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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-01-07 13:41:40 +0100
committerIngo Molnar <mingo@elte.hu>2011-01-07 15:55:45 +0100
commitc9b5f501ef1580faa30c40c644b7691870462201 (patch)
treed22df12b72bc90b130254078ee71b1b7e7e3e521
parent524429c31b486c05449666b94613f59f729c0a84 (diff)
sched: Constify function scope static struct sched_param usage
Function-scope statics are discouraged because they are easily overlooked and can cause subtle bugs/races due to their global (non-SMP safe) nature. Linus noticed that we did this for sched_param - at minimum make the const. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: Message-ID: <AANLkTinotRxScOHEb0HgFgSpGPkq_6jKTv5CfvnQM=ee@mail.gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/irq/manage.c2
-rw-r--r--kernel/kthread.c2
-rw-r--r--kernel/softirq.c2
-rw-r--r--kernel/trace/trace_selftest.c2
4 files changed, 4 insertions, 4 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 91a5fa25054..0caa59f747d 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -577,7 +577,7 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
*/
static int irq_thread(void *data)
{
- static struct sched_param param = {
+ static const struct sched_param param = {
.sched_priority = MAX_USER_RT_PRIO/2,
};
struct irqaction *action = data;
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 5355cfd44a3..c55afba990a 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)) {
- static struct sched_param param = { .sched_priority = 0 };
+ static const struct sched_param param = { .sched_priority = 0 };
va_list args;
va_start(args, namefmt);
diff --git a/kernel/softirq.c b/kernel/softirq.c
index d4d918a9188..c10150cb456 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -853,7 +853,7 @@ static int __cpuinit cpu_callback(struct notifier_block *nfb,
cpumask_any(cpu_online_mask));
case CPU_DEAD:
case CPU_DEAD_FROZEN: {
- static struct sched_param param = {
+ static const struct sched_param param = {
.sched_priority = MAX_RT_PRIO-1
};
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 562c56e048f..659732eba07 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 */
- static struct sched_param param = { .sched_priority = 5 };
+ static const struct sched_param param = { .sched_priority = 5 };
struct completion *x = data;
sched_setscheduler(current, SCHED_FIFO, &param);