linux-kernel - Re: [patch 2/3] add new macros to make percpu readmostly section correctly align

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Message-ID: <1292200886.2323.15.camel@sli10-conroe>
Date:	Mon, 13 Dec 2010 08:41:26 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"sam@...nborg.org" <sam@...nborg.org>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>
Subject: Re: [patch 2/3] add new macros to make percpu readmostly section
 correctly align

On Fri, 2010-12-10 at 23:14 +0800, Tejun Heo wrote:
> Hello,
> 
> On 12/02/2010 03:02 AM, Shaohua Li wrote:
> > percpu readmostly section should start and end at address cachline aligned.
> > Idealy we should change PERCPU_VADDR/PERCPU, but I can't change all arch code, so
> > I add new macros for x86.
> > 
> > Signed-off-by: Shaohua Li <shaohua.li@...el.com>
> 
> Why add another set of macros?  Can't you just make the default one
> aligned?
how to do it without changing all arch code? There isn't cache line size
macro for all arch which could be used in vmlinux.lds.h, IIRC.

Thanks,
Shaohua

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