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>

3 files changed, 13 insertions, 11 deletions

diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h
index 5a84b3a50741..efd1b927ccb7 100644
--- a/arch/ia64/include/asm/processor.h
+++ b/arch/ia64/include/asm/processor.h
@@ -71,6 +71,7 @@
 #include <linux/compiler.h>
 #include <linux/threads.h>
 #include <linux/types.h>
+#include <linux/bitops.h>
 
 #include <asm/fpu.h>
 #include <asm/page.h>
diff --git a/include/linux/cache.h b/include/linux/cache.h
index 4c570653ab84..17e7e82d2aa7 100644
--- a/include/linux/cache.h
+++ b/include/linux/cache.h
@@ -1,11 +1,11 @@
 #ifndef __LINUX_CACHE_H
 #define __LINUX_CACHE_H
 
-#include <linux/kernel.h>
+#include <uapi/linux/kernel.h>
 #include <asm/cache.h>
 
 #ifndef L1_CACHE_ALIGN
-#define L1_CACHE_ALIGN(x) ALIGN(x, L1_CACHE_BYTES)
+#define L1_CACHE_ALIGN(x) __ALIGN_KERNEL(x, L1_CACHE_BYTES)
 #endif
 
 #ifndef SMP_CACHE_BYTES
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 694925837a16..cc6f74d65167 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 @@ 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