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authorTejun Heo <tj@kernel.org>2013-01-19 02:05:56 +0400
committerTejun Heo <tj@kernel.org>2013-01-19 02:05:56 +0400
commitbb813f4c933ae9f887a014483690d5f8b8ec05e1 (patch)
tree04107b0ae2d1881960dea63b623915db159ecacc /include/linux/elevator.h
parent84b233adcca3cacd5cfa8013a5feda7a3db4a9af (diff)
downloadlinux-bb813f4c933ae9f887a014483690d5f8b8ec05e1.tar.xz
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 'include/linux/elevator.h')
-rw-r--r--include/linux/elevator.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index c03af7687bb4..186620631750 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -138,6 +138,7 @@ extern void elv_drain_elevator(struct request_queue *);
/*
* io scheduler registration
*/
+extern void __init load_default_elevator_module(void);
extern int elv_register(struct elevator_type *);
extern void elv_unregister(struct elevator_type *);
@@ -206,5 +207,9 @@ enum {
INIT_LIST_HEAD(&(rq)->csd.list); \
} while (0)
+#else /* CONFIG_BLOCK */
+
+static inline void load_default_elevator_module(void) { }
+
#endif /* CONFIG_BLOCK */
#endif