From: Randy Dunlap <randy.dunlap@xxxxxxxxxx> libcrc32c uses CRYPTO interfaces so it should depend on CRYPTO. crypto/built-in.o: In function `crc32c_mod_init': crc32c.c:(.init.text+0xc): undefined reference to `crypto_register_shash' crypto/built-in.o: In function `crc32c_mod_fini': crc32c.c:(.exit.text+0xc): undefined reference to `crypto_unregister_shash' lib/built-in.o: In function `crc32c': (.text+0xfcf9): undefined reference to `crypto_shash_update' lib/built-in.o: In function `libcrc32c_mod_init': libcrc32c.c:(.init.text+0x666): undefined reference to `crypto_alloc_shash' lib/built-in.o: In function `libcrc32c_mod_fini': libcrc32c.c:(.exit.text+0xc): undefined reference to `crypto_free_tfm' Signed-off-by: Randy Dunlap <randy.dunlap@xxxxxxxxxx> --- lib/Kconfig | 1 + 1 file changed, 1 insertion(+) --- linux-next-20081112.orig/lib/Kconfig +++ linux-next-20081112/lib/Kconfig @@ -64,6 +64,7 @@ config CRC7 config LIBCRC32C tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" + depends on CRYPTO select CRYPTO_CRC32C help This option is provided for the case where no in-kernel-tree
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