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

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Message-ID: <m2vdo6l2g2.fsf@igel.home>
Date:	Tue, 12 May 2009 18:18:37 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	"Jan Beulich" <JBeulich@...ell.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Nick Piggin" <npiggin@...e.de>, <hpa@...or.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: uses of cmpxchg/xadd in spinlock.h and rwsem.h vs. CONFIG_M386

"Jan Beulich" <JBeulich@...ell.com> writes:

> 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?

This came up before, see
<http://marc.info/?l=linux-kernel&m=123141659309208&w=2>.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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