Greg Ungerer [off-list ref] wrote:

This breaks compilation for m68k targets with:

  CC      net/ipv4/ip_input.o
In file included from
/home/gerg/new-wave.320/linux-3.x/arch/m68k/include/asm/system.h:3:0,
                 from net/ipv4/ip_input.c:116:
/home/gerg/new-wave.320/linux-3.x/arch/m68k/include/asm/cmpxchg.h: In function
‘__xchg’:
/home/gerg/new-wave.320/linux-3.x/arch/m68k/include/asm/cmpxchg.h:33:3: error:
implicit declaration of function ‘BUG’

The old system.h included linux/kernel.h which includes asm/bug.h.
Just including asm/bug.h here in cmpxchg.h is not enough to fix it.
If you include linux/kernel.h though it compiles cleanly.

Which targets, btw?

David