linux-kernel - [tip: sched/core] smp: Move irq_work_run() out of flush_smp_call_function

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Message-ID: <159100514066.17951.11705563695792334781.tip-bot2@tip-bot2>
Date:   Mon, 01 Jun 2020 09:52:20 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: sched/core] smp: Move irq_work_run() out of
 flush_smp_call_function_queue()

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     afaa653c564da38c0b34c4baba31e88c46a8764c
Gitweb:        https://git.kernel.org/tip/afaa653c564da38c0b34c4baba31e88c46a8764c
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 26 May 2020 18:11:00 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Thu, 28 May 2020 10:54:15 +02:00

smp: Move irq_work_run() out of flush_smp_call_function_queue()

This ensures flush_smp_call_function_queue() is strictly about
call_single_queue.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20200526161907.895109676@infradead.org
---
 kernel/smp.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index db2f738..f720e38 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -84,6 +84,7 @@ int smpcfd_dying_cpu(unsigned int cpu)
 	 * still pending.
 	 */
 	flush_smp_call_function_queue(false);
+	irq_work_run();
 	return 0;
 }
 
@@ -191,6 +192,14 @@ static int generic_exec_single(int cpu, call_single_data_t *csd,
 void generic_smp_call_function_single_interrupt(void)
 {
 	flush_smp_call_function_queue(true);
+
+	/*
+	 * Handle irq works queued remotely by irq_work_queue_on().
+	 * Smp functions above are typically synchronous so they
+	 * better run first since some other CPUs may be busy waiting
+	 * for them.
+	 */
+	irq_work_run();
 }
 
 /**
@@ -267,14 +276,6 @@ static void flush_smp_call_function_queue(bool warn_cpu_offline)
 		csd_unlock(csd);
 		func(info);
 	}
-
-	/*
-	 * Handle irq works queued remotely by irq_work_queue_on().
-	 * Smp functions above are typically synchronous so they
-	 * better run first since some other CPUs may be busy waiting
-	 * for them.
-	 */
-	irq_work_run();
 }
 
 /*