 800d8c63b2e9 ("shmem: add huge pages support")
Signed-off-by: Jue Wang <juew@google.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: <stable@vger.kernel.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Wang Yugui <wangyugui@e16-tech.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/rmap.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/mm/rmap.c~mm-thp-fix-page_address_in_vma-on-file-thp-tails
+++ a/mm/rmap.c
@@ -716,11 +716,11 @@ unsigned long page_address_in_vma(struct
if (!vma->anon_vma || !page__anon_vma ||
vma->anon_vma->root != page__anon_vma->root)
return -EFAULT;
- } else if (page->mapping) {
- if (!vma->vm_file || vma->vm_file->f_mapping != page->mapping)
- return -EFAULT;
- } else
+ } else if (!vma->vm_file) {
+ return -EFAULT;
+ } else if (vma->vm_file->f_mapping != compound_head(page)->mapping) {
return -EFAULT;
+ }
return vma_address(page, vma);
}
_
Patches currently in -mm which might be from juew@google.com are
mm-thp-fix-page_address_in_vma-on-file-thp-tails.patch
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2021-06-10 22:24 + mm-thp-fix-page_address_in_vma-on-file-thp-tails.patch added to -mm tree akpm
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