linux-kernel - Re: [PATCH] [5/7] Readd rdmsrl

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Message-ID: <alpine.LFD.1.00.0803211756000.3781@apollo.tec.linutronix.de>
Date:	Fri, 21 Mar 2008 18:06:13 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <andi@...stfloor.org>
cc:	andreas.herrmann3@....com, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [5/7] Readd rdmsrl_safe

On Wed, 12 Mar 2008, Andi Kleen wrote:
> RDMSR for 64bit values with exception handling.
> 
> Makes it easier to deal with 64bit valued MSRs. The old 64bit code
> base had that too as checking_rdmsrl(), but it got dropped somehow. 

Yup, no users.

> +#define rdmsrl_safe(msr,p) \
> +	({ int __err; *(p) = native_read_msr_safe(msr, &__err); __err; })
> +

static inline please

>  #define rdtscl(low)						\
>  	((low) = (u32)native_read_tsc())
>  
> Index: linux/include/asm-x86/paravirt.h
> ===================================================================
> --- linux.orig/include/asm-x86/paravirt.h
> +++ linux/include/asm-x86/paravirt.h
> @@ -687,6 +687,10 @@ static inline int paravirt_write_msr(uns
>  	(*b) = _l >> 32;			\
>  	_err; })
>  
> +#define rdmsrl_safe(msr, p) ({			\
> +	int _err;				\
> +	*(p) = paravirt_read_msr(msr, &_err);	\
> +	_err; })

ditto

Thanks,

	tglx
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