Commit-ID: 48d906bf09854692da73b07db371ef1fb13d1b1b
Gitweb: http://git.kernel.org/tip/48d906bf09854692da73b07db371ef1fb13d1b1b
Author: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
AuthorDate: Wed, 20 Oct 2010 16:01:12 -0700
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sat, 23 Oct 2010 10:18:23 +0200
sched: Make sched_param argument static in sched_setscheduler() callers
Andrew Morton pointed out almost all sched_setscheduler() callers are
using fixed parameters and can be converted to static. It reduces runtime
memory use a little.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Reported-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Acked-by: James Morris <jmorris@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/sched.h | 5 +++--
kernel/irq/manage.c | 4 +++-
kernel/kthread.c | 2 +-
kernel/sched.c | 6 +++---
kernel/softirq.c | 4 +++-
kernel/trace/trace_selftest.c | 2 +-
kernel/watchdog.c | 2 +-
7 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 56154bb..d22b242 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1945,9 +1945,10 @@ extern int task_nice(const struct task_struct *p);
extern int can_nice(const struct task_struct *p, const int nice);
extern int task_curr(const struct task_struct *p);
extern int idle_cpu(int cpu);
-extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
+extern int sched_setscheduler(struct task_struct *, int,
+ const struct sched_param *);
extern int sched_setscheduler_nocheck(struct task_struct *, int,
- struct sched_param *);
+ const struct sched_param *);
extern struct task_struct *idle_task(int cpu);
extern struct task_struct *curr_task(int cpu);
extern void set_curr_task(int cpu, struct task_struct *p);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 644e8d5..850f030 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -573,7 +573,9 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
*/
static int irq_thread(void *data)
{
- struct sched_param param = { .sched_priority = MAX_USER_RT_PRIO/2, };
+ static struct sched_param param = {
+ .sched_priority = MAX_USER_RT_PRIO/2,
+ };
struct irqaction *action = data;
struct irq_desc *desc = irq_to_desc(action->irq);
int wake, oneshot = desc->status & IRQ_ONESHOT;
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 2dc3786..74cf6f5 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -148,7 +148,7 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
wait_for_completion(&create.done);
if (!IS_ERR(create.result)) {
- struct sched_param param = { .sched_priority = 0 };
+ static struct sched_param param = { .sched_priority = 0 };
va_list args;
va_start(args, namefmt);
diff --git a/kernel/sched.c b/kernel/sched.c
index d42992b..51944e8 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4701,7 +4701,7 @@ static bool check_same_owner(struct task_struct *p)
}
static int __sched_setscheduler(struct task_struct *p, int policy,
- struct sched_param *param, bool user)
+ const struct sched_param *param, bool user)
{
int retval, oldprio, oldpolicy = -1, on_rq, running;
unsigned long flags;
@@ -4856,7 +4856,7 @@ recheck:
* NOTE that the task may be already dead.
*/
int sched_setscheduler(struct task_struct *p, int policy,
- struct sched_param *param)
+ const struct sched_param *param)
{
return __sched_setscheduler(p, policy, param, true);
}
@@ -4874,7 +4874,7 @@ EXPORT_SYMBOL_GPL(sched_setscheduler);
* but our caller might not have that capability.
*/
int sched_setscheduler_nocheck(struct task_struct *p, int policy,
- struct sched_param *param)
+ const struct sched_param *param)
{
return __sched_setscheduler(p, policy, param, false);
}
diff --git a/kernel/softirq.c b/kernel/softirq.c
index fc97888..081869e 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -851,7 +851,9 @@ static int __cpuinit cpu_callback(struct notifier_block *nfb,
cpumask_any(cpu_online_mask));
case CPU_DEAD:
case CPU_DEAD_FROZEN: {
- struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
+ static struct sched_param param = {
+ .sched_priority = MAX_RT_PRIO-1
+ };
p = per_cpu(ksoftirqd, hotcpu);
per_cpu(ksoftirqd, hotcpu) = NULL;
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 155a415..562c56e 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -558,7 +558,7 @@ trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr)
static int trace_wakeup_test_thread(void *data)
{
/* Make this a RT thread, doesn't need to be too high */
- struct sched_param param = { .sched_priority = 5 };
+ static struct sched_param param = { .sched_priority = 5 };
struct completion *x = data;
sched_setscheduler(current, SCHED_FIFO, ¶m);
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index bafba68..94ca779 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -307,7 +307,7 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
*/
static int watchdog(void *unused)
{
- struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
+ static struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
struct hrtimer *hrtimer = &__raw_get_cpu_var(watchdog_hrtimer);
sched_setscheduler(current, SCHED_FIFO, ¶m);
--
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