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NOMMU: Fix the RomFS Kconfig to ensure at least one backing store is selected
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>
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@ -1,6 +1,6 @@
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config ROMFS_FS
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tristate "ROM file system support"
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depends on BLOCK
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depends on BLOCK || MTD
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---help---
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This is a very small read-only file system mainly intended for
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initial ram disks of installation disks, but it could be used for
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@ -15,9 +15,19 @@ config ROMFS_FS
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If you don't know whether you need it, then you don't need it:
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answer N.
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config ROMFS_ON_BLOCK
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bool "Block device-backed ROM file system support" if (ROMFS_ON_MTD && EMBEDDED)
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depends on ROMFS_FS && BLOCK
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#
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# Select the backing stores to be supported
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#
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choice
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prompt "RomFS backing stores"
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depends on ROMFS_FS
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default ROMFS_BACKED_BY_BLOCK
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help
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Select the backing stores to be supported.
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config ROMFS_BACKED_BY_BLOCK
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bool "Block device-backed ROM file system support"
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depends on BLOCK
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help
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This permits ROMFS to use block devices buffered through the page
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cache as the medium from which to retrieve data. It does not allow
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@ -25,9 +35,8 @@ config ROMFS_ON_BLOCK
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If unsure, answer Y.
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config ROMFS_ON_MTD
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config ROMFS_BACKED_BY_MTD
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bool "MTD-backed ROM file system support"
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depends on ROMFS_FS
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depends on MTD=y || (ROMFS_FS=m && MTD)
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help
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This permits ROMFS to use MTD based devices directly, without the
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@ -38,3 +47,16 @@ config ROMFS_ON_MTD
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If unsure, answer Y.
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config ROMFS_BACKED_BY_BOTH
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bool "Both the above"
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depends on BLOCK && (MTD=y || (ROMFS_FS=m && MTD))
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endchoice
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config ROMFS_ON_BLOCK
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bool
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default y if ROMFS_BACKED_BY_BLOCK || ROMFS_BACKED_BY_BOTH
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config ROMFS_ON_MTD
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bool
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default y if ROMFS_BACKED_BY_MTD || ROMFS_BACKED_BY_BOTH
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