Re: [PATCH] mm/huge_memory: replace VM_NO_THP VM_BUG_ON with actual VMA check

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On 04/02/2016 05:37 PM, Konstantin Khlebnikov wrote:
Khugepaged detects own VMAs by checking vm_file and vm_ops but this
way it cannot distinguish private /dev/zero mappings from other special
mappings like /dev/hpet which has no vm_ops and popultes PTEs in mmap.

This fixes false-positive VM_BUG_ON and prevents installing THP where
they are not expected.

Signed-off-by: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/CACT4Y+ZmuZMV5CjSFOeXviwQdABAgT7T+StKfTqan9YDtgEi5g@xxxxxxxxxxxxxx
Fixes: 78f11a255749 ("mm: thp: fix /dev/zero MAP_PRIVATE and vm_flags cleanups")
Cc: stable <stable@xxxxxxxxxxxxxxx>

Acked-by: Vlastimil Babka <vbabka@xxxxxxx>

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