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powerpc/pseries: Avoid harmless preempt warning
author
Nicholas Piggin
<npiggin@gmail.com>
Fri, 20 Mar 2020 15:24:36 +0000
(
01:24
+1000)
committer
Michael Ellerman
<mpe@ellerman.id.au>
Wed, 25 Mar 2020 01:09:39 +0000
(12:09 +1100)
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link:
https://lore.kernel.org/r/20200320152436.1468651-1-npiggin@gmail.com
arch/powerpc/platforms/pseries/lpar.c
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diff --git
a/arch/powerpc/platforms/pseries/lpar.c
b/arch/powerpc/platforms/pseries/lpar.c
index
3c3da25
..
e4ed531
100644
(file)
--- a/
arch/powerpc/platforms/pseries/lpar.c
+++ b/
arch/powerpc/platforms/pseries/lpar.c
@@
-636,8
+636,16
@@
static const struct proc_ops vcpudispatch_stats_freq_proc_ops = {
static int __init vcpudispatch_stats_procfs_init(void)
{
- if (!lppaca_shared_proc(get_lppaca()))
+ /*
+ * Avoid smp_processor_id while preemptible. All CPUs should have
+ * the same value for lppaca_shared_proc.
+ */
+ preempt_disable();
+ if (!lppaca_shared_proc(get_lppaca())) {
+ preempt_enable();
return 0;
+ }
+ preempt_enable();
if (!proc_create("powerpc/vcpudispatch_stats", 0600, NULL,
&vcpudispatch_stats_proc_ops))