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Commit c224815d authored by John Stultz's avatar John Stultz Committed by Linus Torvalds
Browse files

printk: Add printk_deferred_once 



Two of the three prink_deferred uses are really printk_once style
uses, so add a printk_deferred_once macro to simplify those call
sites.

Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Reviewed-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent aac74dc4

include/linux/printk.h

+11 −0
Original line number Diff line number Diff line
@@ -266,9 +266,20 @@ extern asmlinkage void dump_stack(void) __cold; 
		printk(fmt, ##__VA_ARGS__);			\

	}							\

})

#define printk_deferred_once(fmt, ...)				\

({								\

	static bool __print_once __read_mostly;			\

								\

	if (!__print_once) {					\

		__print_once = true;				\

		printk_deferred(fmt, ##__VA_ARGS__);		\

	}							\

})

#else

#define printk_once(fmt, ...)					\

	no_printk(fmt, ##__VA_ARGS__)

#define printk_deferred_once(fmt, ...)				\

	no_printk(fmt, ##__VA_ARGS__)

#endif



#define pr_emerg_once(fmt, ...)					\

kernel/sched/deadline.c

+1 −6
Original line number Diff line number Diff line
@@ -348,12 +348,7 @@ static void replenish_dl_entity(struct sched_dl_entity *dl_se, 
	 * entity.

	 */

	if (dl_time_before(dl_se->deadline, rq_clock(rq))) {

		static bool lag_once = false;



		if (!lag_once) {

			lag_once = true;

			printk_deferred("sched: DL replenish lagged to much\n");

		}

		printk_deferred_once("sched: DL replenish lagged to much\n");

		dl_se->deadline = rq_clock(rq) + pi_se->dl_deadline;

		dl_se->runtime = pi_se->dl_runtime;

	}

kernel/sched/rt.c

+1 −7
Original line number Diff line number Diff line
@@ -890,14 +890,8 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq) 
		 * but accrue some time due to boosting.

		 */

		if (likely(rt_b->rt_runtime)) {

			static bool once = false;



			rt_rq->rt_throttled = 1;



			if (!once) {

				once = true;

				printk_deferred("sched: RT throttling activated\n");

			}

			printk_deferred_once("sched: RT throttling activated\n");

		} else {

			/*

			 * In case we did anyway, make it go away,