malhuda/msm-4.14
1
0
Fork 0
mirror of https://github.com/rd-stuffs/msm-4.14.git synced 2025-02-20 11:45:48 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

smp: Process pending softirqs in flush_smp_call_function_from_idle()

Browse Source 
send_call_function_single_ipi() may wake an idle CPU without sending an
IPI. The woken up CPU will process the SMP-functions in
flush_smp_call_function_from_idle(). Any raised softirq from within the
SMP-function call will not be processed.
Should the CPU have no tasks assigned, then it will go back to idle with
pending softirqs and the NOHZ will rightfully complain.

Process pending softirqs on return from flush_smp_call_function_queue().

Fixes: b2a02fc43a1f4 ("smp: Optimize send_call_function_single_ipi()")
Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210123201027.3262800-2-bigeasy@linutronix.de
Signed-off-by: Zlatan Radovanovic <zlatan.radovanovic@fet.ba>
Signed-off-by: azrim <mirzaspc@gmail.com>
This commit is contained in:
Sebastian Andrzej Siewior 2021-01-23 21:10:25 +01:00 committed by azrim
parent ed90e6b932
commit 72171d6517
No known key found for this signature in database
GPG Key ID: 497F8FB059B45D1C
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/smp.c
View File

@ -13,6 +13,7 @@
#include <linux/export.h>
#include <linux/percpu.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/gfp.h>
#include <linux/smp.h>
#include <linux/cpu.h>
@ -273,6 +274,9 @@ void flush_smp_call_function_from_idle(void)
local_irq_save(flags);
flush_smp_call_function_queue(true);
if (local_softirq_pending())
do_softirq();
local_irq_restore(flags);
}