printk/cache: mark printk_once test variable __read_mostly
Add #include <linux/cache.h> to define __read_mostly.
Convert cache.h to use uapi/linux/kernel.h instead
of linux/kernel.h to avoid recursive #includes.
Convert the ALIGN macro to __ALIGN_KERNEL.
printk_once only sets the bool variable tested
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@perches.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 6949258..cc6f74d 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -5,6 +5,7 @@
#include <linux/init.h>
#include <linux/kern_levels.h>
#include <linux/linkage.h>
+#include <linux/cache.h>
extern const char linux_banner[];
extern const char linux_proc_banner[];
@@ -253,17 +254,17 @@
*/
#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