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    mm: remove bogus warning in copy_huge_pmd() · d0319bd5
    Mel Gorman 提交于
    Sasha Levin reported the following warning being triggered
    
      WARNING: CPU: 28 PID: 35287 at mm/huge_memory.c:887 copy_huge_pmd+0x145/ 0x3a0()
      Call Trace:
        copy_huge_pmd+0x145/0x3a0
        copy_page_range+0x3f2/0x560
        dup_mmap+0x2c9/0x3d0
        dup_mm+0xad/0x150
        copy_process+0xa68/0x12e0
        do_fork+0x96/0x270
        SyS_clone+0x16/0x20
        stub_clone+0x69/0x90
    
    This warning was introduced by "mm: numa: Avoid unnecessary disruption
    of NUMA hinting during migration" for paranoia reasons but the warning
    is bogus.  I was thinking of parallel races between NUMA hinting faults
    and forks but this warning would also be triggered by a parallel reclaim
    splitting a THP during a fork.  Remote the bogus warning.
    Signed-off-by: NMel Gorman <mgorman@suse.de>
    Reported-by: NSasha Levin <sasha.levin@oracle.com>
    Cc: Alex Thorlton <athorlton@sgi.com>
    Cc: Rik van Riel <riel@redhat.com>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    d0319bd5
huge_memory.c 77.5 KB