On Tue, Oct 15, 2013 at 02:00:05PM -0700, Joe Perches wrote:
> 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.
Which overhead?
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