linux-kernel - [PATCHv2 1/2] sched/wait: Add wait_event_state

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Message-ID: <20250610045321.4030262-1-senozhatsky@chromium.org>
Date: Tue, 10 Jun 2025 13:52:28 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Miklos Szeredi <miklos@...redi.hu>,
	Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Tomasz Figa <tfiga@...omium.org>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCHv2 1/2] sched/wait: Add wait_event_state_exclusive()

Allows exclusive waits with a custom @state.

Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
---

v2: switched to wait_event_state_exclusive()

 include/linux/wait.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/wait.h b/include/linux/wait.h
index 327894f022cf..9ebb0d2e422a 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -968,6 +968,18 @@ extern int do_wait_intr_irq(wait_queue_head_t *, wait_queue_entry_t *);
 		      state, 0, timeout,					\
 		      __ret = schedule_timeout(__ret))
 
+#define __wait_event_state_exclusive(wq, condition, state)			\
+	___wait_event(wq, condition, state, 1, 0, schedule())
+
+#define wait_event_state_exclusive(wq, condition, state)			\
+({										\
+	int __ret = 0;								\
+	might_sleep();								\
+	if (!(condition))							\
+		__ret = __wait_event_state_exclusive(wq, condition, state);	\
+	__ret;									\
+})
+
 #define __wait_event_killable_timeout(wq_head, condition, timeout)		\
 	___wait_event(wq_head, ___wait_cond_timeout(condition),			\
 		      TASK_KILLABLE, 0, timeout,				\
-- 
2.50.0.rc1.591.g9c95f17f64-goog