* [PATCH v2 34/45] hexagon/smp: Use get/put_online_cpus_atomic() to prevent CPU offline
[not found] <20130625202452.16593.22810.stgit@srivatsabhat.in.ibm.com>
@ 2013-06-25 20:32 ` Srivatsa S. Bhat
0 siblings, 0 replies; only message in thread
From: Srivatsa S. Bhat @ 2013-06-25 20:32 UTC (permalink / raw)
To: tglx, peterz, tj, oleg, paulmck, rusty, mingo, akpm, namhyung,
walken, vincent.guittot, laijs
Cc: rostedt, wangyun, xiaoguangrong, sbw, fweisbec, zhong, nikunj,
srivatsa.bhat, linux-pm, linux-arch, linuxppc-dev, netdev,
linux-kernel, Richard Kuo, Thomas Gleixner, linux-hexagon,
Srivatsa S. Bhat
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: Richard Kuo <rkuo@codeaurora.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-hexagon@vger.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
---
arch/hexagon/kernel/smp.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/hexagon/kernel/smp.c b/arch/hexagon/kernel/smp.c
index 0e364ca..30d4318 100644
--- a/arch/hexagon/kernel/smp.c
+++ b/arch/hexagon/kernel/smp.c
@@ -241,9 +241,12 @@ void smp_send_reschedule(int cpu)
void smp_send_stop(void)
{
struct cpumask targets;
+
+ get_online_cpus_atomic();
cpumask_copy(&targets, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), &targets);
send_ipi(&targets, IPI_CPU_STOP);
+ put_online_cpus_atomic();
}
void arch_send_call_function_single_ipi(int cpu)
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2013-06-25 20:32 ` [PATCH v2 34/45] hexagon/smp: Use get/put_online_cpus_atomic() to prevent CPU offline Srivatsa S. Bhat
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