Commit 3754137d authored by David Hildenbrand's avatar David Hildenbrand Committed by Andrew Morton
Browse files

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

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: 2c1f057e ("fs/proc/task_mmu: properly detect PM_MMAP_EXCLUSIVE per page of PMD-mapped THPs")
Signed-off-by: default avatarDavid Hildenbrand <david@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent cb0ca08b

fs/proc/task_mmu.c

+1 −1
Original line number Diff line number Diff line
@@ -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) &&