Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
mm: reinstante dropped pmd_trans_splitting() check
The check for a pmd being in the process of being split was dropped by
mistake by commit d10e63f29488 ("mm: numa: Create basic numa page
hinting infrastructure"). Put it back.
Reported-by: Dave Jones <davej@redhat.com>
Debugged-by: Hillf Danton <dhillf@gmail.com>
Acked-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Kirill Shutemov <kirill@shutemov.name>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+8
+8
mm/memory.c
+8
mm/memory.c
···
3711
3711
if (pmd_trans_huge(orig_pmd)) {
3712
3712
unsigned int dirty = flags & FAULT_FLAG_WRITE;
3713
3713
3714
+
/*
3715
+
* If the pmd is splitting, return and retry the
3716
+
* the fault. Alternative: wait until the split
3717
+
* is done, and goto retry.
3718
+
*/
3719
+
if (pmd_trans_splitting(orig_pmd))
3720
+
return 0;
3721
+
3714
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if (pmd_numa(orig_pmd))
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return do_huge_pmd_numa_page(mm, vma, address,
3716
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orig_pmd, pmd);