[PATCH] printk: Mark printk_once test variable __read_mostly

[Joe Perches]

It's only set once so mark it __read_mostly.

Neaten the alignment so it matches the rest of the
pr_<level>_once #defines too.

Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
---
 include/linux/printk.h | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/include/linux/printk.h b/include/linux/printk.h
index e6131a78..abd42dd 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -251,17 +251,17 @@ extern asmlinkage void dump_stack(void) __cold;
  */
 
 #ifdef CONFIG_PRINTK
-#define printk_once(fmt, ...)			\
-({						\
-	static bool __print_once;		\
-						\
-	if (!__print_once) {			\
-		__print_once = true;		\
-		printk(fmt, ##__VA_ARGS__);	\
-	}					\
+#define printk_once(fmt, ...)					\
+({								\
+	static bool __print_once __read_mostly;			\
+								\
+	if (!__print_once) {					\
+		__print_once = true;				\
+		printk(fmt, ##__VA_ARGS__);			\
+	}							\
 })
 #else
-#define printk_once(fmt, ...)			\
+#define printk_once(fmt, ...)					\
 	no_printk(fmt, ##__VA_ARGS__)
 #endif
 


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