linux-kernel - uses of cmpxchg/xadd in spinlock.h and rwsem.h vs. CONFIG

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Date:	Tue, 12 May 2009 16:19:00 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Nick Piggin" <npiggin@...e.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: uses of cmpxchg/xadd in spinlock.h and rwsem.h vs. CONFIG_M386

While looking at a completely different issue I happened to grep for uses of
xadd, and it would appear to me that there got uses added that would make
a M386-configured SMP kernel die on an actual i386.

Oh, for the rwsem case I see - it would use the RWSEM_GENERIC_SPINLOCK case
when selecting M386. But I see nothing similar for the ticket spinlocks - am
I overlooking something?

Jan

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