From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH] powerpc/pseries: avoid harmless preempt warning
Date: Sat, 21 Mar 2020 01:24:36 +1000 [thread overview]
Message-ID: <20200320152436.1468651-1-npiggin@gmail.com> (raw)
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/platforms/pseries/lpar.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 3c3da25b445c..e4ed5317f117 100644
--- 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))
--
2.23.0
next reply other threads:[~2020-03-20 15:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-20 15:24 Nicholas Piggin [this message]
2020-03-20 15:33 ` [PATCH] powerpc/pseries: avoid harmless preempt warning Christophe Leroy
2020-03-21 6:34 ` Nicholas Piggin
2020-03-26 12:06 ` Michael Ellerman
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