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

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Message-ID: <1292288924.2323.458.camel@sli10-conroe>
Date:	Tue, 14 Dec 2010 09:08:44 +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 Mon, 2010-12-13 at 17:47 +0800, Tejun Heo wrote:
> Hello,
> 
> On 12/13/2010 01:41 AM, Shaohua Li wrote:
> >> 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.
> 
> Can't we get around that with some ifdefferies?  And even if we'll
> have to change lds on every arch, I think we better do it that way.
I don't understand what you mean. defining a cachine line size macro for
all archs? There is such macro, but using it in vmlinux.ld.h always
report error. There is some other defines which can't be included in a
link script.
> It's not like the problem exists only on x86, right?
yes, though currently only x86 has it.

Thanks,
Shaohua

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