mm/madvise.c has the brief description about all MADV_ flags, added the description for the newly added MADV_WIPEONFORK and MADV_KEEPONFORK.
Although man page has the similar information, but it'd better to keep the consistency with other flags. Signed-off-by: Yang Shi <yan...@alibaba-inc.com> --- mm/madvise.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/madvise.c b/mm/madvise.c index 21261ff..c6bf572 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -749,6 +749,9 @@ static int madvise_inject_error(int behavior, * MADV_DONTFORK - omit this area from child's address space when forking: * typically, to avoid COWing pages pinned by get_user_pages(). * MADV_DOFORK - cancel MADV_DONTFORK: no longer omit this area when forking. + * MADV_WIPEONFORK - present the child process with zero-filled memory in this + * range after a fork. + * MADV_KEEPONFORK - undo the effect of MADV_WIPEONFORK * MADV_HWPOISON - trigger memory error handler as if the given memory range * were corrupted by unrecoverable hardware memory failure. * MADV_SOFT_OFFLINE - try to soft-offline the given range of memory. @@ -769,7 +772,9 @@ static int madvise_inject_error(int behavior, * zero - success * -EINVAL - start + len < 0, start is not page-aligned, * "behavior" is not a valid value, or application - * is attempting to release locked or shared pages. + * is attempting to release locked or shared pages, + * or the specified address range includes file, Huge TLB, + * MAP_SHARED or VMPFNMAP range. * -ENOMEM - addresses in the specified range are not currently * mapped, or are outside the AS of the process. * -EIO - an I/O error occurred while paging in data. -- 1.8.3.1
