raid: make RAID autodetect default a KConfig option
RAID autodetect has the side effect of requiring synchronisation
of all device drivers, which can make the boot several seconds longer
(I've measured 7 on one of my laptops).... even for systems that don't
have RAID setup for the root filesystem (the only FS where this matters).
This patch makes the default for autodetect a config option; either way
the user can always override via the kernel command line.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 07d92c1..8e72c91 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -30,6 +30,20 @@
If unsure, say N.
+config MD_AUTODETECT
+ bool "Autodetect RAID arrays during kernel boot"
+ depends on BLK_DEV_MD
+ default y
+ ---help---
+ If you say Y here, then the kernel will try to autodetect raid
+ arrays as part of its boot process.
+
+ If you don't use raid and say Y, this autodetection can cause
+ a several-second delay in the boot time due to various
+ synchronisation steps that are part of this step.
+
+ If unsure, say Y.
+
config MD_LINEAR
tristate "Linear (append) mode"
depends on BLK_DEV_MD