From: Stephen Rothwell <redacted>
Date: Fri, 29 May 2015 19:18:47 +1000

Nothing in asm/io.h uses anything from vmalloc.h, so remove the include
and fix up the build problems in an allmodconfig (64 bit and 32 bit)
build.

This may be the place where x86 builds get vmalloc.h implicitly included
and that tends to hide places where vmalloc() et al are added to files
but the include of vmalloc.h is forgotten.

 ...

Suggested-by: David Miller <davem@davemloft.net>
Signed-off-by: Stephen Rothwell <redacted>

With the follow-on allnoconfig fixes:

Acked-by: David S. Miller <davem@davemloft.net>

Thanks a lot for doing this!