linux-kernel - Re: [RFC PATCH] arm: asm/cmpxchg.h: Add support half-word xchg()

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Message-ID: <20150225173827.GH8656@n2100.arm.linux.org.uk>
Date:	Wed, 25 Feb 2015 17:38:27 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] arm: asm/cmpxchg.h: Add support half-word xchg()

On Wed, Feb 25, 2015 at 12:34:35PM -0500, Pranith Kumar wrote:
> On Wed, Feb 25, 2015 at 12:14 PM, Russell King - ARM Linux
> <linux@....linux.org.uk> wrote:
> > Actually, I think we ought to get rid of __bad_xchg() so that cases
> > like this cause a link error instead of a runtime error, just like we
> > do in other cases as well.
> >
> > That's something that goes back ages (it used to be called something
> > like invalidptr in 2.0 kernels...)
> 
> That sounds like a good idea. I will cook up a patch doing this.

I've just removed it on my build system's tree, and we'll see tomorrow
morning how it fairs.  If it spits out a lot of errors, we won't be
able to remove it.

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