[PATCH 1/6] x86/x2apic/cluster: vector_allocation_domain() should return a value

[PATCH 1/6] x86/x2apic/cluster: vector_allocation_domain() should return a value

[Alexander Gordeev]

Since 5a48cd5 vector_allocation_domain() indicates if a cpumask is
dynamic or static. This update fixes the oversight and makes the
operation to return a value.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
 arch/x86/kernel/apic/x2apic_cluster.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index 23a46cf..1885a73 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -228,10 +228,11 @@ static int x2apic_cluster_probe(void)
 /*
  * Each x2apic cluster is an allocation domain.
  */
-static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask)
+static bool cluster_vector_allocation_domain(int cpu, struct cpumask *retmask)
 {
 	cpumask_clear(retmask);
 	cpumask_copy(retmask, per_cpu(cpus_in_cluster, cpu));
+	return true;
 }
 
 static struct apic apic_x2apic_cluster = {
-- 
1.7.7.6


-- 
Regards,
Alexander Gordeev
agordeev@redhat.com

Re: [PATCH 1/6] x86/x2apic/cluster: vector_allocation_domain() should return a value

[Ingo Molnar]

* Alexander Gordeev <agordeev@redhat.com> wrote:

> Since 5a48cd5 vector_allocation_domain() indicates if a cpumask is
> dynamic or static. This update fixes the oversight and makes the
> operation to return a value.

There's no commit 5a48cd5 in -tip. Please use such notations to 
refer to specific commits:

  Since commit 5a48cd5 ("apic: Foo, bar") ...

so that we can figure out the dependency and where the commit 
is.

Thanks,

	Ingo

[PATCH 1/6] x86/x2apic/cluster: vector_allocation_domain() should return a value

[Alexander Gordeev]

Since commit 8637e38 ("x86/apic: Avoid useless scanning thru a cpumask
in assign_irq_vector()") vector_allocation_domain() operation indicates
if a cpumask is dynamic or static. This update fixes the oversight and
makes the operation to return a value.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
 arch/x86/kernel/apic/x2apic_cluster.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index 23a46cf..1885a73 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -228,10 +228,11 @@ static int x2apic_cluster_probe(void)
 /*
  * Each x2apic cluster is an allocation domain.
  */
-static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask)
+static bool cluster_vector_allocation_domain(int cpu, struct cpumask *retmask)
 {
 	cpumask_clear(retmask);
 	cpumask_copy(retmask, per_cpu(cpus_in_cluster, cpu));
+	return true;
 }
 
 static struct apic apic_x2apic_cluster = {
-- 
1.7.7.6

-- 
Regards,
Alexander Gordeev
agordeev@redhat.com

[tip:x86/apic] x86/x2apic/cluster: Vector_allocation_domain() should return a value

[tip-bot for Alexander Gordeev]

Commit-ID:  cac4afbc3da58d9e5701b34bd4c1f11ea13328d4
Gitweb:     http://git.kernel.org/tip/cac4afbc3da58d9e5701b34bd4c1f11ea13328d4
Author:     Alexander Gordeev <agordeev@redhat.com>
AuthorDate: Thu, 14 Jun 2012 12:39:34 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 14 Jun 2012 12:53:12 +0200

x86/x2apic/cluster: Vector_allocation_domain() should return a value

Since commit 8637e38 ("x86/apic: Avoid useless scanning thru a
cpumask in assign_irq_vector()") vector_allocation_domain()
operation indicates if a cpumask is dynamic or static. This
update fixes the oversight and makes the operation to return a
value.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120614103933.GJ3383@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/apic/x2apic_cluster.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index 23a46cf..1885a73 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -228,10 +228,11 @@ static int x2apic_cluster_probe(void)
 /*
  * Each x2apic cluster is an allocation domain.
  */
-static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask)
+static bool cluster_vector_allocation_domain(int cpu, struct cpumask *retmask)
 {
 	cpumask_clear(retmask);
 	cpumask_copy(retmask, per_cpu(cpus_in_cluster, cpu));
+	return true;
 }
 
 static struct apic apic_x2apic_cluster = {

[PATCH 2/6] x86/apic: Eliminate cpu_mask_to_apicid() operation

[Alexander Gordeev]

Since there are only two locations where cpu_mask_to_apicid() is called
from, remove the operation and use only cpu_mask_to_apicid_and() instead.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Suggested-and-acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Cc: x86@kernel.org
---
 arch/x86/include/asm/apic.h           |   33 ++++++++-------------------------
 arch/x86/kernel/apic/apic.c           |   24 ++++++------------------
 arch/x86/kernel/apic/apic_flat_64.c   |    2 --
 arch/x86/kernel/apic/apic_noop.c      |    1 -
 arch/x86/kernel/apic/apic_numachip.c  |    1 -
 arch/x86/kernel/apic/bigsmp_32.c      |    1 -
 arch/x86/kernel/apic/es7000_32.c      |    4 +---
 arch/x86/kernel/apic/io_apic.c        |    3 ++-
 arch/x86/kernel/apic/numaq_32.c       |    8 --------
 arch/x86/kernel/apic/probe_32.c       |    1 -
 arch/x86/kernel/apic/summit_32.c      |    3 +--
 arch/x86/kernel/apic/x2apic_cluster.c |   17 -----------------
 arch/x86/kernel/apic/x2apic_phys.c    |    1 -
 arch/x86/kernel/apic/x2apic_uv_x.c    |   29 ++++++-----------------------
 arch/x86/platform/uv/uv_irq.c         |    2 +-
 15 files changed, 25 insertions(+), 105 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 1ed3eea..eec240e 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -331,8 +331,6 @@ struct apic {
 	unsigned long (*set_apic_id)(unsigned int id);
 	unsigned long apic_id_mask;
 
-	int (*cpu_mask_to_apicid)(const struct cpumask *cpumask,
-				  unsigned int *apicid);
 	int (*cpu_mask_to_apicid_and)(const struct cpumask *cpumask,
 				      const struct cpumask *andmask,
 				      unsigned int *apicid);
@@ -594,9 +592,15 @@ static inline int default_phys_pkg_id(int cpuid_apic, int index_msb)
 #endif
 
 static inline int
-__flat_cpu_mask_to_apicid(unsigned long cpu_mask, unsigned int *apicid)
+flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
+			    const struct cpumask *andmask,
+			    unsigned int *apicid)
 {
-	cpu_mask = cpu_mask & APIC_ALL_CPUS & cpumask_bits(cpu_online_mask)[0];
+	unsigned long cpu_mask = cpumask_bits(cpumask)[0] &
+				 cpumask_bits(andmask)[0] &
+				 cpumask_bits(cpu_online_mask)[0] &
+				 APIC_ALL_CPUS;
+
 	if (likely(cpu_mask)) {
 		*apicid = (unsigned int)cpu_mask;
 		return 0;
@@ -605,27 +609,6 @@ __flat_cpu_mask_to_apicid(unsigned long cpu_mask, unsigned int *apicid)
 	}
 }
 
-static inline int
-flat_cpu_mask_to_apicid(const struct cpumask *cpumask,
-			unsigned int *apicid)
-{
-	return __flat_cpu_mask_to_apicid(cpumask_bits(cpumask)[0], apicid);
-}
-
-static inline int
-flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
-			    const struct cpumask *andmask,
-			    unsigned int *apicid)
-{
-	unsigned long mask1 = cpumask_bits(cpumask)[0];
-	unsigned long mask2 = cpumask_bits(andmask)[0];
-	return __flat_cpu_mask_to_apicid(mask1 & mask2, apicid);
-}
-
-extern int
-default_cpu_mask_to_apicid(const struct cpumask *cpumask,
-			   unsigned int *apicid);
-
 extern int
 default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			       const struct cpumask *andmask,
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 7e9bbe7..048a4f8 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2123,23 +2123,6 @@ void default_init_apic_ldr(void)
 	apic_write(APIC_LDR, val);
 }
 
-static inline int __default_cpu_to_apicid(int cpu, unsigned int *apicid)
-{
-	if (likely((unsigned int)cpu < nr_cpu_ids)) {
-		*apicid = per_cpu(x86_cpu_to_apicid, cpu);
-		return 0;
-	} else {
-		return -EINVAL;
-	}
-}
-
-int default_cpu_mask_to_apicid(const struct cpumask *cpumask,
-			       unsigned int *apicid)
-{
-	int cpu = cpumask_first_and(cpumask, cpu_online_mask);
-	return __default_cpu_to_apicid(cpu, apicid);
-}
-
 int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 				   const struct cpumask *andmask,
 				   unsigned int *apicid)
@@ -2151,7 +2134,12 @@ int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			break;
 	}
 
-	return __default_cpu_to_apicid(cpu, apicid);
+	if (likely((unsigned int)cpu < nr_cpu_ids)) {
+		*apicid = per_cpu(x86_cpu_to_apicid, cpu);
+		return 0;
+	} else {
+		return -EINVAL;
+	}
 }
 
 /*
diff --git a/arch/x86/kernel/apic/apic_flat_64.c b/arch/x86/kernel/apic/apic_flat_64.c
index bddc925..00c77cf 100644
--- a/arch/x86/kernel/apic/apic_flat_64.c
+++ b/arch/x86/kernel/apic/apic_flat_64.c
@@ -191,7 +191,6 @@ static struct apic apic_flat =  {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFu << 24,
 
-	.cpu_mask_to_apicid		= flat_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= flat_send_IPI_mask,
@@ -308,7 +307,6 @@ static struct apic apic_physflat =  {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFu << 24,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= physflat_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/apic_noop.c b/arch/x86/kernel/apic/apic_noop.c
index ac9edf2..65c07fc 100644
--- a/arch/x86/kernel/apic/apic_noop.c
+++ b/arch/x86/kernel/apic/apic_noop.c
@@ -159,7 +159,6 @@ struct apic apic_noop = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0x0F << 24,
 
-	.cpu_mask_to_apicid		= flat_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= noop_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/apic_numachip.c b/arch/x86/kernel/apic/apic_numachip.c
index c028132..bc552cf 100644
--- a/arch/x86/kernel/apic/apic_numachip.c
+++ b/arch/x86/kernel/apic/apic_numachip.c
@@ -234,7 +234,6 @@ static struct apic apic_numachip __refconst = {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xffU << 24,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= numachip_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/bigsmp_32.c b/arch/x86/kernel/apic/bigsmp_32.c
index df342fe..d50e364 100644
--- a/arch/x86/kernel/apic/bigsmp_32.c
+++ b/arch/x86/kernel/apic/bigsmp_32.c
@@ -188,7 +188,6 @@ static struct apic apic_bigsmp = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= bigsmp_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index b35cfb9..2c5317e 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -525,7 +525,7 @@ static int es7000_check_phys_apicid_present(int cpu_physical_apicid)
 	return 1;
 }
 
-static int
+static inline int
 es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
@@ -643,7 +643,6 @@ static struct apic __refdata apic_es7000_cluster = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= es7000_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= es7000_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= es7000_send_IPI_mask,
@@ -710,7 +709,6 @@ static struct apic __refdata apic_es7000 = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= es7000_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= es7000_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= es7000_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 0deb773..0540f08 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1492,7 +1492,8 @@ static void __init setup_timer_IRQ0_pin(unsigned int ioapic_idx,
 	 * We use logical delivery to get the timer IRQ
 	 * to the first CPU.
 	 */
-	if (unlikely(apic->cpu_mask_to_apicid(apic->target_cpus(), &dest)))
+	if (unlikely(apic->cpu_mask_to_apicid_and(apic->target_cpus(),
+						  apic->target_cpus(), &dest)))
 		dest = BAD_APICID;
 
 	entry.dest_mode = apic->irq_dest_mode;
diff --git a/arch/x86/kernel/apic/numaq_32.c b/arch/x86/kernel/apic/numaq_32.c
index 2b55514..d661ee9 100644
--- a/arch/x86/kernel/apic/numaq_32.c
+++ b/arch/x86/kernel/apic/numaq_32.c
@@ -407,13 +407,6 @@ static inline int numaq_check_phys_apicid_present(int phys_apicid)
  * physical broadcast to stop people from breaking us
  */
 static int
-numaq_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *apicid)
-{
-	*apicid = 0x0F;
-	return 0;
-}
-
-static int
 numaq_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			     const struct cpumask *andmask,
 			     unsigned int *apicid)
@@ -499,7 +492,6 @@ static struct apic __refdata apic_numaq = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0x0F << 24,
 
-	.cpu_mask_to_apicid		= numaq_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= numaq_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= numaq_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/probe_32.c b/arch/x86/kernel/apic/probe_32.c
index 2c6f003..eef6bcd 100644
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -108,7 +108,6 @@ static struct apic apic_default = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0x0F << 24,
 
-	.cpu_mask_to_apicid		= flat_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= default_send_IPI_mask_logical,
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index 79d360f..bbad180 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -263,7 +263,7 @@ static int summit_check_phys_apicid_present(int physical_apicid)
 	return 1;
 }
 
-static int
+static inline int
 summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
@@ -516,7 +516,6 @@ static struct apic apic_summit = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= summit_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= summit_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= summit_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index 1885a73..943d03f 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -97,22 +97,6 @@ static void x2apic_send_IPI_all(int vector)
 }
 
 static int
-x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *apicid)
-{
-	int cpu = cpumask_first_and(cpumask, cpu_online_mask);
-	int i;
-
-	if (cpu >= nr_cpu_ids)
-		return -EINVAL;
-
-	*apicid = 0;
-	for_each_cpu_and(i, cpumask, per_cpu(cpus_in_cluster, cpu))
-		*apicid |= per_cpu(x86_cpu_to_logical_apicid, i);
-
-	return 0;
-}
-
-static int
 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			      const struct cpumask *andmask,
 			      unsigned int *apicid)
@@ -270,7 +254,6 @@ static struct apic apic_x2apic_cluster = {
 	.set_apic_id			= x2apic_set_apic_id,
 	.apic_id_mask			= 0xFFFFFFFFu,
 
-	.cpu_mask_to_apicid		= x2apic_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= x2apic_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= x2apic_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c
index f109388..e03a1e1 100644
--- a/arch/x86/kernel/apic/x2apic_phys.c
+++ b/arch/x86/kernel/apic/x2apic_phys.c
@@ -123,7 +123,6 @@ static struct apic apic_x2apic_phys = {
 	.set_apic_id			= x2apic_set_apic_id,
 	.apic_id_mask			= 0xFFFFFFFFu,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= x2apic_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 307aa07..026de01 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -269,27 +269,6 @@ static void uv_init_apic_ldr(void)
 {
 }
 
-static inline int __uv_cpu_to_apicid(int cpu, unsigned int *apicid)
-{
-	if (likely((unsigned int)cpu < nr_cpu_ids)) {
-		*apicid = per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
-		return 0;
-	} else {
-		return -EINVAL;
-	}
-}
-
-static int
-uv_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *apicid)
-{
-	/*
-	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
-	 * May as well be the first.
-	 */
-	int cpu = cpumask_first_and(cpumask, cpu_online_mask);
-	return __uv_cpu_to_apicid(cpu, apicid);
-}
-
 static int
 uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			  const struct cpumask *andmask,
@@ -306,7 +285,12 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			break;
 	}
 
-	return __uv_cpu_to_apicid(cpu, apicid);
+	if (likely((unsigned int)cpu < nr_cpu_ids)) {
+		*apicid = per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
+		return 0;
+	} else {
+		return -EINVAL;
+	}
 }
 
 static unsigned int x2apic_get_apic_id(unsigned long x)
@@ -384,7 +368,6 @@ static struct apic __refdata apic_x2apic_uv_x = {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFFFFFFFu,
 
-	.cpu_mask_to_apicid		= uv_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= uv_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= uv_send_IPI_mask,
diff --git a/arch/x86/platform/uv/uv_irq.c b/arch/x86/platform/uv/uv_irq.c
index dd1ff39..a67c7a6 100644
--- a/arch/x86/platform/uv/uv_irq.c
+++ b/arch/x86/platform/uv/uv_irq.c
@@ -144,7 +144,7 @@ arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
 	if (err != 0)
 		return err;
 
-	err = apic->cpu_mask_to_apicid(eligible_cpu, &dest);
+	err = apic->cpu_mask_to_apicid_and(eligible_cpu, eligible_cpu, &dest);
 	if (err != 0)
 		return err;
 
-- 
1.7.7.6


-- 
Regards,
Alexander Gordeev
agordeev@redhat.com

[tip:x86/apic] x86/apic: Eliminate cpu_mask_to_apicid() operation

[tip-bot for Alexander Gordeev]

Commit-ID:  a5a391561bc25898ba1a702a0c4b028aa5b11ce9
Gitweb:     http://git.kernel.org/tip/a5a391561bc25898ba1a702a0c4b028aa5b11ce9
Author:     Alexander Gordeev <agordeev@redhat.com>
AuthorDate: Thu, 14 Jun 2012 09:49:35 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 14 Jun 2012 12:53:13 +0200

x86/apic: Eliminate cpu_mask_to_apicid() operation

Since there are only two locations where cpu_mask_to_apicid() is
called from, remove the operation and use only
cpu_mask_to_apicid_and() instead.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Suggested-and-acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120614074935.GE3383@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/include/asm/apic.h           |   33 ++++++++-------------------------
 arch/x86/kernel/apic/apic.c           |   24 ++++++------------------
 arch/x86/kernel/apic/apic_flat_64.c   |    2 --
 arch/x86/kernel/apic/apic_noop.c      |    1 -
 arch/x86/kernel/apic/apic_numachip.c  |    1 -
 arch/x86/kernel/apic/bigsmp_32.c      |    1 -
 arch/x86/kernel/apic/es7000_32.c      |    4 +---
 arch/x86/kernel/apic/io_apic.c        |    3 ++-
 arch/x86/kernel/apic/numaq_32.c       |    8 --------
 arch/x86/kernel/apic/probe_32.c       |    1 -
 arch/x86/kernel/apic/summit_32.c      |    3 +--
 arch/x86/kernel/apic/x2apic_cluster.c |   17 -----------------
 arch/x86/kernel/apic/x2apic_phys.c    |    1 -
 arch/x86/kernel/apic/x2apic_uv_x.c    |   29 ++++++-----------------------
 arch/x86/platform/uv/uv_irq.c         |    2 +-
 15 files changed, 25 insertions(+), 105 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 1ed3eea..eec240e 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -331,8 +331,6 @@ struct apic {
 	unsigned long (*set_apic_id)(unsigned int id);
 	unsigned long apic_id_mask;
 
-	int (*cpu_mask_to_apicid)(const struct cpumask *cpumask,
-				  unsigned int *apicid);
 	int (*cpu_mask_to_apicid_and)(const struct cpumask *cpumask,
 				      const struct cpumask *andmask,
 				      unsigned int *apicid);
@@ -594,9 +592,15 @@ static inline int default_phys_pkg_id(int cpuid_apic, int index_msb)
 #endif
 
 static inline int
-__flat_cpu_mask_to_apicid(unsigned long cpu_mask, unsigned int *apicid)
+flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
+			    const struct cpumask *andmask,
+			    unsigned int *apicid)
 {
-	cpu_mask = cpu_mask & APIC_ALL_CPUS & cpumask_bits(cpu_online_mask)[0];
+	unsigned long cpu_mask = cpumask_bits(cpumask)[0] &
+				 cpumask_bits(andmask)[0] &
+				 cpumask_bits(cpu_online_mask)[0] &
+				 APIC_ALL_CPUS;
+
 	if (likely(cpu_mask)) {
 		*apicid = (unsigned int)cpu_mask;
 		return 0;
@@ -605,27 +609,6 @@ __flat_cpu_mask_to_apicid(unsigned long cpu_mask, unsigned int *apicid)
 	}
 }
 
-static inline int
-flat_cpu_mask_to_apicid(const struct cpumask *cpumask,
-			unsigned int *apicid)
-{
-	return __flat_cpu_mask_to_apicid(cpumask_bits(cpumask)[0], apicid);
-}
-
-static inline int
-flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
-			    const struct cpumask *andmask,
-			    unsigned int *apicid)
-{
-	unsigned long mask1 = cpumask_bits(cpumask)[0];
-	unsigned long mask2 = cpumask_bits(andmask)[0];
-	return __flat_cpu_mask_to_apicid(mask1 & mask2, apicid);
-}
-
-extern int
-default_cpu_mask_to_apicid(const struct cpumask *cpumask,
-			   unsigned int *apicid);
-
 extern int
 default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			       const struct cpumask *andmask,
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 7e9bbe7..048a4f8 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2123,23 +2123,6 @@ void default_init_apic_ldr(void)
 	apic_write(APIC_LDR, val);
 }
 
-static inline int __default_cpu_to_apicid(int cpu, unsigned int *apicid)
-{
-	if (likely((unsigned int)cpu < nr_cpu_ids)) {
-		*apicid = per_cpu(x86_cpu_to_apicid, cpu);
-		return 0;
-	} else {
-		return -EINVAL;
-	}
-}
-
-int default_cpu_mask_to_apicid(const struct cpumask *cpumask,
-			       unsigned int *apicid)
-{
-	int cpu = cpumask_first_and(cpumask, cpu_online_mask);
-	return __default_cpu_to_apicid(cpu, apicid);
-}
-
 int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 				   const struct cpumask *andmask,
 				   unsigned int *apicid)
@@ -2151,7 +2134,12 @@ int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			break;
 	}
 
-	return __default_cpu_to_apicid(cpu, apicid);
+	if (likely((unsigned int)cpu < nr_cpu_ids)) {
+		*apicid = per_cpu(x86_cpu_to_apicid, cpu);
+		return 0;
+	} else {
+		return -EINVAL;
+	}
 }
 
 /*
diff --git a/arch/x86/kernel/apic/apic_flat_64.c b/arch/x86/kernel/apic/apic_flat_64.c
index bddc925..00c77cf 100644
--- a/arch/x86/kernel/apic/apic_flat_64.c
+++ b/arch/x86/kernel/apic/apic_flat_64.c
@@ -191,7 +191,6 @@ static struct apic apic_flat =  {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFu << 24,
 
-	.cpu_mask_to_apicid		= flat_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= flat_send_IPI_mask,
@@ -308,7 +307,6 @@ static struct apic apic_physflat =  {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFu << 24,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= physflat_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/apic_noop.c b/arch/x86/kernel/apic/apic_noop.c
index ac9edf2..65c07fc 100644
--- a/arch/x86/kernel/apic/apic_noop.c
+++ b/arch/x86/kernel/apic/apic_noop.c
@@ -159,7 +159,6 @@ struct apic apic_noop = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0x0F << 24,
 
-	.cpu_mask_to_apicid		= flat_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= noop_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/apic_numachip.c b/arch/x86/kernel/apic/apic_numachip.c
index c028132..bc552cf 100644
--- a/arch/x86/kernel/apic/apic_numachip.c
+++ b/arch/x86/kernel/apic/apic_numachip.c
@@ -234,7 +234,6 @@ static struct apic apic_numachip __refconst = {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xffU << 24,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= numachip_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/bigsmp_32.c b/arch/x86/kernel/apic/bigsmp_32.c
index df342fe..d50e364 100644
--- a/arch/x86/kernel/apic/bigsmp_32.c
+++ b/arch/x86/kernel/apic/bigsmp_32.c
@@ -188,7 +188,6 @@ static struct apic apic_bigsmp = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= bigsmp_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index b35cfb9..2c5317e 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -525,7 +525,7 @@ static int es7000_check_phys_apicid_present(int cpu_physical_apicid)
 	return 1;
 }
 
-static int
+static inline int
 es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
@@ -643,7 +643,6 @@ static struct apic __refdata apic_es7000_cluster = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= es7000_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= es7000_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= es7000_send_IPI_mask,
@@ -710,7 +709,6 @@ static struct apic __refdata apic_es7000 = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= es7000_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= es7000_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= es7000_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 0deb773..0540f08 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1492,7 +1492,8 @@ static void __init setup_timer_IRQ0_pin(unsigned int ioapic_idx,
 	 * We use logical delivery to get the timer IRQ
 	 * to the first CPU.
 	 */
-	if (unlikely(apic->cpu_mask_to_apicid(apic->target_cpus(), &dest)))
+	if (unlikely(apic->cpu_mask_to_apicid_and(apic->target_cpus(),
+						  apic->target_cpus(), &dest)))
 		dest = BAD_APICID;
 
 	entry.dest_mode = apic->irq_dest_mode;
diff --git a/arch/x86/kernel/apic/numaq_32.c b/arch/x86/kernel/apic/numaq_32.c
index 2b55514..d661ee9 100644
--- a/arch/x86/kernel/apic/numaq_32.c
+++ b/arch/x86/kernel/apic/numaq_32.c
@@ -407,13 +407,6 @@ static inline int numaq_check_phys_apicid_present(int phys_apicid)
  * physical broadcast to stop people from breaking us
  */
 static int
-numaq_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *apicid)
-{
-	*apicid = 0x0F;
-	return 0;
-}
-
-static int
 numaq_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			     const struct cpumask *andmask,
 			     unsigned int *apicid)
@@ -499,7 +492,6 @@ static struct apic __refdata apic_numaq = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0x0F << 24,
 
-	.cpu_mask_to_apicid		= numaq_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= numaq_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= numaq_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/probe_32.c b/arch/x86/kernel/apic/probe_32.c
index 2c6f003..eef6bcd 100644
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -108,7 +108,6 @@ static struct apic apic_default = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0x0F << 24,
 
-	.cpu_mask_to_apicid		= flat_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= default_send_IPI_mask_logical,
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index 79d360f..bbad180 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -263,7 +263,7 @@ static int summit_check_phys_apicid_present(int physical_apicid)
 	return 1;
 }
 
-static int
+static inline int
 summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
@@ -516,7 +516,6 @@ static struct apic apic_summit = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= summit_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= summit_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= summit_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index 1885a73..943d03f 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -97,22 +97,6 @@ static void x2apic_send_IPI_all(int vector)
 }
 
 static int
-x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *apicid)
-{
-	int cpu = cpumask_first_and(cpumask, cpu_online_mask);
-	int i;
-
-	if (cpu >= nr_cpu_ids)
-		return -EINVAL;
-
-	*apicid = 0;
-	for_each_cpu_and(i, cpumask, per_cpu(cpus_in_cluster, cpu))
-		*apicid |= per_cpu(x86_cpu_to_logical_apicid, i);
-
-	return 0;
-}
-
-static int
 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			      const struct cpumask *andmask,
 			      unsigned int *apicid)
@@ -270,7 +254,6 @@ static struct apic apic_x2apic_cluster = {
 	.set_apic_id			= x2apic_set_apic_id,
 	.apic_id_mask			= 0xFFFFFFFFu,
 
-	.cpu_mask_to_apicid		= x2apic_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= x2apic_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= x2apic_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c
index f109388..e03a1e1 100644
--- a/arch/x86/kernel/apic/x2apic_phys.c
+++ b/arch/x86/kernel/apic/x2apic_phys.c
@@ -123,7 +123,6 @@ static struct apic apic_x2apic_phys = {
 	.set_apic_id			= x2apic_set_apic_id,
 	.apic_id_mask			= 0xFFFFFFFFu,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= x2apic_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 307aa07..026de01 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -269,27 +269,6 @@ static void uv_init_apic_ldr(void)
 {
 }
 
-static inline int __uv_cpu_to_apicid(int cpu, unsigned int *apicid)
-{
-	if (likely((unsigned int)cpu < nr_cpu_ids)) {
-		*apicid = per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
-		return 0;
-	} else {
-		return -EINVAL;
-	}
-}
-
-static int
-uv_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *apicid)
-{
-	/*
-	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
-	 * May as well be the first.
-	 */
-	int cpu = cpumask_first_and(cpumask, cpu_online_mask);
-	return __uv_cpu_to_apicid(cpu, apicid);
-}
-
 static int
 uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			  const struct cpumask *andmask,
@@ -306,7 +285,12 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			break;
 	}
 
-	return __uv_cpu_to_apicid(cpu, apicid);
+	if (likely((unsigned int)cpu < nr_cpu_ids)) {
+		*apicid = per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
+		return 0;
+	} else {
+		return -EINVAL;
+	}
 }
 
 static unsigned int x2apic_get_apic_id(unsigned long x)
@@ -384,7 +368,6 @@ static struct apic __refdata apic_x2apic_uv_x = {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFFFFFFFu,
 
-	.cpu_mask_to_apicid		= uv_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= uv_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= uv_send_IPI_mask,
diff --git a/arch/x86/platform/uv/uv_irq.c b/arch/x86/platform/uv/uv_irq.c
index dd1ff39..a67c7a6 100644
--- a/arch/x86/platform/uv/uv_irq.c
+++ b/arch/x86/platform/uv/uv_irq.c
@@ -144,7 +144,7 @@ arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
 	if (err != 0)
 		return err;
 
-	err = apic->cpu_mask_to_apicid(eligible_cpu, &dest);
+	err = apic->cpu_mask_to_apicid_and(eligible_cpu, eligible_cpu, &dest);
 	if (err != 0)
 		return err;
 

[PATCH 3/6] x86/apic: Fix ugly casting and branching in cpu_mask_to_apicid_and()

[Alexander Gordeev]

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
 arch/x86/kernel/apic/apic.c        |    8 ++++----
 arch/x86/kernel/apic/es7000_32.c   |    2 +-
 arch/x86/kernel/apic/summit_32.c   |    2 +-
 arch/x86/kernel/apic/x2apic_uv_x.c |    8 ++++----
 4 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 048a4f8..c421512 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2127,19 +2127,19 @@ int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 				   const struct cpumask *andmask,
 				   unsigned int *apicid)
 {
-	int cpu;
+	unsigned int cpu;
 
 	for_each_cpu_and(cpu, cpumask, andmask) {
 		if (cpumask_test_cpu(cpu, cpu_online_mask))
 			break;
 	}
 
-	if (likely((unsigned int)cpu < nr_cpu_ids)) {
+	if (likely(cpu < nr_cpu_ids)) {
 		*apicid = per_cpu(x86_cpu_to_apicid, cpu);
 		return 0;
-	} else {
-		return -EINVAL;
 	}
+
+	return -EINVAL;
 }
 
 /*
diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 2c5317e..effece2 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -529,7 +529,7 @@ static inline int
 es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
-	int cpu, uninitialized_var(apicid);
+	unsigned int cpu, uninitialized_var(apicid);
 
 	/*
 	 * The cpus in the mask must all be on the apic cluster.
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index bbad180..b53fd6c 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -267,7 +267,7 @@ static inline int
 summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
-	int cpu, apicid = 0;
+	unsigned int cpu, apicid = 0;
 
 	/*
 	 * The cpus in the mask must all be on the apic cluster.
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 026de01..8cfade9 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -274,7 +274,7 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			  const struct cpumask *andmask,
 			  unsigned int *apicid)
 {
-	int cpu;
+	int unsigned cpu;
 
 	/*
 	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
@@ -285,12 +285,12 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			break;
 	}
 
-	if (likely((unsigned int)cpu < nr_cpu_ids)) {
+	if (likely(cpu < nr_cpu_ids)) {
 		*apicid = per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
 		return 0;
-	} else {
-		return -EINVAL;
 	}
+
+	return -EINVAL;
 }
 
 static unsigned int x2apic_get_apic_id(unsigned long x)
-- 
1.7.7.6


-- 
Regards,
Alexander Gordeev
agordeev@redhat.com

Re: [PATCH 3/6] x86/apic: Fix ugly casting and branching in cpu_mask_to_apicid_and()

[Joe Perches]

On Thu, 2012-06-14 at 09:49 +0200, Alexander Gordeev wrote:
[]
> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
[]
> @@ -2127,19 +2127,19 @@ int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
>  				   const struct cpumask *andmask,
>  				   unsigned int *apicid)
>  {
> -	int cpu;
> +	unsigned int cpu;
>  
>  	for_each_cpu_and(cpu, cpumask, andmask) {
>  		if (cpumask_test_cpu(cpu, cpu_online_mask))
>  			break;
>  	}
>  
> -	if (likely((unsigned int)cpu < nr_cpu_ids)) {
> +	if (likely(cpu < nr_cpu_ids)) {
>  		*apicid = per_cpu(x86_cpu_to_apicid, cpu);
>  		return 0;
> -	} else {
> -		return -EINVAL;
>  	}
> +
> +	return -EINVAL;

I think you should reverse the test and make the
expected common case the normal non-indented return.

	if (unlikely(cpu >= nr_cpu_ids))
		return -EINVAL;

	*apicid = per_cpu(x86_cpu_to_apicid, cpu);
	return 0;
}

Perhaps the unlikely isn't necessary.

> diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
[]
> @@ -285,12 +285,12 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
>  			break;
>  	}
>  
> -	if (likely((unsigned int)cpu < nr_cpu_ids)) {
> +	if (likely(cpu < nr_cpu_ids)) {
>  		*apicid = per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
>  		return 0;
> -	} else {
> -		return -EINVAL;
>  	}
> +
> +	return -EINVAL;

here too

[tip:x86/apic] x86/apic: Fix ugly casting and branching in cpu_mask_to_apicid_and()

[tip-bot for Alexander Gordeev]

Commit-ID:  ea3807ea52a53f2cdfd60c89d8491fc9a8208d1c
Gitweb:     http://git.kernel.org/tip/ea3807ea52a53f2cdfd60c89d8491fc9a8208d1c
Author:     Alexander Gordeev <agordeev@redhat.com>
AuthorDate: Thu, 14 Jun 2012 09:49:55 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 14 Jun 2012 12:53:14 +0200

x86/apic: Fix ugly casting and branching in cpu_mask_to_apicid_and()

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120614074954.GF3383@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/apic/apic.c        |    8 ++++----
 arch/x86/kernel/apic/es7000_32.c   |    2 +-
 arch/x86/kernel/apic/summit_32.c   |    2 +-
 arch/x86/kernel/apic/x2apic_uv_x.c |    8 ++++----
 4 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 048a4f8..c421512 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2127,19 +2127,19 @@ int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 				   const struct cpumask *andmask,
 				   unsigned int *apicid)
 {
-	int cpu;
+	unsigned int cpu;
 
 	for_each_cpu_and(cpu, cpumask, andmask) {
 		if (cpumask_test_cpu(cpu, cpu_online_mask))
 			break;
 	}
 
-	if (likely((unsigned int)cpu < nr_cpu_ids)) {
+	if (likely(cpu < nr_cpu_ids)) {
 		*apicid = per_cpu(x86_cpu_to_apicid, cpu);
 		return 0;
-	} else {
-		return -EINVAL;
 	}
+
+	return -EINVAL;
 }
 
 /*
diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 2c5317e..effece2 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -529,7 +529,7 @@ static inline int
 es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
-	int cpu, uninitialized_var(apicid);
+	unsigned int cpu, uninitialized_var(apicid);
 
 	/*
 	 * The cpus in the mask must all be on the apic cluster.
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index bbad180..b53fd6c 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -267,7 +267,7 @@ static inline int
 summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
-	int cpu, apicid = 0;
+	unsigned int cpu, apicid = 0;
 
 	/*
 	 * The cpus in the mask must all be on the apic cluster.
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 026de01..8cfade9 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -274,7 +274,7 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			  const struct cpumask *andmask,
 			  unsigned int *apicid)
 {
-	int cpu;
+	int unsigned cpu;
 
 	/*
 	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
@@ -285,12 +285,12 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			break;
 	}
 
-	if (likely((unsigned int)cpu < nr_cpu_ids)) {
+	if (likely(cpu < nr_cpu_ids)) {
 		*apicid = per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
 		return 0;
-	} else {
-		return -EINVAL;
 	}
+
+	return -EINVAL;
 }
 
 static unsigned int x2apic_get_apic_id(unsigned long x)

[PATCH 4/6] x86/apic/es7000+summit: Fix compile warning in cpu_mask_to_apicid()

[Alexander Gordeev]

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
 arch/x86/kernel/apic/es7000_32.c |    2 +-
 arch/x86/kernel/apic/summit_32.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index effece2..0c1347d 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -554,8 +554,8 @@ es7000_cpu_mask_to_apicid_and(const struct cpumask *inmask,
 			      const struct cpumask *andmask,
 			      unsigned int *apicid)
 {
-	*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 	cpumask_var_t cpumask;
+	*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 
 	if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
 		return 0;
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index b53fd6c..e6cc182 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -291,8 +291,8 @@ summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
 			      const struct cpumask *andmask,
 			      unsigned int *apicid)
 {
-	*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 	cpumask_var_t cpumask;
+	*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 
 	if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
 		return 0;
-- 
1.7.7.6


-- 
Regards,
Alexander Gordeev
agordeev@redhat.com

[tip:x86/apic] x86/apic/es7000+summit: Fix compile warning in cpu_mask_to_apicid()

[tip-bot for Alexander Gordeev]

Commit-ID:  49ad3fd4834182cce9725abb98e080b479fed464
Gitweb:     http://git.kernel.org/tip/49ad3fd4834182cce9725abb98e080b479fed464
Author:     Alexander Gordeev <agordeev@redhat.com>
AuthorDate: Thu, 14 Jun 2012 09:50:11 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 14 Jun 2012 12:53:15 +0200

x86/apic/es7000+summit: Fix compile warning in cpu_mask_to_apicid()

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120614075010.GG3383@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/apic/es7000_32.c |    2 +-
 arch/x86/kernel/apic/summit_32.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index effece2..0c1347d 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -554,8 +554,8 @@ es7000_cpu_mask_to_apicid_and(const struct cpumask *inmask,
 			      const struct cpumask *andmask,
 			      unsigned int *apicid)
 {
-	*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 	cpumask_var_t cpumask;
+	*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 
 	if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
 		return 0;
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index b53fd6c..e6cc182 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -291,8 +291,8 @@ summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
 			      const struct cpumask *andmask,
 			      unsigned int *apicid)
 {
-	*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 	cpumask_var_t cpumask;
+	*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 
 	if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
 		return 0;

[PATCH 5/6] x86/apic/es7000+summit: Always make valid apicid from a cpumask

[Alexander Gordeev]

In case of invalid parameters cpu_mask_to_apicid_and() might return
apicid value of 0 (on Summit) or a uninitialized value (on ES7000),
although it is supposed to return apicid of cpu-0 at least. Fix the
operation to always return a valid apicid.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
 arch/x86/kernel/apic/es7000_32.c |    2 ++
 arch/x86/kernel/apic/summit_32.c |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 0c1347d..9882093 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -545,6 +545,8 @@ es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 		apicid = new_apicid;
 		round++;
 	}
+	if (!round)
+		return -EINVAL;
 	*dest_id = apicid;
 	return 0;
 }
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index e6cc182..b6e6185 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -282,6 +282,8 @@ summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 		apicid |= new_apicid;
 		round++;
 	}
+	if (!round)
+		return -EINVAL;
 	*dest_id = apicid;
 	return 0;
 }
-- 
1.7.7.6


-- 
Regards,
Alexander Gordeev
agordeev@redhat.com

[tip:x86/apic] x86/apic/es7000+summit: Always make valid apicid from a cpumask

[tip-bot for Alexander Gordeev]

Commit-ID:  214e270b5f5f6a85400a817d5305c797b2b7467a
Gitweb:     http://git.kernel.org/tip/214e270b5f5f6a85400a817d5305c797b2b7467a
Author:     Alexander Gordeev <agordeev@redhat.com>
AuthorDate: Thu, 14 Jun 2012 09:50:27 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 14 Jun 2012 12:53:15 +0200

x86/apic/es7000+summit: Always make valid apicid from a cpumask

In case of invalid parameters cpu_mask_to_apicid_and() might
return apicid value of 0 (on Summit) or a uninitialized value
(on ES7000), although it is supposed to return apicid of cpu-0
at least. Fix the operation to always return a valid apicid.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120614075026.GH3383@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/apic/es7000_32.c |    2 ++
 arch/x86/kernel/apic/summit_32.c |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 0c1347d..9882093 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -545,6 +545,8 @@ es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 		apicid = new_apicid;
 		round++;
 	}
+	if (!round)
+		return -EINVAL;
 	*dest_id = apicid;
 	return 0;
 }
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index e6cc182..b6e6185 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -282,6 +282,8 @@ summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 		apicid |= new_apicid;
 		round++;
 	}
+	if (!round)
+		return -EINVAL;
 	*dest_id = apicid;
 	return 0;
 }

[PATCH 6/6] x86/apic/es7000: Make apicid of a cluster (not CPU) from a cpumask

[Alexander Gordeev]

cpu_mask_to_apicid_and() always returns apicid of a single CPU, even in
case multiple CPUs were requested. This update fixes a typo and forces
apicid of a cluster to be returned.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
 arch/x86/kernel/apic/es7000_32.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 9882093..0874799 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -542,7 +542,7 @@ es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 
 			return -EINVAL;
 		}
-		apicid = new_apicid;
+		apicid |= new_apicid;
 		round++;
 	}
 	if (!round)
-- 
1.7.7.6


-- 
Regards,
Alexander Gordeev
agordeev@redhat.com

[tip:x86/apic] x86/apic/es7000: Make apicid of a cluster (not CPU) from a cpumask

[tip-bot for Alexander Gordeev]

Commit-ID:  5a0a2a308113086cc800a203d903271c9caa1611
Gitweb:     http://git.kernel.org/tip/5a0a2a308113086cc800a203d903271c9caa1611
Author:     Alexander Gordeev <agordeev@redhat.com>
AuthorDate: Thu, 14 Jun 2012 09:50:44 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 14 Jun 2012 12:53:16 +0200

x86/apic/es7000: Make apicid of a cluster (not CPU) from a cpumask

cpu_mask_to_apicid_and() always returns apicid of a single CPU,
even in case multiple CPUs were requested. This update fixes a
typo and forces apicid of a cluster to be returned.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120614075043.GI3383@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/apic/es7000_32.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 9882093..0874799 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -542,7 +542,7 @@ es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 
 			return -EINVAL;
 		}
-		apicid = new_apicid;
+		apicid |= new_apicid;
 		round++;
 	}
 	if (!round)