With CONFIG_CRASH_DUMP_MEMDEV=y in the kernel config this results in
the dump_overlay compile error, with that disabled everything compiles
fine.

If your kernel .config looks like this, it will compile fine:

CONFIG_CRASH_DUMP=m
CONFIG_KERNTYPES=y
CONFIG_CRASH_DUMP_BLOCKDEV=m
CONFIG_CRASH_DUMP_NETDEV=m
# CONFIG_CRASH_DUMP_MEMDEV is not set
CONFIG_CRASH_DUMP_COMPRESS_RLE=m
CONFIG_CRASH_DUMP_COMPRESS_GZIP=m

The upstream is looking into the MEMDEV problem, but suffice to say
that you don't need it to do kernel crash dumps to a disk device (such
as swap) or to a network device.

Micah


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