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| author | David Hildenbrand <david@redhat.com> | 2025-06-17 16:35:32 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-06 11:01:39 +0200 |
| commit | 93abf5e0d584bb53b43db54e37434647040cf5f1 (patch) | |
| tree | 260711460908a7fc1ade416277b63785ac3e783e /fs/proc | |
| parent | f855b119e62b004a5044ed565f2a2b368c4d3f16 (diff) | |
| download | linux-93abf5e0d584bb53b43db54e37434647040cf5f1.tar.gz linux-93abf5e0d584bb53b43db54e37434647040cf5f1.tar.bz2 linux-93abf5e0d584bb53b43db54e37434647040cf5f1.zip | |
fs/proc/task_mmu: fix PAGE_IS_PFNZERO detection for the huge zero folio
commit 4a5e85f4eb8fd18b1266342d100e4f0849544ca0 upstream.
is_zero_pfn() does not work for the huge zero folio. Fix it by using
is_huge_zero_pmd().
This can cause the PAGEMAP_SCAN ioctl against /proc/pid/pagemap to
present pages as PAGE_IS_PRESENT rather than as PAGE_IS_PFNZERO.
Found by code inspection.
Link: https://lkml.kernel.org/r/20250617143532.2375383-1-david@redhat.com
Fixes: 52526ca7fdb9 ("fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs")
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/task_mmu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 536b7dc45381..96fe904b2ac5 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -2155,7 +2155,7 @@ static unsigned long pagemap_thp_category(struct pagemap_scan_private *p, categories |= PAGE_IS_FILE; } - if (is_zero_pfn(pmd_pfn(pmd))) + if (is_huge_zero_pmd(pmd)) categories |= PAGE_IS_PFNZERO; if (pmd_soft_dirty(pmd)) categories |= PAGE_IS_SOFT_DIRTY; |