linux-kernel - [PATCH v2 40/45] powerpc, irq: Use GFP_ATOMIC allocations in atomic context

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Message-ID: <20130625203310.16593.6214.stgit@srivatsabhat.in.ibm.com>
Date:	Wed, 26 Jun 2013 02:03:11 +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
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,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Paul Mackerras <paulus@...ba.org>,
	Ian Munsie <imunsie@....ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH v2 40/45] powerpc,
 irq: Use GFP_ATOMIC allocations in atomic context

The function migrate_irqs() is called with interrupts disabled
and hence its not safe to do GFP_KERNEL allocations inside it,
because they can sleep. So change the gfp mask to GFP_ATOMIC.

Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Michael Ellerman <michael@...erman.id.au>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Ian Munsie <imunsie@....ibm.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Michael Ellerman <michael@...erman.id.au>
Cc: Li Zhong <zhong@...ux.vnet.ibm.com>
Cc: linuxppc-dev@...ts.ozlabs.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 arch/powerpc/kernel/irq.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index ea185e0..ca39bac 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -412,7 +412,7 @@ void migrate_irqs(void)
 	cpumask_var_t mask;
 	const struct cpumask *map = cpu_online_mask;
 
-	alloc_cpumask_var(&mask, GFP_KERNEL);
+	alloc_cpumask_var(&mask, GFP_ATOMIC);
 
 	for_each_irq_desc(irq, desc) {
 		struct irq_data *data;

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