linux-kernel - [PATCH v4 2/5] mm/madvise: Add MF_ACTION_REQUIRED to madvise(MADV

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Message-Id: <20240524215306.2705454-3-jane.chu@oracle.com>
Date: Fri, 24 May 2024 15:53:03 -0600
From: Jane Chu <jane.chu@...cle.com>
To: linmiaohe@...wei.com, nao.horiguchi@...il.com, akpm@...ux-foundation.org,
        osalvador@...e.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/5] mm/madvise: Add MF_ACTION_REQUIRED to madvise(MADV_HWPOISON)

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."

Signed-off-by: Jane Chu <jane.chu@...cle.com>
Reviewed-by: Oscar Salvador <oalvador@...e.de>
Acked-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/madvise.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index c8ba3f3eb54d..d8a01d7b2860 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1147,7 +1147,7 @@ static int madvise_inject_error(int behavior,
 		} 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;
 		}
-- 
2.39.3