linux-kernel - [PATCH 3/4] IRQ,IA64: remove redundant memory copy operations in chip->irq_set

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Date:	Mon,  2 Apr 2012 00:33:51 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Jiang Liu <jiang.liu@...wei.com>, Jiang Liu <liuj97@...il.com>,
	Keping Chen <chenkeping@...wei.com>,
	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
	linux-altix@....com
Subject: [PATCH 3/4] IRQ,IA64: remove redundant memory copy operations in chip->irq_set_affinity()

Changeset 3b8249e7 has introduced standard return value IRQ_SET_MASK_OK(0) and
IRQ_SET_MASK_OK_NOCOPY(1) for interrupt controller chip's set_irq_affinity()
method. If chip->irq_set_affinity() doesn't change the affinity mask passed in,
it should return IRQ_SET_MASK_OK and the core logic will copy the affinity
mask to irq_data->affinity field.

Several xxx_irq_set_affinity() methods for IA64 platforms still return
0(IRQ_SET_MASK_OK) after copying the affinity mask to irq_data->affinity field,
so remove the redundant memory copy operations.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
---
 arch/ia64/kernel/msi_ia64.c  |    2 --
 arch/ia64/sn/kernel/msi_sn.c |    1 -
 2 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
index fb2f1e6..05f5dc6 100644
--- a/arch/ia64/kernel/msi_ia64.c
+++ b/arch/ia64/kernel/msi_ia64.c
@@ -39,7 +39,6 @@ static int ia64_set_msi_irq_affinity(struct irq_data *idata,
 	msg.data = data;
 
 	write_msi_msg(irq, &msg);
-	cpumask_copy(idata->affinity, cpumask_of(cpu));
 
 	return 0;
 }
@@ -155,7 +154,6 @@ static int dmar_msi_set_affinity(struct irq_data *data,
 	msg.address_lo |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
 
 	dmar_msi_write(irq, &msg);
-	cpumask_copy(data->affinity, mask);
 
 	return 0;
 }
diff --git a/arch/ia64/sn/kernel/msi_sn.c b/arch/ia64/sn/kernel/msi_sn.c
index 2b98b9e..a033fc9 100644
--- a/arch/ia64/sn/kernel/msi_sn.c
+++ b/arch/ia64/sn/kernel/msi_sn.c
@@ -206,7 +206,6 @@ static int sn_set_msi_irq_affinity(struct irq_data *data,
 	msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);
 
 	write_msi_msg(irq, &msg);
-	cpumask_copy(data->affinity, cpu_mask);
 
 	return 0;
 }
-- 
1.7.5.4

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