path: root/block
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authorTejun Heo <tj@kernel.org>2013-01-18 14:05:56 -0800
committerTejun Heo <tj@kernel.org>2013-01-18 14:05:56 -0800
commitbb813f4c933ae9f887a014483690d5f8b8ec05e1 (patch)
tree04107b0ae2d1881960dea63b623915db159ecacc /block
parent84b233adcca3cacd5cfa8013a5feda7a3db4a9af (diff)
init, block: try to load default elevator module early during boot
This patch adds default module loading and uses it to load the default block elevator. During boot, it's called right after initramfs or initrd is made available and right before control is passed to userland. This ensures that as long as the modules are available in the usual places in initramfs, initrd or the root filesystem, the default modules are loaded as soon as possible. This will replace the on-demand elevator module loading from elevator init path. v2: Fixed build breakage when !CONFIG_BLOCK. Reported by kbuild test robot. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Alex Riesen <raa.lkml@gmail.com> Cc: Fengguang We <fengguang.wu@intel.com>
Diffstat (limited to 'block')
1 files changed, 16 insertions, 0 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 9edba1b8323..c2d61d56e0b 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -136,6 +136,22 @@ static int __init elevator_setup(char *str)
__setup("elevator=", elevator_setup);
+/* called during boot to load the elevator chosen by the elevator param */
+void __init load_default_elevator_module(void)
+ struct elevator_type *e;
+ if (!chosen_elevator[0])
+ return;
+ spin_lock(&elv_list_lock);
+ e = elevator_find(chosen_elevator);
+ spin_unlock(&elv_list_lock);
+ if (!e)
+ request_module("%s-iosched", chosen_elevator);
static struct kobj_type elv_ktype;
static struct elevator_queue *elevator_alloc(struct request_queue *q,