[PATCH v2 1/3] mm/memory-failure: report MF_MSG_KERNEL for reserved pages

[Breno Leitao <leitao@debian.org>]

When get_hwpoison_page() returns a negative value, distinguish
reserved pages from other failure cases by reporting MF_MSG_KERNEL
instead of MF_MSG_GET_HWPOISON. Reserved pages belong to the kernel
and should be classified accordingly for proper handling by the
panic_on_unrecoverable_memory_failure mechanism.

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 mm/memory-failure.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index ee42d4361309..6ff80e01b91a 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2432,7 +2432,11 @@ int memory_failure(unsigned long pfn, int flags)
 		}
 		goto unlock_mutex;
 	} else if (res < 0) {
-		res = action_result(pfn, MF_MSG_GET_HWPOISON, MF_IGNORED);
+		if (PageReserved(p))
+			res = action_result(pfn, MF_MSG_KERNEL, MF_IGNORED);
+		else
+			res = action_result(pfn, MF_MSG_GET_HWPOISON,
+					    MF_IGNORED);
 		goto unlock_mutex;
 	}
 

-- 
2.52.0