block: add BIG FAT WARNING to CONFIG_DEBUG_BLOCK_EXT_DEVT
CONFIG_DEBUG_BLOCK_EXT_DEVT can break booting even on some modern distros. Add BIG FAT WARNING to keep people at a safe distance. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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@ -652,6 +652,11 @@ config DEBUG_BLOCK_EXT_DEVT
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depends on BLOCK
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default n
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help
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BIG FAT WARNING: ENABLING THIS OPTION MIGHT BREAK BOOTING ON
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SOME DISTRIBUTIONS. DO NOT ENABLE THIS UNLESS YOU KNOW WHAT
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YOU ARE DOING. Distros, please enable this and fix whatever
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is broken.
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Conventionally, block device numbers are allocated from
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predetermined contiguous area. However, extended block area
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may introduce non-contiguous block device numbers. This
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