[patch 18/18] sched: Enable smp_processor_id() checks early

Thomas Gleixner
2017-05-14T18:38:28Z

[-- Attachment #1: sched--Enable-smp_processor_id---checks-early.patch --]
[-- Type: text/plain, Size: 1164 bytes --]

smp_processor_id() checks are enabled after the boot process is done. That
hides bugs in the smp bringup and driver initialization code.

Enable it right before the first non-boot CPU is brought up.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
init/main.c | 3 +++
lib/smp_processor_id.c | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
init/main.c | 3 +++
lib/smp_processor_id.c | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)

--- a/init/main.c
+++ b/init/main.c
@@ -1025,6 +1025,9 @@ static noinline void __init kernel_init_
*/
set_cpus_allowed_ptr(current, cpumask_of(raw_smp_processor_id()));

+ /* Enable smp_processor_id() checks */
+ system_state = SYSTEM_BOOTING_SMP;
+
cad_pid = task_pid(current);

smp_prepare_cpus(setup_max_cpus);
--- a/lib/smp_processor_id.c
+++ b/lib/smp_processor_id.c
@@ -28,7 +28,7 @@ notrace static unsigned int check_preemp
/*
* It is valid to assume CPU-locality during early bootup:
*/
- if (system_state != SYSTEM_RUNNING)
+ if (system_state < SYSTEM_BOOTING_SMP)
goto out;

/*