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Message-ID: <20130218124305.26245.64570.stgit@srivatsabhat.in.ibm.com>
Date: Mon, 18 Feb 2013 18:13:06 +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
Cc: rostedt@...dmis.org, wangyun@...ux.vnet.ibm.com,
xiaoguangrong@...ux.vnet.ibm.com, rjw@...k.pl, sbw@....edu,
fweisbec@...il.com, linux@....linux.org.uk,
nikunj@...ux.vnet.ibm.com, srivatsa.bhat@...ux.vnet.ibm.com,
linux-pm@...r.kernel.org, linux-arch@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
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walken@...gle.com, vincent.guittot@...aro.org
Subject: [PATCH v6 34/46] hexagon/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 preempt_disable() or local_irq_disable() 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@...eaurora.org>
Cc: linux-hexagon@...r.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---
arch/hexagon/kernel/smp.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/hexagon/kernel/smp.c b/arch/hexagon/kernel/smp.c
index 8e095df..ec87de9 100644
--- a/arch/hexagon/kernel/smp.c
+++ b/arch/hexagon/kernel/smp.c
@@ -112,6 +112,7 @@ void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
unsigned long cpu;
unsigned long retval;
+ get_online_cpus_atomic();
local_irq_save(flags);
for_each_cpu(cpu, cpumask) {
@@ -128,6 +129,7 @@ void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
}
local_irq_restore(flags);
+ put_online_cpus_atomic();
}
static struct irqaction ipi_intdesc = {
@@ -241,9 +243,12 @@ 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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