diff options
| author |   Borislav Petkov <bp@suse.de> | 2016-07-05 00:31:26 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2016-07-08 11:33:18 +0200 |
| commit | 069f0cd00df0abfb9252e0dbdc355e40e6ab75fc (patch) | |
| tree | a86d2acab5de6d9eb06c9325e883ec8f75d00ef2 /include/linux/printk.h | |
| parent | x86/dumpstack: Honor supplied @regs arg (diff) | |
| download | linux-dev-069f0cd00df0abfb9252e0dbdc355e40e6ab75fc.tar.xz linux-dev-069f0cd00df0abfb9252e0dbdc355e40e6ab75fc.zip | |
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>
Diffstat (limited to 'include/linux/printk.h')
| -rw-r--r-- | include/linux/printk.h | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/include/linux/printk.h b/include/linux/printk.h index f4da695fd615..f136b22c7772 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -108,11 +108,14 @@ struct va_format { * Dummy printk for disabled debugging statements to use whilst maintaining * gcc's format checking. */ -#define no_printk(fmt, ...) \ -do { \ - if (0) \ - printk(fmt, ##__VA_ARGS__); \ -} while (0) +#define no_printk(fmt, ...) \ +({ \ + do { \ + if (0) \ + printk(fmt, ##__VA_ARGS__); \ + } while (0); \ + 0; \ +}) #ifdef CONFIG_EARLY_PRINTK extern asmlinkage __printf(1, 2) @@ -309,20 +312,24 @@ extern asmlinkage void dump_stack(void) __cold; #define printk_once(fmt, ...) \ ({ \ static bool __print_once __read_mostly; \ + bool __ret_print_once = !__print_once; \ \ if (!__print_once) { \ __print_once = true; \ printk(fmt, ##__VA_ARGS__); \ } \ + unlikely(__ret_print_once); \ }) #define printk_deferred_once(fmt, ...) \ ({ \ static bool __print_once __read_mostly; \ + bool __ret_print_once = !__print_once; \ \ if (!__print_once) { \ __print_once = true; \ printk_deferred(fmt, ##__VA_ARGS__); \ } \ + unlikely(__ret_print_once); \ }) #else #define printk_once(fmt, ...) \ |