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| author | Arjan van de Ven <arjan@linux.intel.com> | 2008-09-21 15:44:32 -0700 |
|---|---|---|
| committer | Arjan van de Ven <arjan@linux.intel.com> | 2008-10-12 08:25:02 -0700 |
| commit | a364092a412975e506415f77f0628cbdd28c3913 (patch) | |
| tree | 98d7d66e8658c9959b2961f0b40356e981277395 | |
| parent | 82cbc11a4146d6a8acd81f81f7fe17387668107f (diff) | |
| download | kernel_samsung_aries-a364092a412975e506415f77f0628cbdd28c3913.zip kernel_samsung_aries-a364092a412975e506415f77f0628cbdd28c3913.tar.gz kernel_samsung_aries-a364092a412975e506415f77f0628cbdd28c3913.tar.bz2 | |
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>
| -rw-r--r-- | drivers/md/Kconfig | 14 | ||||
| -rw-r--r-- | init/do_mounts_md.c | 11 |
2 files changed, 23 insertions, 2 deletions
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 @@ config BLK_DEV_MD 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 diff --git a/init/do_mounts_md.c b/init/do_mounts_md.c index c0dfd3c..48b3fad 100644 --- a/init/do_mounts_md.c +++ b/init/do_mounts_md.c @@ -12,7 +12,12 @@ * The code for that is here. */ -static int __initdata raid_noautodetect, raid_autopart; +#ifdef CONFIG_MD_AUTODETECT +static int __initdata raid_noautodetect; +#else +static int __initdata raid_noautodetect=1; +#endif +static int __initdata raid_autopart; static struct { int minor; @@ -252,6 +257,8 @@ static int __init raid_setup(char *str) if (!strncmp(str, "noautodetect", wlen)) raid_noautodetect = 1; + if (!strncmp(str, "autodetect", wlen)) + raid_noautodetect = 0; if (strncmp(str, "partitionable", wlen)==0) raid_autopart = 1; if (strncmp(str, "part", wlen)==0) @@ -288,7 +295,7 @@ void __init md_run_setup(void) create_dev("/dev/md0", MKDEV(MD_MAJOR, 0)); if (raid_noautodetect) - printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n"); + printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n"); else autodetect_raid(); md_setup_drive(); |