linux-kernel - [PATCH v2 3/3] IRQ,IA64: normalize return value of chip->irq_set

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Date:	Fri, 30 Mar 2012 00:44:53 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Greg KH <greg@...ah.com>, Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>
Cc:	Jiang Liu <jiang.liu@...wei.com>, Jes Sorensen <jes@....com>,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-altix@....com, Jiang Liu <liuj97@...il.com>,
	Keping Chen <chenkeping@...wei.com>
Subject: [PATCH v2 3/3] IRQ,IA64: normalize return value of chip->irq_set_affinity() method

On IA64 platforms, interrupt controller chip's irq_set_affinity() method
always copies affinity mask to irq_data->affinity field but still returns
0(IRQ_SET_MASK_OK). That return value causes the interrupt core logic
unnecessarily copies the mask to irq_data->affinity field again.
So return IRQ_SET_MASK_OK_NOCOPY instead of IRQ_SET_MASK_OK to get rid of
the duplicated copy operation.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
---
 arch/ia64/kernel/iosapic.c   |    4 +++-
 arch/ia64/kernel/msi_ia64.c  |    4 ++--
 arch/ia64/sn/kernel/irq.c    |    2 +-
 arch/ia64/sn/kernel/msi_sn.c |    2 +-
 4 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index ef4b5d8..47a4d1e 100644
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -373,8 +373,10 @@ iosapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 		iosapic_write(iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
 	}
 
+	return IRQ_SET_MASK_OK_NOCOPY;
+#else
+	return IRQ_SET_MASK_OK;
 #endif
-	return 0;
 }
 
 /*
diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
index fb2f1e6..ca66c6a 100644
--- a/arch/ia64/kernel/msi_ia64.c
+++ b/arch/ia64/kernel/msi_ia64.c
@@ -41,7 +41,7 @@ static int ia64_set_msi_irq_affinity(struct irq_data *idata,
 	write_msi_msg(irq, &msg);
 	cpumask_copy(idata->affinity, cpumask_of(cpu));
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 #endif /* CONFIG_SMP */
 
@@ -157,7 +157,7 @@ static int dmar_msi_set_affinity(struct irq_data *data,
 	dmar_msi_write(irq, &msg);
 	cpumask_copy(data->affinity, mask);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 #endif /* CONFIG_SMP */
 
diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c
index 62cf4dd..aa58931 100644
--- a/arch/ia64/sn/kernel/irq.c
+++ b/arch/ia64/sn/kernel/irq.c
@@ -216,7 +216,7 @@ static int sn_set_affinity_irq(struct irq_data *data,
 				 sn_irq_lh[irq], list)
 		(void)sn_retarget_vector(sn_irq_info, nasid, slice);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 #ifdef CONFIG_SMP
diff --git a/arch/ia64/sn/kernel/msi_sn.c b/arch/ia64/sn/kernel/msi_sn.c
index 2b98b9e..ebb5b55 100644
--- a/arch/ia64/sn/kernel/msi_sn.c
+++ b/arch/ia64/sn/kernel/msi_sn.c
@@ -208,7 +208,7 @@ static int sn_set_msi_irq_affinity(struct irq_data *data,
 	write_msi_msg(irq, &msg);
 	cpumask_copy(data->affinity, cpu_mask);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 #endif /* CONFIG_SMP */
 
-- 
1.7.5.4

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