[PATCH v3 0/4] normalize return value of chip->irq_set_affinity()

[PATCH v3 0/4] normalize return value of chip->irq_set_affinity()

[Jiang Liu]

On x86 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.

This patch also fixes a minor bug in irq_move_masked_irq(), which treats
return value IRQ_SET_MASK_OK_NOCOPY as error code.

v2/v3: split patches to only do one thing in a patch according to Thomas'
    suggestion

Jiang Liu (4):
  IRQ: correctly handle return value from chip->irq_set_affinity() in
    irq_move_masked_irq()
  IRQ: introduce irq_do_set_affinity() to reduce duplicated code
  IRQ,x86: normalize return value of chip->irq_set_affinity() method
  IRQ,IA64: normalize return value of chip->irq_set_affinity() method

 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 +-
 arch/x86/kernel/apic/io_apic.c |   11 ++++++-----
 arch/x86/platform/uv/uv_irq.c  |    2 +-
 kernel/irq/internals.h         |    3 +++
 kernel/irq/manage.c            |   39 ++++++++++++++++++++++-----------------
 kernel/irq/migration.c         |    6 +-----
 9 files changed, 40 insertions(+), 33 deletions(-)

-- 
1.7.5.4

[PATCH v3 1/4] IRQ: correctly handle return value from chip->irq_set_affinity() in irq_move_masked_irq()

[Jiang Liu]

chip->irq_set_affinity() may return IRQ_SET_MASK_OK_NOCOPY if the mask has
been copied to desc->irq_data.affinity, but irq_move_masked_irq() incorrectly
treats that return value as error code.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
---
 kernel/irq/migration.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 4742090..c3c8975 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -43,12 +43,16 @@ void irq_move_masked_irq(struct irq_data *idata)
 	 * masking the irqs.
 	 */
 	if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
-		   < nr_cpu_ids))
-		if (!chip->irq_set_affinity(&desc->irq_data,
-					    desc->pending_mask, false)) {
+		   < nr_cpu_ids)) {
+		int ret = chip->irq_set_affinity(&desc->irq_data,
+						 desc->pending_mask, false);
+		switch (ret) {
+		case IRQ_SET_MASK_OK:
 			cpumask_copy(desc->irq_data.affinity, desc->pending_mask);
+		case IRQ_SET_MASK_OK_NOCOPY:
 			irq_set_thread_affinity(desc);
 		}
+	}
 
 	cpumask_clear(desc->pending_mask);
 }
-- 
1.7.5.4

[tip:irq/core] genirq: Adjust irq thread affinity on IRQ_SET_MASK_OK_NOCOPY return value

[tip-bot for Jiang Liu]

Commit-ID:  f5cb92ac82d06cb583c1f66666314c5c0a4d7913
Gitweb:     http://git.kernel.org/tip/f5cb92ac82d06cb583c1f66666314c5c0a4d7913
Author:     Jiang Liu <liuj97@gmail.com>
AuthorDate: Fri, 30 Mar 2012 23:11:33 +0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Fri, 30 Mar 2012 23:13:46 +0200

genirq: Adjust irq thread affinity on IRQ_SET_MASK_OK_NOCOPY return value

irq_move_masked_irq() checks the return code of
chip->irq_set_affinity() only for 0, but IRQ_SET_MASK_OK_NOCOPY is
also a valid return code, which is there to avoid a redundant copy of
the cpumask. But in case of IRQ_SET_MASK_OK_NOCOPY we not only avoid
the redundant copy, we also fail to adjust the thread affinity of an
eventually threaded interrupt handler.

Handle IRQ_SET_MASK_OK (==0) and IRQ_SET_MASK_OK_NOCOPY(==1) return
values correctly by checking the valid return values seperately.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Keping Chen <chenkeping@huawei.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1333120296-13563-2-git-send-email-jiang.liu@huawei.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/irq/migration.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 4742090..c3c8975 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -43,12 +43,16 @@ void irq_move_masked_irq(struct irq_data *idata)
 	 * masking the irqs.
 	 */
 	if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
-		   < nr_cpu_ids))
-		if (!chip->irq_set_affinity(&desc->irq_data,
-					    desc->pending_mask, false)) {
+		   < nr_cpu_ids)) {
+		int ret = chip->irq_set_affinity(&desc->irq_data,
+						 desc->pending_mask, false);
+		switch (ret) {
+		case IRQ_SET_MASK_OK:
 			cpumask_copy(desc->irq_data.affinity, desc->pending_mask);
+		case IRQ_SET_MASK_OK_NOCOPY:
 			irq_set_thread_affinity(desc);
 		}
+	}
 
 	cpumask_clear(desc->pending_mask);
 }

[PATCH v3 2/4] IRQ: introduce irq_do_set_affinity() to reduce duplicated code

[Jiang Liu]

Introduce function irq_do_set_affinity() to reduce duplicated code.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
---
 kernel/irq/internals.h |    3 +++
 kernel/irq/manage.c    |   39 ++++++++++++++++++++++-----------------
 kernel/irq/migration.c |   12 ++----------
 3 files changed, 27 insertions(+), 27 deletions(-)

diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 8e5c56b..001fa5b 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -101,6 +101,9 @@ extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 
 extern void irq_set_thread_affinity(struct irq_desc *desc);
 
+extern int irq_do_set_affinity(struct irq_data *data,
+			       const struct cpumask *dest, bool force);
+
 /* Inline functions for support of irq chips on slow busses */
 static inline void chip_bus_lock(struct irq_desc *desc)
 {
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index b0ccd1a..d2724a0 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -139,6 +139,25 @@ static inline void
 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { }
 #endif
 
+int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
+			bool force)
+{
+	struct irq_desc *desc = irq_data_to_desc(data);
+	struct irq_chip *chip = irq_data_get_irq_chip(data);
+	int ret;
+
+	ret = chip->irq_set_affinity(data, mask, false);
+	switch (ret) {
+	case IRQ_SET_MASK_OK:
+		cpumask_copy(data->affinity, mask);
+	case IRQ_SET_MASK_OK_NOCOPY:
+		irq_set_thread_affinity(desc);
+		ret = 0;
+	}
+
+	return ret;
+}
+
 int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask)
 {
 	struct irq_chip *chip = irq_data_get_irq_chip(data);
@@ -149,14 +168,7 @@ int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask)
 		return -EINVAL;
 
 	if (irq_can_move_pcntxt(data)) {
-		ret = chip->irq_set_affinity(data, mask, false);
-		switch (ret) {
-		case IRQ_SET_MASK_OK:
-			cpumask_copy(data->affinity, mask);
-		case IRQ_SET_MASK_OK_NOCOPY:
-			irq_set_thread_affinity(desc);
-			ret = 0;
-		}
+		ret = irq_do_set_affinity(data, mask, false);
 	} else {
 		irqd_set_move_pending(data);
 		irq_copy_pending(desc, mask);
@@ -280,9 +292,7 @@ EXPORT_SYMBOL_GPL(irq_set_affinity_notifier);
 static int
 setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
 {
-	struct irq_chip *chip = irq_desc_get_chip(desc);
 	struct cpumask *set = irq_default_affinity;
-	int ret;
 
 	/* Excludes PER_CPU and NO_BALANCE interrupts */
 	if (!irq_can_set_affinity(irq))
@@ -301,13 +311,8 @@ setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
 	}
 
 	cpumask_and(mask, cpu_online_mask, set);
-	ret = chip->irq_set_affinity(&desc->irq_data, mask, false);
-	switch (ret) {
-	case IRQ_SET_MASK_OK:
-		cpumask_copy(desc->irq_data.affinity, mask);
-	case IRQ_SET_MASK_OK_NOCOPY:
-		irq_set_thread_affinity(desc);
-	}
+	irq_do_set_affinity(&desc->irq_data, mask, false);
+
 	return 0;
 }
 #else
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index c3c8975..ef04dab 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -43,16 +43,8 @@ void irq_move_masked_irq(struct irq_data *idata)
 	 * masking the irqs.
 	 */
 	if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
-		   < nr_cpu_ids)) {
-		int ret = chip->irq_set_affinity(&desc->irq_data,
-						 desc->pending_mask, false);
-		switch (ret) {
-		case IRQ_SET_MASK_OK:
-			cpumask_copy(desc->irq_data.affinity, desc->pending_mask);
-		case IRQ_SET_MASK_OK_NOCOPY:
-			irq_set_thread_affinity(desc);
-		}
-	}
+		   < nr_cpu_ids))
+		irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false);
 
 	cpumask_clear(desc->pending_mask);
 }
-- 
1.7.5.4

[tip:irq/core] genirq: Introduce irq_do_set_affinity() to reduce duplicated code

[tip-bot for Jiang Liu]

Commit-ID:  818b0f3bfb236ae66cac3ff38e86b9e47f24b7aa
Gitweb:     http://git.kernel.org/tip/818b0f3bfb236ae66cac3ff38e86b9e47f24b7aa
Author:     Jiang Liu <liuj97@gmail.com>
AuthorDate: Fri, 30 Mar 2012 23:11:34 +0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 24 May 2012 22:36:40 +0200

genirq: Introduce irq_do_set_affinity() to reduce duplicated code

All invocations of chip->irq_set_affinity() are doing the same return
value checks. Let them all use a common function.

[ tglx: removed the silly likely while at it ]

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Keping Chen <chenkeping@huawei.com>
Link: http://lkml.kernel.org/r/1333120296-13563-3-git-send-email-jiang.liu@huawei.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/irq/internals.h |    3 +++
 kernel/irq/manage.c    |   39 ++++++++++++++++++++++-----------------
 kernel/irq/migration.c |   13 ++-----------
 3 files changed, 27 insertions(+), 28 deletions(-)

diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 8e5c56b..001fa5b 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -101,6 +101,9 @@ extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 
 extern void irq_set_thread_affinity(struct irq_desc *desc);
 
+extern int irq_do_set_affinity(struct irq_data *data,
+			       const struct cpumask *dest, bool force);
+
 /* Inline functions for support of irq chips on slow busses */
 static inline void chip_bus_lock(struct irq_desc *desc)
 {
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index bb32326..a1b9033 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -139,6 +139,25 @@ static inline void
 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { }
 #endif
 
+int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
+			bool force)
+{
+	struct irq_desc *desc = irq_data_to_desc(data);
+	struct irq_chip *chip = irq_data_get_irq_chip(data);
+	int ret;
+
+	ret = chip->irq_set_affinity(data, mask, false);
+	switch (ret) {
+	case IRQ_SET_MASK_OK:
+		cpumask_copy(data->affinity, mask);
+	case IRQ_SET_MASK_OK_NOCOPY:
+		irq_set_thread_affinity(desc);
+		ret = 0;
+	}
+
+	return ret;
+}
+
 int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask)
 {
 	struct irq_chip *chip = irq_data_get_irq_chip(data);
@@ -149,14 +168,7 @@ int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask)
 		return -EINVAL;
 
 	if (irq_can_move_pcntxt(data)) {
-		ret = chip->irq_set_affinity(data, mask, false);
-		switch (ret) {
-		case IRQ_SET_MASK_OK:
-			cpumask_copy(data->affinity, mask);
-		case IRQ_SET_MASK_OK_NOCOPY:
-			irq_set_thread_affinity(desc);
-			ret = 0;
-		}
+		ret = irq_do_set_affinity(data, mask, false);
 	} else {
 		irqd_set_move_pending(data);
 		irq_copy_pending(desc, mask);
@@ -280,9 +292,8 @@ EXPORT_SYMBOL_GPL(irq_set_affinity_notifier);
 static int
 setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
 {
-	struct irq_chip *chip = irq_desc_get_chip(desc);
 	struct cpumask *set = irq_default_affinity;
-	int ret, node = desc->irq_data.node;
+	int node = desc->irq_data.node;
 
 	/* Excludes PER_CPU and NO_BALANCE interrupts */
 	if (!irq_can_set_affinity(irq))
@@ -308,13 +319,7 @@ setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
 		if (cpumask_intersects(mask, nodemask))
 			cpumask_and(mask, mask, nodemask);
 	}
-	ret = chip->irq_set_affinity(&desc->irq_data, mask, false);
-	switch (ret) {
-	case IRQ_SET_MASK_OK:
-		cpumask_copy(desc->irq_data.affinity, mask);
-	case IRQ_SET_MASK_OK_NOCOPY:
-		irq_set_thread_affinity(desc);
-	}
+	irq_do_set_affinity(&desc->irq_data, mask, false);
 	return 0;
 }
 #else
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index c3c8975..ca3f4aa 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -42,17 +42,8 @@ void irq_move_masked_irq(struct irq_data *idata)
 	 * For correct operation this depends on the caller
 	 * masking the irqs.
 	 */
-	if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
-		   < nr_cpu_ids)) {
-		int ret = chip->irq_set_affinity(&desc->irq_data,
-						 desc->pending_mask, false);
-		switch (ret) {
-		case IRQ_SET_MASK_OK:
-			cpumask_copy(desc->irq_data.affinity, desc->pending_mask);
-		case IRQ_SET_MASK_OK_NOCOPY:
-			irq_set_thread_affinity(desc);
-		}
-	}
+	if (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids)
+		irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false);
 
 	cpumask_clear(desc->pending_mask);
 }

[PATCH v3 3/4] IRQ,x86: normalize return value of chip->irq_set_affinity() method

[Jiang Liu]

On x86 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@huawei.com>
---
 arch/x86/kernel/apic/io_apic.c |   11 ++++++-----
 arch/x86/platform/uv/uv_irq.c  |    2 +-
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 6d10a66..092a715 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2346,6 +2346,7 @@ ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 		/* Only the high 8 bits are valid. */
 		dest = SET_APIC_LOGICAL_ID(dest);
 		__target_IO_APIC_irq(irq, dest, data->chip_data);
+		ret = IRQ_SET_MASK_OK_NOCOPY;
 	}
 	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 	return ret;
@@ -2404,7 +2405,7 @@ ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 		send_cleanup_vector(cfg);
 
 	cpumask_copy(data->affinity, mask);
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 #else
@@ -3209,7 +3210,7 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 
 	__write_msi_msg(data->msi_desc, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 #endif /* CONFIG_SMP */
 
@@ -3366,7 +3367,7 @@ dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
 
 	dmar_msi_write(irq, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 #endif /* CONFIG_SMP */
@@ -3419,7 +3420,7 @@ static int hpet_msi_set_affinity(struct irq_data *data,
 
 	hpet_msi_write(data->handler_data, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 #endif /* CONFIG_SMP */
@@ -3499,7 +3500,7 @@ ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 		return -1;
 
 	target_ht_irq(data->irq, dest, cfg->vector);
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 #endif
diff --git a/arch/x86/platform/uv/uv_irq.c b/arch/x86/platform/uv/uv_irq.c
index f25c276..a22c416 100644
--- a/arch/x86/platform/uv/uv_irq.c
+++ b/arch/x86/platform/uv/uv_irq.c
@@ -222,7 +222,7 @@ uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 	if (cfg->move_in_progress)
 		send_cleanup_vector(cfg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 /*
-- 
1.7.5.4

Re: [PATCH v3 3/4] IRQ,x86: normalize return value of chip->irq_set_affinity() method

[Thomas Gleixner]

On Fri, 30 Mar 2012, Jiang Liu wrote:

> On x86 platforms, interrupt controller chip's irq_set_affinity() method
> always copies affinity mask to irq_data->affinity field but still returns

Now the question here is whether it copies the mask because it
modified the mask in some way and want to reflect the change back.

If it just copies the unmodified mask, then this patch is wrong. It
should remove the copy from the arch code and return IRQ_SET_MASK_OK
so the core code can take care of the copying.

Ditto for the ia64 one.

Thanks,

	tglx

Re: [PATCH v3 3/4] IRQ,x86: normalize return value of chip->irq_set_affinity() method

[Jiang Liu]

Hi Thomas,
	Thanks for point this out. After checking related code again, I found
the method suggested by you will produce better code, so will send out another
version to remove the duplicated memory copy operations in arch specific code.
	When I was reading the comment for IRQ_SET_MASK_OK_NOCOPY, I thought
both way are ok to update the affinity mask by arch code or core logic, and
haven't realized the issue raised by you.
	Thanks!
	Gerry

On 03/31/2012 05:23 AM, Thomas Gleixner wrote:
> On Fri, 30 Mar 2012, Jiang Liu wrote:
> 
>> On x86 platforms, interrupt controller chip's irq_set_affinity() method
>> always copies affinity mask to irq_data->affinity field but still returns
> 
> Now the question here is whether it copies the mask because it
> modified the mask in some way and want to reflect the change back.
> 
> If it just copies the unmodified mask, then this patch is wrong. It
> should remove the copy from the arch code and return IRQ_SET_MASK_OK
> so the core code can take care of the copying.
> 
> Ditto for the ia64 one.
> 
> Thanks,
> 
> 	tglx

[PATCH 1/4] IRQ,x86: remove redundant memory copy operations in chip->irq_set_affinity()

[Jiang Liu]

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 x86 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@huawei.com>
---
 arch/x86/kernel/apic/io_apic.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 6d10a66..c68954e 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2326,9 +2326,8 @@ int __ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	if (assign_irq_vector(data->irq, data->chip_data, mask))
 		return -1;
 
-	cpumask_copy(data->affinity, mask);
-
 	*dest_id = apic->cpu_mask_to_apicid_and(mask, cfg->domain);
+
 	return 0;
 }
 
@@ -2403,7 +2402,6 @@ ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	if (cfg->move_in_progress)
 		send_cleanup_vector(cfg);
 
-	cpumask_copy(data->affinity, mask);
 	return 0;
 }
 
@@ -3832,6 +3830,8 @@ void __init setup_ioapic_dest(void)
 			ir_ioapic_set_affinity(idata, mask, false);
 		else
 			ioapic_set_affinity(idata, mask, false);
+
+		cpumask_copy(idata->affinity, mask);
 	}
 
 }
-- 
1.7.5.4

[PATCH 2/4] IRQ,x86: normalize return value of chip->irq_set_affinity() method

[Jiang Liu]

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.  So use IRQ_SET_MASK_OK instead of 0 for consistency.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
---
 arch/x86/kernel/apic/io_apic.c |   11 ++++++-----
 arch/x86/platform/uv/uv_irq.c  |    2 +-
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index c68954e..18e73b3 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2345,6 +2345,7 @@ ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 		/* Only the high 8 bits are valid. */
 		dest = SET_APIC_LOGICAL_ID(dest);
 		__target_IO_APIC_irq(irq, dest, data->chip_data);
+		ret = IRQ_SET_MASK_OK;
 	}
 	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 	return ret;
@@ -2402,7 +2403,7 @@ ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	if (cfg->move_in_progress)
 		send_cleanup_vector(cfg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 
 #else
@@ -3207,7 +3208,7 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 
 	__write_msi_msg(data->msi_desc, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 #endif /* CONFIG_SMP */
 
@@ -3364,7 +3365,7 @@ dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
 
 	dmar_msi_write(irq, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 
 #endif /* CONFIG_SMP */
@@ -3417,7 +3418,7 @@ static int hpet_msi_set_affinity(struct irq_data *data,
 
 	hpet_msi_write(data->handler_data, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 
 #endif /* CONFIG_SMP */
@@ -3497,7 +3498,7 @@ ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 		return -1;
 
 	target_ht_irq(data->irq, dest, cfg->vector);
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 
 #endif
diff --git a/arch/x86/platform/uv/uv_irq.c b/arch/x86/platform/uv/uv_irq.c
index f25c276..67e3509 100644
--- a/arch/x86/platform/uv/uv_irq.c
+++ b/arch/x86/platform/uv/uv_irq.c
@@ -222,7 +222,7 @@ uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 	if (cfg->move_in_progress)
 		send_cleanup_vector(cfg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 
 /*
-- 
1.7.5.4

[PATCH 3/4] IRQ,IA64: remove redundant memory copy operations in chip->irq_set_affinity()

[Jiang Liu]

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@huawei.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

[PATCH 3/4] IRQ,IA64: remove redundant memory copy operations in chip->irq_set_affinity()

[Jiang Liu]

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@huawei.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

[PATCH 4/4] IRQ,IA64: normalize return value of chip->irq_set_affinity() method

[Jiang Liu]

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. So use IRQ_SET_MASK_OK instead of 0 for consistency.

Signed-off-by: Jiang Liu <jiang.liu@huawei.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, 6 insertions(+), 6 deletions(-)

diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index ef4b5d8..5f67fcb 100644
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -372,9 +372,9 @@ iosapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 		iosapic_write(iosapic, IOSAPIC_RTE_HIGH(rte_index), high32);
 		iosapic_write(iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
 	}
-
 #endif
-	return 0;
+
+	return IRQ_SET_MASK_OK;
 }
 
 /*
diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
index 05f5dc6..e1cc71d 100644
--- a/arch/ia64/kernel/msi_ia64.c
+++ b/arch/ia64/kernel/msi_ia64.c
@@ -40,7 +40,7 @@ static int ia64_set_msi_irq_affinity(struct irq_data *idata,
 
 	write_msi_msg(irq, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 #endif /* CONFIG_SMP */
 
@@ -155,7 +155,7 @@ static int dmar_msi_set_affinity(struct irq_data *data,
 
 	dmar_msi_write(irq, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 #endif /* CONFIG_SMP */
 
diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c
index 62cf4dd..57cedda 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;
 }
 
 #ifdef CONFIG_SMP
diff --git a/arch/ia64/sn/kernel/msi_sn.c b/arch/ia64/sn/kernel/msi_sn.c
index a033fc9..4249c87 100644
--- a/arch/ia64/sn/kernel/msi_sn.c
+++ b/arch/ia64/sn/kernel/msi_sn.c
@@ -207,7 +207,7 @@ static int sn_set_msi_irq_affinity(struct irq_data *data,
 
 	write_msi_msg(irq, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 #endif /* CONFIG_SMP */
 
-- 
1.7.5.4

[PATCH 4/4] IRQ,IA64: normalize return value of chip->irq_set_affinity() method

[Jiang Liu]

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. So use IRQ_SET_MASK_OK instead of 0 for consistency.

Signed-off-by: Jiang Liu <jiang.liu@huawei.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, 6 insertions(+), 6 deletions(-)

diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index ef4b5d8..5f67fcb 100644
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -372,9 +372,9 @@ iosapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 		iosapic_write(iosapic, IOSAPIC_RTE_HIGH(rte_index), high32);
 		iosapic_write(iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
 	}
-
 #endif
-	return 0;
+
+	return IRQ_SET_MASK_OK;
 }
 
 /*
diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
index 05f5dc6..e1cc71d 100644
--- a/arch/ia64/kernel/msi_ia64.c
+++ b/arch/ia64/kernel/msi_ia64.c
@@ -40,7 +40,7 @@ static int ia64_set_msi_irq_affinity(struct irq_data *idata,
 
 	write_msi_msg(irq, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 #endif /* CONFIG_SMP */
 
@@ -155,7 +155,7 @@ static int dmar_msi_set_affinity(struct irq_data *data,
 
 	dmar_msi_write(irq, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 #endif /* CONFIG_SMP */
 
diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c
index 62cf4dd..57cedda 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;
 }
 
 #ifdef CONFIG_SMP
diff --git a/arch/ia64/sn/kernel/msi_sn.c b/arch/ia64/sn/kernel/msi_sn.c
index a033fc9..4249c87 100644
--- a/arch/ia64/sn/kernel/msi_sn.c
+++ b/arch/ia64/sn/kernel/msi_sn.c
@@ -207,7 +207,7 @@ static int sn_set_msi_irq_affinity(struct irq_data *data,
 
 	write_msi_msg(irq, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK;
 }
 #endif /* CONFIG_SMP */
 
-- 
1.7.5.4

[tip:x86/cleanups] x86: Return IRQ_SET_MASK_OK_NOCOPY from irq affinity functions

[tip-bot for Jiang Liu]

Commit-ID:  f841d792e38f75f5e25b0b66f7b5d235d180a735
Gitweb:     http://git.kernel.org/tip/f841d792e38f75f5e25b0b66f7b5d235d180a735
Author:     Jiang Liu <liuj97@gmail.com>
AuthorDate: Fri, 30 Mar 2012 23:11:35 +0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 24 May 2012 23:16:33 +0200

x86: Return IRQ_SET_MASK_OK_NOCOPY from irq affinity functions

The interrupt chip irq_set_affinity() functions copy the affinity mask
to irq_data->affinity but return 0, i.e. IRQ_SET_MASK_OK.
IRQ_SET_MASK_OK causes the core code to do another redundant copy.

Return IRQ_SET_MASK_OK_NOCOPY to avoid this.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Cliff Wickman <cpw@sgi.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Keping Chen <chenkeping@huawei.com>
Link: http://lkml.kernel.org/r/1333120296-13563-4-git-send-email-jiang.liu@huawei.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/kernel/apic/io_apic.c |    9 +++++----
 arch/x86/platform/uv/uv_irq.c  |    2 +-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index ac96561..bce2001 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2270,6 +2270,7 @@ ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 		/* Only the high 8 bits are valid. */
 		dest = SET_APIC_LOGICAL_ID(dest);
 		__target_IO_APIC_irq(irq, dest, data->chip_data);
+		ret = IRQ_SET_MASK_OK_NOCOPY;
 	}
 	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 	return ret;
@@ -3092,7 +3093,7 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 
 	__write_msi_msg(data->msi_desc, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 #endif /* CONFIG_SMP */
 
@@ -3214,7 +3215,7 @@ dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
 
 	dmar_msi_write(irq, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 #endif /* CONFIG_SMP */
@@ -3267,7 +3268,7 @@ static int hpet_msi_set_affinity(struct irq_data *data,
 
 	hpet_msi_write(data->handler_data, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 #endif /* CONFIG_SMP */
@@ -3340,7 +3341,7 @@ ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 		return -1;
 
 	target_ht_irq(data->irq, dest, cfg->vector);
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 #endif
diff --git a/arch/x86/platform/uv/uv_irq.c b/arch/x86/platform/uv/uv_irq.c
index f25c276..a22c416 100644
--- a/arch/x86/platform/uv/uv_irq.c
+++ b/arch/x86/platform/uv/uv_irq.c
@@ -222,7 +222,7 @@ uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 	if (cfg->move_in_progress)
 		send_cleanup_vector(cfg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 /*

[PATCH v3 4/4] IRQ,IA64: normalize return value of chip->irq_set_affinity() method

[Jiang Liu]

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@huawei.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

[PATCH v3 4/4] IRQ,IA64: normalize return value of chip->irq_set_affinity() method

[Jiang Liu]

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@huawei.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