On 01/25/21 12:04, John Ogness wrote: > On 2021-01-25, Peter Zijlstra <pet...@infradead.org> wrote: > > On Sat, Jan 23, 2021 at 11:37:40PM +0000, Qais Yousef wrote: > >> To allow users in code where printk is not allowed. > >> > >> Signed-off-by: Qais Yousef <qais.you...@arm.com> > >> --- > >> include/linux/printk.h | 24 ++++++++++++++++++++++++ > >> 1 file changed, 24 insertions(+) > >> > >> diff --git a/include/linux/printk.h b/include/linux/printk.h > >> index fe7eb2351610..92c0978c7b44 100644 > >> --- a/include/linux/printk.h > >> +++ b/include/linux/printk.h > >> @@ -480,21 +480,45 @@ extern int kptr_restrict; > >> printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) > >> /* no pr_cont_once, don't do that... */ > >> > >> +#define pr_emerg_deferred_once(fmt, ...) \ > >> + printk_deferred_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) > >> +#define pr_alert_deferred_once(fmt, ...) \ > >> + printk_deferred_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) > >> +#define pr_crit_deferred_once(fmt, ...) > >> \ > >> + printk_deferred_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) > >> +#define pr_err_deferred_once(fmt, ...) > >> \ > >> + printk_deferred_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) > >> +#define pr_warn_deferred_once(fmt, ...) > >> \ > >> + printk_deferred_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) > >> +#define pr_notice_deferred_once(fmt, ...) \ > >> + printk_deferred_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) > >> +#define pr_info_deferred_once(fmt, ...) > >> \ > >> + printk_deferred_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) > >> +/* no pr_cont_deferred_once, don't do that... */ > > > > I absolutely detest this.. the whole _deferred thing is an > > abomination. > > And it will disappear at some point. > > > We should be very close to printk not needing this anymore, printk > > people? > > It will disappear once console printing threads are introduced. We > probably still have a few kernel releases until we see that. First we > need to finish merging full lockless access, remove the safe buffers, > and merge the atomic consoles.
Okay. As I said in the cover letter, I didn't think the addition of these new macros looked like a win overall. I will drop this patch and just open code the use of printk_deferred_once() in hrtimer_interrupt(). Which should be easier to fix later when it should disappear. Thanks -- Qais Yousef