commit 5844a486daf2705dcdbfabe869a698bdfe629f54
author Guenter Roeck <linux@roeck-us.net> Thu Apr 05 16:24:32 2018 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Thu Apr 05 21:36:26 2018 -0700
tree a56d36d9b1fd551cd4ad7b242bbbee3c626e7bdd
parent c1d53b92b95c23909de11a97bcc51f26a9509231

include/linux/mm.h: provide consistent declaration for num_poisoned_pages

clang reports the following compile warning.

  In file included from mm/vmscan.c:56:
  ./include/linux/swapops.h:327:22: warning:
	section attribute is specified on redeclared variable [-Wsection]
  extern atomic_long_t num_poisoned_pages __read_mostly;
                       ^
  ./include/linux/mm.h:2585:22: note: previous declaration is here
  extern atomic_long_t num_poisoned_pages;
                     ^

Let's use __read_mostly everywhere.

Link: http://lkml.kernel.org/r/1519686565-8224-1-git-send-email-linux@roeck-us.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7c06581..40fca1b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2592,7 +2592,7 @@ 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);