asgardius/android_kernel_motorola_sm6225
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

x86/mtrr: Remove get_online_cpus() from mtrr_save_state()

Browse source 
mtrr_save_state() is invoked from native_cpu_up() which is in the context
of a CPU hotplug operation and therefor calling get_online_cpus() is
pointless.

While this works in the current get_online_cpus() implementation it
prevents from converting the hotplug locking to percpu rwsems.

Remove it.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170524081547.651378834@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2017-05-24 10:15:19 +02:00 committed by Thomas Gleixner
parent c5a81c8ff8
commit 547efeadd4
1 changed files with 0 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/x86/kernel/cpu/mtrr/main.c
View file

@ -807,10 +807,8 @@ void mtrr_save_state(void)
if (!mtrr_enabled())
return;
get_online_cpus();
first_cpu = cpumask_first(cpu_online_mask);
smp_call_function_single(first_cpu, mtrr_save_fixed_ranges, NULL, 1);
put_online_cpus();
}
void set_mtrr_aps_delayed_init(void)