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NOMMU: Fix the RomFS Kconfig to ensure at least one backing store is selected

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Fix the configuration of the RomFS to make sure that at least one 
backing store method is always selected.  This is done by rendering it 
down to a choice item that selects between Block, MTD and both.

This also works correctly in the case that CONFIG_MTD=m: MTD cannot be 
selected as a backing store unless CONFIG_ROMFS_FS is also 'm'.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Howells 2009-02-20 12:31:54 +00:00 committed by David Woodhouse
parent da4458bda2
commit f52fd5b7fd
1 changed files with 28 additions and 6 deletions
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34
fs/romfs/Kconfig
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@ -1,6 +1,6 @@
config ROMFS_FS
tristate "ROM file system support"
depends on BLOCK
depends on BLOCK || MTD
---help---
This is a very small read-only file system mainly intended for
initial ram disks of installation disks, but it could be used for
@ -15,9 +15,19 @@ config ROMFS_FS
If you don't know whether you need it, then you don't need it:
answer N.
config ROMFS_ON_BLOCK
bool "Block device-backed ROM file system support" if (ROMFS_ON_MTD && EMBEDDED)
depends on ROMFS_FS && BLOCK
#
# Select the backing stores to be supported
#
choice
prompt "RomFS backing stores"
depends on ROMFS_FS
default ROMFS_BACKED_BY_BLOCK
help
Select the backing stores to be supported.
config ROMFS_BACKED_BY_BLOCK
bool "Block device-backed ROM file system support"
depends on BLOCK
help
This permits ROMFS to use block devices buffered through the page
cache as the medium from which to retrieve data. It does not allow
@ -25,9 +35,8 @@ config ROMFS_ON_BLOCK
If unsure, answer Y.
config ROMFS_ON_MTD
config ROMFS_BACKED_BY_MTD
bool "MTD-backed ROM file system support"
depends on ROMFS_FS
depends on MTD=y || (ROMFS_FS=m && MTD)
help
This permits ROMFS to use MTD based devices directly, without the
@ -38,3 +47,16 @@ config ROMFS_ON_MTD
If unsure, answer Y.
config ROMFS_BACKED_BY_BOTH
bool "Both the above"
depends on BLOCK && (MTD=y || (ROMFS_FS=m && MTD))
endchoice
config ROMFS_ON_BLOCK
bool
default y if ROMFS_BACKED_BY_BLOCK || ROMFS_BACKED_BY_BOTH
config ROMFS_ON_MTD
bool
default y if ROMFS_BACKED_BY_MTD || ROMFS_BACKED_BY_BOTH