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Commit 2737c49f authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
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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: default avatarAndreas Sundebo <kernel@sundebo.dk>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Tested-by: default avatarAndreas Sundebo <kernel@sundebo.dk>

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ddb6c9b5

kernel/time/timer_stats.c

+3 −3
Original line number Diff line number Diff line
@@ -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;

}