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authorluofei <luofei@unicloud.com>2022-03-23 00:44:38 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-23 01:57:07 +0300
commitd1fe111fb62a1cf0446a2919f5effbb33ad0702c (patch)
tree6574928df84f4ec14b01945db7c003748bf092a0 /mm/hwpoison-inject.c
parenta581865ecd0a5a0b8464d6f1e668ae6681c1572f (diff)
downloadlinux-d1fe111fb62a1cf0446a2919f5effbb33ad0702c.tar.xz
mm/hwpoison: avoid the impact of hwpoison_filter() return value on mce handler
When the hwpoison page meets the filter conditions, it should not be regarded as successful memory_failure() processing for mce handler, but should return a distinct value, otherwise mce handler regards the error page has been identified and isolated, which may lead to calling set_mce_nospec() to change page attribute, etc. Here memory_failure() return -EOPNOTSUPP to indicate that the error event is filtered, mce handler should not take any action for this situation and hwpoison injector should treat as correct. Link: https://lkml.kernel.org/r/20220223082135.2769649-1-luofei@unicloud.com Signed-off-by: luofei <luofei@unicloud.com> Acked-by: Borislav Petkov <bp@suse.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Naoya Horiguchi <naoya.horiguchi@nec.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hwpoison-inject.c')
-rw-r--r--mm/hwpoison-inject.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
index f74552977649..bb0cea5468cb 100644
--- a/mm/hwpoison-inject.c
+++ b/mm/hwpoison-inject.c
@@ -48,7 +48,8 @@ static int hwpoison_inject(void *data, u64 val)
inject:
pr_info("Injecting memory failure at pfn %#lx\n", pfn);
- return memory_failure(pfn, 0);
+ err = memory_failure(pfn, 0);
+ return (err == -EOPNOTSUPP) ? 0 : err;
}
static int hwpoison_unpoison(void *data, u64 val)