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Commit 55dc7db7 authored Sep 01, 2008 by Tejun Heo Committed by Jens Axboe Oct 09, 2008

init: DEBUG_BLOCK_EXT_DEVT requires explicit root= param



DEBUG_BLOCK_EXT_DEVT shuffles SCSI and IDE device numbers and root
device number set using rdev become meaningless.  Root devices should
be explicitly specified using textual names.  Warn about it if root
can't be found and DEBUG_BLOCK_EXT_DEVT is enabled.  Also, add warning
to the help text.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

parent 2bbedcb4

init/do_mounts.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -263,6 +263,10 @@ void __init mount_block_root(char *name, int flags)
		printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");

		printk_all_partitions();
		#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
		printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
		"explicit textual name for \"root=\" boot option.\n");
		#endif
		panic("VFS: Unable to mount root fs on %s", b);
		}

lib/Kconfig.debug

+6 −0

Original line number	Diff line number	Diff line
		@@ -638,6 +638,12 @@ config DEBUG_BLOCK_EXT_DEVT
		userland code paths which assume predetermined contiguous
		device number allocation.

		Note that turning on this debug option shuffles all the
		device numbers for all IDE and SCSI devices including libata
		ones, so root partition specified using device number
		directly (via rdev or root=MAJ:MIN) won't work anymore.
		Textual device names (root=/dev/sdXn) will continue to work.

		Say N if you are unsure.

		config LKDTM