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    Subject[PATCH 01/35] mm: add unlikely to the mm allocation failure check
    Date
    Very minor optimization to hint gcc.

    Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
    ---
    kernel/fork.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/kernel/fork.c b/kernel/fork.c
    index 47b4e4f..98db8b0 100644
    --- a/kernel/fork.c
    +++ b/kernel/fork.c
    @@ -571,7 +571,7 @@ struct mm_struct *mm_alloc(void)
    struct mm_struct *mm;

    mm = allocate_mm();
    - if (!mm)
    + if (unlikely(!mm))
    return NULL;

    memset(mm, 0, sizeof(*mm));

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