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fs/proc/task_mmu: fix pagemap flags with PMD THP entries on 32bit

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Entries (including flags) are u64, even on 32bit.  So right now we are
cutting of the flags on 32bit.  This way, for example the cow selftest
complains about:

  # ./cow
  ...
  Bail Out! read and ioctl return unmatched results for populated: 0 1

Link: https://lkml.kernel.org/r/20241217195000.1734039-1-david@redhat.com
Fixes: 2c1f057e5be6 ("fs/proc/task_mmu: properly detect PM_MMAP_EXCLUSIVE per page of PMD-mapped THPs")
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2024-12-17 20:50:00 +01:00 committed by Andrew Morton
parent cb0ca08b32
commit 3754137d26
1 changed files with 1 additions and 1 deletions
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2
fs/proc/task_mmu.c
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@ -1810,7 +1810,7 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
}
for (; addr != end; addr += PAGE_SIZE, idx++) {
unsigned long cur_flags = flags;
u64 cur_flags = flags;
pagemap_entry_t pme;
if (folio && (flags & PM_PRESENT) &&