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Subject[PATCH] memory-failure: fix section mismatch
Clang complains when a variable is declared extern twice, but with two
different sections. num_poisoned_pages is marked extern and __read_mostly
in include/linux/swapops.h, but only extern in include/linux/mm.h. Some
c source files must include both, and thus see the conflicting

Signed-off-by: Nick Desaulniers <>
include/linux/mm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ad06d42adb1a..bd4bd59f02c1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2582,7 +2582,7 @@ extern int get_hwpoison_page(struct page *page);
extern int sysctl_memory_failure_early_kill;
extern int sysctl_memory_failure_recovery;
extern void shake_page(struct page *p, int access);
-extern atomic_long_t num_poisoned_pages;
+extern atomic_long_t num_poisoned_pages __read_mostly;
extern int soft_offline_page(struct page *page, int flags);

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