linux-kernel - Re: [PATCH v3 4/7] x86/tlb: add tlb flush all factor for specific CPUs

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Date:	Wed, 09 May 2012 10:10:35 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	mgorman@...e.de, npiggin@...il.com, tglx@...utronix.de,
	mingo@...hat.com, arnd@...db.de, rostedt@...dmis.org,
	fweisbec@...il.com, jeremy@...p.org, gregkh@...uxfoundation.org,
	glommer@...hat.com, riel@...hat.com, luto@....edu, avi@...hat.com,
	len.brown@...el.com, dhowells@...hat.com, fenghua.yu@...el.com,
	borislav.petkov@....com, yinghai@...nel.org, ak@...ux.intel.com,
	cpw@....com, steiner@....com, akpm@...ux-foundation.org,
	penberg@...nel.org, hughd@...gle.com, rientjes@...gle.com,
	kosaki.motohiro@...fujitsu.com, n-horiguchi@...jp.nec.com,
	paul.gortmaker@...driver.com, trenn@...e.de, tj@...nel.org,
	oleg@...hat.com, axboe@...nel.dk, a.p.zijlstra@...llo.nl,
	kamezawa.hiroyu@...fujitsu.com, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/7] x86/tlb: add tlb flush all factor for specific
 CPUs

>

> This uses x86_model without qualifying it x86 (family), however that is
> meaningless.  All the CPUs you are dealing with above have c->x86 == 6,
> but you need to handle others correctly (even if that just means
> defaulting it to zero.)
> 
> One way to do that is to do:
> 
> switch ((c->x86 << 8) + c->x86_model) {
> 
> ... and use numbers like 0x62d instead of 45.


Yes, this is better, thanks!

> 
> 	-hpa
> 
> 


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