+ mm-madvise-pass-return-code-of-memory_failure-to-userspace.patch added to -mm tree

+ mm-madvise-pass-return-code-of-memory_failure-to-userspace.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm/madvise: pass return code of memory_failure() to userspace
has been added to the -mm tree.  Its filename is
     mm-madvise-pass-return-code-of-memory_failure-to-userspace.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-madvise-pass-return-code-of-memory_failure-to-userspace.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-madvise-pass-return-code-of-memory_failure-to-userspace.patch

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------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Subject: mm/madvise: pass return code of memory_failure() to userspace

Currently the return value of memory_failure() is not passed to userspace
when madvise(MADV_HWPOISON) is used.  This is inconvenient for test
programs that want to know the result of error handling.  So let's return
it to the caller as we already do in the MADV_SOFT_OFFLINE case.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/madvise.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff -puN mm/madvise.c~mm-madvise-pass-return-code-of-memory_failure-to-userspace mm/madvise.c
--- a/mm/madvise.c~mm-madvise-pass-return-code-of-memory_failure-to-userspace
+++ a/mm/madvise.c
@@ -555,8 +555,9 @@ static int madvise_hwpoison(int bhv, uns
 		}
 		pr_info("Injecting memory failure for page %#lx at %#lx\n",
 		       page_to_pfn(p), start);
-		/* Ignore return value for now */
-		memory_failure(page_to_pfn(p), 0, MF_COUNT_INCREASED);
+		ret = memory_failure(page_to_pfn(p), 0, MF_COUNT_INCREASED);
+		if (ret)
+			return ret;
 	}
 	return 0;
 }
_

Patches currently in -mm which might be from n-horiguchi@ah.jp.nec.com are

mm-madvise-pass-return-code-of-memory_failure-to-userspace.patch