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

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Message-ID: <1292808518.10593.8.camel@sli10-conroe>
Date:	Mon, 20 Dec 2010 09:28:38 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.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 Thu, 2010-12-16 at 17:50 +0800, Tejun Heo wrote:
> Hello, Shaohua.
> 
> On 12/16/2010 06:56 AM, Shaohua Li wrote:
> >>>>> -#include <asm-generic/vmlinux.lds.h>
> >>>>>  #include <asm/asm-offsets.h>
> >>>>>  #include <asm/thread_info.h>
> >>>>>  #include <asm/page_types.h>
> >>>>>  #include <asm/cache.h>
> >>>>> +#include <asm-generic/vmlinux.lds.h>
> >>>>>  #include <asm/boot.h>
> >>>>
> >>>> Why do we need this chunk?
> >>> the cache size is defined in cache.h, so I need move vmlinux.lds.h after
> >>> cache.h
> >>
> >> The right fix is to move the inclusion of cache.h to
> >> asm-generic/vmlinux.lds.h.  A quick audit only found sparc that
> >> failed to guard non assembler stuff.
> >
> > with this, we need check every arch, at least doing a compile. I'm
> > afraid I can't, sorry.
> 
> Not being able to cross build every arch is okay but you at least need
> to make an effort to make things easily applicable to other archs and
> avoid adding subtle ugliness like the above.  Please at least try to
> look at other arch codes and see how things can be made to work across
> different archs.  Setting up cross compilers for the major archs, for
> example, sparc, power and ia64 isn't that difficult either.
This still needs I fix every arch, for example, as Sam pointed out,
spark build will fail. I really have the bandwidth and capability to do
this. Increment changes are always preferred. My original patch is
trying to follow increment changes way.

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