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Message-ID: <20130627195801.29830.77286.stgit@srivatsabhat.in.ibm.com>
Date: Fri, 28 Jun 2013 01:28:01 +0530
From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To: tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
oleg@...hat.com, paulmck@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
mingo@...nel.org, akpm@...ux-foundation.org, namhyung@...nel.org,
walken@...gle.com, vincent.guittot@...aro.org,
laijs@...fujitsu.com, David.Laight@...lab.com
Cc: rostedt@...dmis.org, wangyun@...ux.vnet.ibm.com,
xiaoguangrong@...ux.vnet.ibm.com, sbw@....edu, fweisbec@...il.com,
zhong@...ux.vnet.ibm.com, nikunj@...ux.vnet.ibm.com,
srivatsa.bhat@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
Mike Frysinger <vapier@...too.org>,
Bob Liu <lliubbo@...il.com>, Steven Miao <realmz6@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
uclinux-dist-devel@...ckfin.uclinux.org,
"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH v3 32/45] blackfin/smp: Use get/put_online_cpus_atomic() to
prevent CPU offline
Once stop_machine() is gone from the CPU offline path, we won't be able
to depend on disabling preemption to prevent CPUs from going offline
from under us.
Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going
offline, while invoking from atomic context.
Cc: Mike Frysinger <vapier@...too.org>
Cc: Bob Liu <lliubbo@...il.com>
Cc: Steven Miao <realmz6@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: uclinux-dist-devel@...ckfin.uclinux.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---
arch/blackfin/mach-common/smp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index 1bc2ce6..11496cd 100644
--- a/arch/blackfin/mach-common/smp.c
+++ b/arch/blackfin/mach-common/smp.c
@@ -238,13 +238,13 @@ void smp_send_stop(void)
{
cpumask_t callmap;
- preempt_disable();
+ get_online_cpus_atomic();
cpumask_copy(&callmap, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), &callmap);
if (!cpumask_empty(&callmap))
send_ipi(&callmap, BFIN_IPI_CPU_STOP);
- preempt_enable();
+ put_online_cpus_atomic();
return;
}
--
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