The patch titled
Subject: mm/madvise.c: add description for MADV_WIPEONFORK and MADV_KEEPONFORK
has been added to the -mm tree. Its filename is
mm-madvise-add-description-for-madv_wipeonfork-and-madv_keeponfork.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-madvise-add-description-for-madv_wipeonfork-and-madv_keeponfork.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-madvise-add-description-for-madv_wipeonfork-and-madv_keeponfork.patch
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------------------------------------------------------
From: "Yang Shi" <yang.s@xxxxxxxxxxxxxxx>
Subject: mm/madvise.c: add description for MADV_WIPEONFORK and MADV_KEEPONFORK
mm/madvise.c has a brief description about all MADV_ flags. Add a
description for the newly added MADV_WIPEONFORK and MADV_KEEPONFORK.
Although man page has the similar information, but it'd better to keep the
consistent with other flags.
Link: http://lkml.kernel.org/r/1506117328-88228-1-git-send-email-yang.s@xxxxxxxxxxxxxxx
Signed-off-by: Yang Shi <yang.s@xxxxxxxxxxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/madvise.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN mm/madvise.c~mm-madvise-add-description-for-madv_wipeonfork-and-madv_keeponfork mm/madvise.c
--- a/mm/madvise.c~mm-madvise-add-description-for-madv_wipeonfork-and-madv_keeponfork
+++ a/mm/madvise.c
@@ -757,6 +757,9 @@ madvise_behavior_valid(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.
@@ -777,7 +780,9 @@ madvise_behavior_valid(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.
_
Patches currently in -mm which might be from yang.s@xxxxxxxxxxxxxxx are
mm-madvise-add-description-for-madv_wipeonfork-and-madv_keeponfork.patch
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