hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

printk: Make the printk*once() variants return a value 

Have printk*once() return a bool which denotes whether the string was
printed or not so that calling code can react accordingly.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1467671487-10344-3-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Borislav Petkov 2016-07-05 00:31:26 +02:00 committed by Ingo Molnar
parent ef16dd0c2a
commit 069f0cd00d
1 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
include/linux/printk.h
View File

@ -108,11 +108,14 @@ struct va_format {
* Dummy printk for disabled debugging statements to use whilst maintaining * Dummy printk for disabled debugging statements to use whilst maintaining
* gcc's format checking. * gcc's format checking.
*/ */
#define no_printk(fmt, ...) \ #define no_printk(fmt, ...) \
do { \ ({ \
if (0) \ do { \
printk(fmt, ##__VA_ARGS__); \ if (0) \
} while (0) printk(fmt, ##__VA_ARGS__); \
} while (0); \
0; \
})
#ifdef CONFIG_EARLY_PRINTK #ifdef CONFIG_EARLY_PRINTK
extern asmlinkage __printf(1, 2) extern asmlinkage __printf(1, 2)
@ -309,20 +312,24 @@ extern asmlinkage void dump_stack(void) __cold;
#define printk_once(fmt, ...) \ #define printk_once(fmt, ...) \
({ \ ({ \
static bool __print_once __read_mostly; \ static bool __print_once __read_mostly; \
bool __ret_print_once = !__print_once; \
\ \
if (!__print_once) { \ if (!__print_once) { \
__print_once = true; \ __print_once = true; \
printk(fmt, ##__VA_ARGS__); \ printk(fmt, ##__VA_ARGS__); \
} \ } \
unlikely(__ret_print_once); \
}) })
#define printk_deferred_once(fmt, ...) \ #define printk_deferred_once(fmt, ...) \
({ \ ({ \
static bool __print_once __read_mostly; \ static bool __print_once __read_mostly; \
bool __ret_print_once = !__print_once; \
\ \
if (!__print_once) { \ if (!__print_once) { \
__print_once = true; \ __print_once = true; \
printk_deferred(fmt, ##__VA_ARGS__); \ printk_deferred(fmt, ##__VA_ARGS__); \
} \ } \
unlikely(__ret_print_once); \
}) })
#else #else
#define printk_once(fmt, ...) \ #define printk_once(fmt, ...) \