> In trying to compile an IDEA encryption routine for the kernel, I'm
> getting the following error:
[...]
> drivers/block/block.a(idea.o): In function `idea_encrypt_block':
> idea.o(.text+0x466): undefined reference to `memcpy'
> idea.o(.text+0x4a8): undefined reference to `memcpy'
> make: *** [vmlinux] Error 1
You forgot to include <linux/string.h> in idea.c.
Ralf