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Commit a364092a authored by Arjan van de Ven's avatar Arjan van de Ven
Browse files

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: default avatarArjan van de Ven <arjan@linux.intel.com>
Acked-by: default avatarNeilBrown <neilb@suse.de>
parent 82cbc11a

drivers/md/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -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

init/do_mounts_md.c

+9 −2
Original line number Diff line number Diff line
@@ -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();