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    Subject[PATCH v3 4/4] exec: document acct_arg_size()
    Add the comment to explain acct_arg_size().

    Signed-off-by: Oleg Nesterov <oleg@redhat.com>
    ---

    fs/exec.c | 7 ++++++-
    1 file changed, 6 insertions(+), 1 deletion(-)

    --- 38/fs/exec.c~4_doc_acct_arg_size 2011-03-02 16:21:57.000000000 +0100
    +++ 38/fs/exec.c 2011-03-02 16:27:24.000000000 +0100
    @@ -164,7 +164,12 @@ out:
    }

    #ifdef CONFIG_MMU
    -
    +/*
    + * The nascent bprm->mm is not visible until exec_mmap() but it can
    + * use a lot of memory, account these pages in current->mm temporary
    + * for oom_badness()->get_mm_rss(). Once exec succeeds or fails, we
    + * change the counter back via acct_arg_size(0).
    + */
    static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
    {
    struct mm_struct *mm = current->mm;


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