Messages in this thread Patch in this message | | | From | Borislav Petkov <> | Subject | [PATCH 2/3] printk: Make the printk*once() variants return a value | Date | Fri, 24 Jun 2016 10:30:19 +0200 |
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From: Borislav Petkov <bp@suse.de>
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> --- include/linux/printk.h | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/include/linux/printk.h b/include/linux/printk.h index f4da695fd615..464fcdddb359 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__); \ } \ + __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__); \ } \ + __ret_print_once; \ }) #else #define printk_once(fmt, ...) \ -- 2.8.4
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