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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-01-07 13:41:40 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-01-07 15:55:45 +0100 |
| commit | c9b5f501ef1580faa30c40c644b7691870462201 (patch) | |
| tree | d22df12b72bc90b130254078ee71b1b7e7e3e521 /kernel | |
| parent | 524429c31b486c05449666b94613f59f729c0a84 (diff) | |
| download | lwn-c9b5f501ef1580faa30c40c644b7691870462201.tar.gz lwn-c9b5f501ef1580faa30c40c644b7691870462201.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/manage.c | 2 | ||||
| -rw-r--r-- | kernel/kthread.c | 2 | ||||
| -rw-r--r-- | kernel/softirq.c | 2 | ||||
| -rw-r--r-- | kernel/trace/trace_selftest.c | 2 |
4 files changed, 4 insertions, 4 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 91a5fa25054e..0caa59f747dd 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 5355cfd44a3f..c55afba990a3 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 d4d918a91881..c10150cb456b 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 562c56e048fd..659732eba07c 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, ¶m); |