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locking, latencytop: Annotate latency_lock as raw

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The latency_lock is lock can be taken in the guts of the
scheduler code and therefore cannot be preempted on -rt -
annotate it.

In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2009-09-17 17:31:09 +02:00 committed by Ingo Molnar
parent 2737c49f29
commit 757455d41c
1 changed files with 7 additions and 7 deletions
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14
kernel/latencytop.c
View file

@ -58,7 +58,7 @@
#include <linux/list.h>
#include <linux/stacktrace.h>
static DEFINE_SPINLOCK(latency_lock);
static DEFINE_RAW_SPINLOCK(latency_lock);
#define MAXLR 128
static struct latency_record latency_record[MAXLR];
@ -72,19 +72,19 @@ void clear_all_latency_tracing(struct task_struct *p)
if (!latencytop_enabled)
return;
spin_lock_irqsave(&latency_lock, flags);
raw_spin_lock_irqsave(&latency_lock, flags);
memset(&p->latency_record, 0, sizeof(p->latency_record));
p->latency_record_count = 0;
spin_unlock_irqrestore(&latency_lock, flags);
raw_spin_unlock_irqrestore(&latency_lock, flags);
}
static void clear_global_latency_tracing(void)
{
unsigned long flags;
spin_lock_irqsave(&latency_lock, flags);
raw_spin_lock_irqsave(&latency_lock, flags);
memset(&latency_record, 0, sizeof(latency_record));
spin_unlock_irqrestore(&latency_lock, flags);
raw_spin_unlock_irqrestore(&latency_lock, flags);
}
static void __sched
@ -190,7 +190,7 @@ __account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
lat.max = usecs;
store_stacktrace(tsk, &lat);
spin_lock_irqsave(&latency_lock, flags);
raw_spin_lock_irqsave(&latency_lock, flags);
account_global_scheduler_latency(tsk, &lat);
@ -231,7 +231,7 @@ __account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
memcpy(&tsk->latency_record[i], &lat, sizeof(struct latency_record));
out_unlock:
spin_unlock_irqrestore(&latency_lock, flags);
raw_spin_unlock_irqrestore(&latency_lock, flags);
}
static int lstats_show(struct seq_file *m, void *v)