+ mm-madvise-add-mf_action_required-to-madvisemadv_hwpoison.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/madvise: add MF_ACTION_REQUIRED to madvise(MADV_HWPOISON)
has been added to the -mm mm-unstable branch.  Its filename is
     mm-madvise-add-mf_action_required-to-madvisemadv_hwpoison.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-madvise-add-mf_action_required-to-madvisemadv_hwpoison.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Jane Chu <jane.chu@oracle.com>
Subject: mm/madvise: add MF_ACTION_REQUIRED to madvise(MADV_HWPOISON)
Date: Fri, 24 May 2024 15:53:03 -0600

The soft hwpoison injector via madvise(MADV_HWPOISON) operates in a
synchrous way in a sense, the injector is also a process under test, and
should it have the poisoned page mapped in its address space, it should
get killed as much as in a real UE situation.  Doing so align with what
the madvise(2) man page says: " "This operation may result in the calling
process receiving a SIGBUS and the page being unmapped."

Link: https://lkml.kernel.org/r/20240524215306.2705454-3-jane.chu@oracle.com
Signed-off-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Oscar Salvador <oalvador@suse.de>
Acked-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/madvise.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/madvise.c~mm-madvise-add-mf_action_required-to-madvisemadv_hwpoison
+++ a/mm/madvise.c
@@ -1147,7 +1147,7 @@ static int madvise_inject_error(int beha
 		} else {
 			pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n",
 				 pfn, start);
-			ret = memory_failure(pfn, MF_COUNT_INCREASED | MF_SW_SIMULATED);
+			ret = memory_failure(pfn, MF_ACTION_REQUIRED | MF_COUNT_INCREASED | MF_SW_SIMULATED);
 			if (ret == -EOPNOTSUPP)
 				ret = 0;
 		}
_

Patches currently in -mm which might be from jane.chu@oracle.com are

mm-memory-failure-try-to-send-sigbus-even-if-unmap-failed.patch
mm-madvise-add-mf_action_required-to-madvisemadv_hwpoison.patch
mm-memory-failure-improve-memory-failure-action_result-messages.patch
mm-memory-failure-move-hwpoison_filter-higher-up.patch
mm-memory-failure-send-sigbus-in-the-event-of-thp-split-fail.patch