linux-kernel - Re: [PATCH 1/3] x86, cacheinfo: Fix disabling of L3 cache indexes

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Date:	Wed, 20 Jan 2010 15:04:46 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...64.org>
CC:	mingo@...e.hu, tglx@...utronix.de, andreas.herrmann3@....com,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] x86, cacheinfo: Fix disabling of L3 cache indexes

On 01/19/2010 03:07 AM, Borislav Petkov wrote:
>  
> +static void __wbinvd(void *dummy)
> +{
> +	asm volatile("wbinvd" : : : "memory");
> +}
> +

[...]

> +	smp_call_function_single(cpu, __wbinvd, NULL, 1);

I really don't like this combination.

First of all, it's an asm version of an instruction we already have
macros for.  This should probably just be wbinvd(), or *possibly*
native_wbinvd(), although that would have to be justified -- especially
since the preexisting code used wbinvd().

Second, it's pretty obvious that the only reason for this function at
all is to provide a wrapper that can be passed to smp_call_function*().
 It would be a lot cleaner to have a small function wbinvd_on_cpu(cpu)
as a wrapper for the higher-order functionality.

	-hpa
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