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alistair23-linux/init
Paul Gortmaker 4dfe694f61 init: make rootdelay=N consistent with rootwait behaviour
Currently rootdelay=N and rootwait behave differently (aside from the
obvious unbounded wait duration) because they are at different places in
the init sequence.

The difference manifests itself for md devices because the call to
md_run_setup() lives between rootdelay and rootwait, so if you try to use
rootdelay=20 to try and allow a slow RAID0 array to assemble, you get
this:

[    4.526011] sd 6:0:0:0: [sdc] Attached SCSI removable disk
[   22.972079] md: Waiting for all devices to be available before autodetect

i.e.  you've achieved nothing other than delaying the probing 20s, when
what you wanted was a 20s delay _after_ the probing for md devices was
initiated.

Here we move the rootdelay code to be right beside the rootwait code, so
that their behaviour is consistent.

It should be noted that in doing so, the actions based on the
saved_root_name[0] and initrd_load() were previously put on hold by
rootdelay=N and now currently will not be delayed.  However, I think
consistent behaviour is more important than matching historical behaviour
of delaying the above two operations.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08 15:57:18 -07:00
..
Kconfig printk: allow increasing the ring buffer depending on the number of CPUs 2014-08-06 18:01:23 -07:00
Makefile init_task: Replace CONFIG_HAVE_GENERIC_INIT_TASK 2012-05-05 13:00:46 +02:00
calibrate.c kernel: delete __cpuinit usage from all core kernel files 2013-07-14 19:36:59 -04:00
do_mounts.c init: make rootdelay=N consistent with rootwait behaviour 2014-08-08 15:57:18 -07:00
do_mounts.h md: move lots of #include lines out of .h files and into .c 2009-03-31 14:33:13 +11:00
do_mounts_initrd.c usermodehelper: split remaining calls to call_usermodehelper_fns() 2013-04-30 17:04:06 -07:00
do_mounts_md.c init: disable sparse checking of the mount.o source files 2012-05-31 17:49:27 -07:00
do_mounts_rd.c cramfs: take headers to fs/cramfs 2014-01-25 03:13:02 -05:00
init_task.c sched/rt: Move rt specific bits into new header file 2013-02-07 20:51:08 +01:00
initramfs.c initramfs: debug detected compression method 2014-04-07 16:36:11 -07:00
main.c Most of this is cleaning up various driver sysfs permissions so we can 2014-06-11 16:09:14 -07:00
noinitramfs.c init: mark __user address space on string literals 2010-10-26 16:52:15 -07:00
version.c proc: Split the namespace stuff out into linux/proc_ns.h 2013-05-01 17:29:39 -04:00