linux-kernel - [PATCH powerpc 2/2] powerpc: mask smp_processor

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Message-Id: <1297375047-18608-2-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Thu, 10 Feb 2011 13:57:27 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	benh@...nel.crashing.org, paulus@...ba.org
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH powerpc 2/2] powerpc: mask smp_processor_id() false positive

The rtas_event_scan() function uses smp_processor_id() to select a
starting point in cpu_online_mask, and does so under the protection
of get_online_cpus().  This might not select the current processor
in any case, so switch to raw_smp_processor_id().

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 arch/powerpc/kernel/rtasd.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/kernel/rtasd.c b/arch/powerpc/kernel/rtasd.c
index 049dbec..7980ec0 100644
--- a/arch/powerpc/kernel/rtasd.c
+++ b/arch/powerpc/kernel/rtasd.c
@@ -412,7 +412,8 @@ static void rtas_event_scan(struct work_struct *w)
 
 	get_online_cpus();
 
-	cpu = cpumask_next(smp_processor_id(), cpu_online_mask);
+	/* raw_ OK because just using CPU as starting point. */
+	cpu = cpumask_next(raw_smp_processor_id(), cpu_online_mask);
         if (cpu >= nr_cpu_ids) {
 		cpu = cpumask_first(cpu_online_mask);
 
-- 
1.7.3.2

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