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From: David Miller <davem@davemloft.net>
Subject: Re: linux-next: origin tree build failure
Date: Tue, 14 Apr 2009 01:57:27 -0700 (PDT)
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From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Tue, 14 Apr 2009 14:43:17 +1000

> Dave, arch/sparc/include/asm/atomic_32.h should really include
> asm/system.h since xchg is used in there.

That's true.

But atomic.h is not the proper place to obtain xchg() from, which is
asm/system.h, and that's what debug_locks.h needs to include if it
needs to use xchg().

This is why the s390 build broke in precisely the same way.