On Tue, 2013-10-15 at 22:50 +0200, Frederic Weisbecker wrote:
[]
> diff --git a/include/linux/printk.h b/include/linux/printk.h
[]
> @@ -252,14 +253,7 @@ 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__); \
> - } \
> -})
> + DO_ONCE(printk(fmt, ##__VA_ARGS__));
It's hard to believe the overhead is worth it.
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