linux-kernel - Re: [PATCH] blk-throttle: don't call xchg on bool

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Date:	Wed, 30 Mar 2011 12:53:42 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Andreas Schwab <schwab@...ux-m68k.org>
Cc:	linux-kernel@...r.kernel.org, jaxboe@...ionio.com,
	paulmck@...ux.vnet.ibm.com, oleg@...hat.com
Subject: Re: [PATCH] blk-throttle: don't call xchg on bool

On Wed, Mar 30, 2011 at 03:51:34PM +0200, Andreas Schwab wrote:
> Vivek Goyal <vgoyal@...hat.com> writes:
> 
> > Which arch creates the problem and what's the issue here if data type
> > is smaller than 32bit?
> 
> Just look at the various implementations in arch/*/include/asm/system.h:
> 
> - arm: supports only one and 4 byte xchg
> - avr32: supports only 4 byte xchg
> - frv: supports only 4 byte xchg
> - m32r: SMP supports only 4 byte xchg
> - microblaze: supports only one and 4 byte xchg
> 
> etc.
> 
> > Is it a compile time warning?
> 
> Most implementations turn the use of xchg with a bad pointer into a link
> error.

Thanks Andreas. I get it. I did check arm and it is supporting only one
and 4 byte xchg.

Vivek
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