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printk/cache: mark printk_once test variable __read_mostly

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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>
This commit is contained in:
Joe Perches 2014-01-23 15:54:16 -08:00 committed by Linus Torvalds
parent 8f073bd0d0
commit c28aa1f0a8
3 changed files with 13 additions and 11 deletions
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1
arch/ia64/include/asm/processor.h
View file

@ -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>

4
include/linux/cache.h
View file

@ -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

19
include/linux/printk.h
View file

@ -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