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make elv_register() output atomic 

Booting 2.6.21-rc3-g45592145 I noticed the following on one of my
machines in the bootlog:

io scheduler noop registered<6>Time: jiffies clocksource has been installed.

io scheduler deadline registered (default)

Looking at block/elevator.c, it appears that elv_register() uses two
consecutive printks in a non-atomic way, leading to the above glitch. The
attached trivial patch fixes this issue, by using a single printk.

Signed-off-by: Thibaut VARENE <varenet@parisc-linux.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Thibaut VARENE 2007-03-15 12:59:19 +01:00 committed by Jens Axboe
parent f772b3d9ca
commit 1ffb96c587
1 changed files with 4 additions and 3 deletions
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7
block/elevator.c
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@ -964,17 +964,18 @@ void elv_unregister_queue(struct request_queue *q)
int elv_register(struct elevator_type *e)
{
char *def = "";
spin_lock_irq(&elv_list_lock);
BUG_ON(elevator_find(e->elevator_name));
list_add_tail(&e->list, &elv_list);
spin_unlock_irq(&elv_list_lock);
printk(KERN_INFO "io scheduler %s registered", e->elevator_name);
if (!strcmp(e->elevator_name, chosen_elevator) ||
(!*chosen_elevator &&
!strcmp(e->elevator_name, CONFIG_DEFAULT_IOSCHED)))
printk(" (default)");
printk("\n");
def = " (default)";
printk(KERN_INFO "io scheduler %s registered%s\n", e->elevator_name, def);
return 0;
}
EXPORT_SYMBOL_GPL(elv_register);