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locking, timer_stats: Annotate table_lock as raw 

The table_lock lock can be taken in atomic context 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.

Reported-by: Andreas Sundebo <kernel@sundebo.dk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Andreas Sundebo <kernel@sundebo.dk>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2010-06-16 16:58:34 +02:00 committed by Ingo Molnar
parent ddb6c9b58a
commit 2737c49f29
1 changed files with 3 additions and 3 deletions
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6
kernel/time/timer_stats.c
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@ -81,7 +81,7 @@ struct entry {
/*
* Spinlock protecting the tables - not taken during lookup:
*/
static DEFINE_SPINLOCK(table_lock);
static DEFINE_RAW_SPINLOCK(table_lock);
/*
* Per-CPU lookup locks for fast hash lookup:
@ -188,7 +188,7 @@ static struct entry *tstat_lookup(struct entry *entry, char *comm)
prev = NULL;
curr = *head;
spin_lock(&table_lock);
raw_spin_lock(&table_lock);
/*
* Make sure we have not raced with another CPU:
*/
@ -215,7 +215,7 @@ static struct entry *tstat_lookup(struct entry *entry, char *comm)
*head = curr;
}
out_unlock:
spin_unlock(&table_lock);
raw_spin_unlock(&table_lock);
return curr;
}