linux-kernel - Re: [RFC PATCH 02/33] Add sync bitops

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Message-ID: <20060718103404.GC3748@stusta.de>
Date:	Tue, 18 Jul 2006 12:34:04 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com,
	Jeremy Fitzhardinge <jeremy@...p.org>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...l.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Zachary Amsden <zach@...are.com>,
	Ian Pratt <ian.pratt@...source.com>,
	Christian Limpach <Christian.Limpach@...cam.ac.uk>,
	Christoph Lameter <clameter@....com>
Subject: Re: [RFC PATCH 02/33] Add sync bitops

On Tue, Jul 18, 2006 at 12:00:02AM -0700, Chris Wright wrote:

> Add "always lock'd" implementations of set_bit, clear_bit and
> change_bit and the corresponding test_and_ functions.  Also add
> "always lock'd" implementation of cmpxchg.  These give guaranteed
> strong synchronisation and are required for non-SMP kernels running on
> an SMP hypervisor.
> 
> Signed-off-by: Ian Pratt <ian.pratt@...source.com>
> Signed-off-by: Christian Limpach <Christian.Limpach@...cam.ac.uk>
> Signed-off-by: Chris Wright <chrisw@...s-sol.org>
> Cc: Christoph Lameter <clameter@....com>
> ---
>  include/asm-i386/synch_bitops.h |  166 ++++++++++++++++++++++++++++++++++++++++
>  include/asm-i386/system.h       |   33 +++++++
>  2 files changed, 199 insertions(+)
> 
> diff -r 935903fb1136 include/asm-i386/system.h
> --- a/include/asm-i386/system.h	Mon May 08 19:20:42 2006 -0400
> +++ b/include/asm-i386/system.h	Mon May 08 19:27:04 2006 -0400
> @@ -263,6 +263,9 @@ static inline unsigned long __xchg(unsig
>  #define cmpxchg(ptr,o,n)\
>  	((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
>  					(unsigned long)(n),sizeof(*(ptr))))
> +#define synch_cmpxchg(ptr,o,n)\
> +	((__typeof__(*(ptr)))__synch_cmpxchg((ptr),(unsigned long)(o),\
> +					(unsigned long)(n),sizeof(*(ptr))))
>  #endif
>...

Do I miss anything, or is CONFIG_X86_XEN=y, CONFIG_M386=y an allowed 
configuration that will result in a compile error?

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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