[PATCH V2 0/3] sched: Minor cleanups

[PATCH V2 0/3] sched: Minor cleanups

[Viresh Kumar]

Hi,

Avoid reinitializing memory which is already set to zero.

V1->V2:
- Don't remove field initializers from 2nd and 3rd patch.
- Drop 4th patch (sched: core: drop useless expression from sched_init()).

--
viresh

Viresh Kumar (3):
  sched: topology: drop memset() from init_rootdomain()
  sched: cpudeadline: don't re-initialize struct cpudl
  sched: cpupri: don't re-initialize struct cpupri

 kernel/sched/cpudeadline.c | 1 -
 kernel/sched/cpupri.c      | 2 --
 kernel/sched/topology.c    | 4 +---
 3 files changed, 1 insertion(+), 6 deletions(-)

-- 
2.12.0.432.g71c3a4f4ba37

[PATCH V2 1/3] sched: topology: drop memset() from init_rootdomain()

[Viresh Kumar]

There are only two callers of init_rootdomain(). One of them passes a
global to it and another one sends dynamically allocated root-domain.

There is no need to memset the root-domain in the first case as the
structure is already reset.

Update alloc_rootdomain() to allocate the memory with kzalloc() and
remove the memset() call from init_rootdomain().

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 kernel/sched/topology.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 1b0b4fb12837..a2497702e628 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -242,8 +242,6 @@ void rq_attach_root(struct rq *rq, struct root_domain *rd)
 
 static int init_rootdomain(struct root_domain *rd)
 {
-	memset(rd, 0, sizeof(*rd));
-
 	if (!zalloc_cpumask_var(&rd->span, GFP_KERNEL))
 		goto out;
 	if (!zalloc_cpumask_var(&rd->online, GFP_KERNEL))
@@ -292,7 +290,7 @@ static struct root_domain *alloc_rootdomain(void)
 {
 	struct root_domain *rd;
 
-	rd = kmalloc(sizeof(*rd), GFP_KERNEL);
+	rd = kzalloc(sizeof(*rd), GFP_KERNEL);
 	if (!rd)
 		return NULL;
 
-- 
2.12.0.432.g71c3a4f4ba37

[PATCH V2 2/3] sched: cpudeadline: don't re-initialize struct cpudl

[Viresh Kumar]

The struct cpudl passed to cpudl_init() is already initialized to zero.
Don't do that again.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 kernel/sched/cpudeadline.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c
index fba235c7d026..bdf448b6556f 100644
--- a/kernel/sched/cpudeadline.c
+++ b/kernel/sched/cpudeadline.c
@@ -246,7 +246,6 @@ int cpudl_init(struct cpudl *cp)
 {
 	int i;
 
-	memset(cp, 0, sizeof(*cp));
 	raw_spin_lock_init(&cp->lock);
 	cp->size = 0;
 
-- 
2.12.0.432.g71c3a4f4ba37

[PATCH V2 3/3] sched: cpupri: don't re-initialize struct cpupri

[Viresh Kumar]

The struct cpupri passed to cpupri_init() is already initialized to
zero. Don't do that again.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 kernel/sched/cpupri.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c
index 981fcd7dc394..2511aba36b89 100644
--- a/kernel/sched/cpupri.c
+++ b/kernel/sched/cpupri.c
@@ -209,8 +209,6 @@ int cpupri_init(struct cpupri *cp)
 {
 	int i;
 
-	memset(cp, 0, sizeof(*cp));
-
 	for (i = 0; i < CPUPRI_NR_PRIORITIES; i++) {
 		struct cpupri_vec *vec = &cp->pri_to_cpu[i];
 
-- 
2.12.0.432.g71c3a4f4ba37

[tip:sched/core] sched/topology: Drop memset() from init_rootdomain()

[tip-bot for Viresh Kumar]

Commit-ID:  4d13a06d54c415238325b0fe2c14f1052da4512f
Gitweb:     http://git.kernel.org/tip/4d13a06d54c415238325b0fe2c14f1052da4512f
Author:     Viresh Kumar <viresh.kumar@linaro.org>
AuthorDate: Thu, 13 Apr 2017 14:45:48 +0530
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 10 Aug 2017 12:18:13 +0200

sched/topology: Drop memset() from init_rootdomain()

There are only two callers of init_rootdomain(). One of them passes a
global to it and another one sends dynamically allocated root-domain.

There is no need to memset the root-domain in the first case as the
structure is already reset.

Update alloc_rootdomain() to allocate the memory with kzalloc() and
remove the memset() call from init_rootdomain().

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: linaro-kernel@lists.linaro.org
Link: http://lkml.kernel.org/r/fc2f6cc90b098040970c85a97046512572d765bc.1492065513.git.viresh.kumar@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/sched/topology.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 79895ae..216fee0 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -261,8 +261,6 @@ void rq_attach_root(struct rq *rq, struct root_domain *rd)
 
 static int init_rootdomain(struct root_domain *rd)
 {
-	memset(rd, 0, sizeof(*rd));
-
 	if (!zalloc_cpumask_var(&rd->span, GFP_KERNEL))
 		goto out;
 	if (!zalloc_cpumask_var(&rd->online, GFP_KERNEL))
@@ -311,7 +309,7 @@ static struct root_domain *alloc_rootdomain(void)
 {
 	struct root_domain *rd;
 
-	rd = kmalloc(sizeof(*rd), GFP_KERNEL);
+	rd = kzalloc(sizeof(*rd), GFP_KERNEL);
 	if (!rd)
 		return NULL;
 

[tip:sched/core] sched/deadline: Don't re-initialize 'struct cpudl'

[tip-bot for Viresh Kumar]

Commit-ID:  42d394d41ab90f4ed9d7a7403ed22e8f7590948a
Gitweb:     http://git.kernel.org/tip/42d394d41ab90f4ed9d7a7403ed22e8f7590948a
Author:     Viresh Kumar <viresh.kumar@linaro.org>
AuthorDate: Thu, 13 Apr 2017 14:45:49 +0530
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 10 Aug 2017 12:18:13 +0200

sched/deadline: Don't re-initialize 'struct cpudl'

The 'struct cpudl' passed to cpudl_init() is already initialized to zero.
Don't do that again.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: linaro-kernel@lists.linaro.org
Link: http://lkml.kernel.org/r/bd4c229806bc96694b15546207afcc221387d2f5.1492065513.git.viresh.kumar@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/sched/cpudeadline.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c
index fba235c..bdf448b 100644
--- a/kernel/sched/cpudeadline.c
+++ b/kernel/sched/cpudeadline.c
@@ -246,7 +246,6 @@ int cpudl_init(struct cpudl *cp)
 {
 	int i;
 
-	memset(cp, 0, sizeof(*cp));
 	raw_spin_lock_init(&cp->lock);
 	cp->size = 0;
 

[tip:sched/core] sched/cpupri: Don't re-initialize 'struct cpupri'

[tip-bot for Viresh Kumar]

Commit-ID:  1c2a4861dbfca373fea1ff2cf9e9793933d024ce
Gitweb:     http://git.kernel.org/tip/1c2a4861dbfca373fea1ff2cf9e9793933d024ce
Author:     Viresh Kumar <viresh.kumar@linaro.org>
AuthorDate: Thu, 13 Apr 2017 14:45:50 +0530
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 10 Aug 2017 12:18:14 +0200

sched/cpupri: Don't re-initialize 'struct cpupri'

The 'struct cpupri' passed to cpupri_init() is already initialized to
zero. Don't do that again.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: linaro-kernel@lists.linaro.org
Link: http://lkml.kernel.org/r/8a71d48c5a077500b6ddc1a41484c0ac8d3aad94.1492065513.git.viresh.kumar@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/sched/cpupri.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c
index 981fcd7..2511aba 100644
--- a/kernel/sched/cpupri.c
+++ b/kernel/sched/cpupri.c
@@ -209,8 +209,6 @@ int cpupri_init(struct cpupri *cp)
 {
 	int i;
 
-	memset(cp, 0, sizeof(*cp));
-
 	for (i = 0; i < CPUPRI_NR_PRIORITIES; i++) {
 		struct cpupri_vec *vec = &cp->pri_to_cpu[i];