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authorPeter Zijlstra <peterz@infradead.org>2020-09-17 11:38:30 +0300
committerPeter Zijlstra <peterz@infradead.org>2020-11-10 20:38:59 +0300
commitaf449901b84c98cbd84a0113223ba3bcfcb12a26 (patch)
tree0580fcc4d04ef7ebaa77a658cba36203668c3e44 /lib/smp_processor_id.c
parent9cfc3e18adb0362533e911bf3ce6ec8c821cfccc (diff)
downloadlinux-af449901b84c98cbd84a0113223ba3bcfcb12a26.tar.xz
sched: Add migrate_disable()
Add the base migrate_disable() support (under protest). While migrate_disable() is (currently) required for PREEMPT_RT, it is also one of the biggest flaws in the system. Notably this is just the base implementation, it is broken vs sched_setaffinity() and hotplug, both solved in additional patches for ease of review. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Valentin Schneider <valentin.schneider@arm.com> Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com> Link: https://lkml.kernel.org/r/20201023102346.818170844@infradead.org
Diffstat (limited to 'lib/smp_processor_id.c')
-rw-r--r--lib/smp_processor_id.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c
index 525222e4f409..faaa927ac2c8 100644
--- a/lib/smp_processor_id.c
+++ b/lib/smp_processor_id.c
@@ -26,6 +26,11 @@ unsigned int check_preemption_disabled(const char *what1, const char *what2)
if (current->nr_cpus_allowed == 1)
goto out;
+#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT)
+ if (current->migration_disabled)
+ goto out;
+#endif
+
/*
* It is valid to assume CPU-locality during early bootup:
*/