linux-kernel - Re: [PATCH] x86-64, rwsem: Avoid store forwarding hazzard in __downgrade

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Date:	Sat, 13 Feb 2010 00:16:58 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Avi Kivity <avi@...hat.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86-64, rwsem: Avoid store forwarding hazzard in __downgrade_write

On 02/12/2010 11:13 PM, Avi Kivity wrote:
> +#ifndef CONFIG_X86_64
> +		       "i" (-RWSEM_WAITING_BIAS)
> +#else
> +		       "r" (-RWSEM_WAITING_BIAS)
>  #endif
> +		     : "memory", "cc");

Using an "er" constraint here should work on both architectures.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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