Re: [PATCH] x86-64, rwsem: Avoid store forwarding hazzard in __downgrade_write

[H. Peter Anvin]

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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