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

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Message-ID: <20101216054620.GA3241@merkur.ravnborg.org>
Date:	Thu, 16 Dec 2010 06:46:20 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	Tejun Heo <htejun@...il.com>, 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, Dec 16, 2010 at 08:53:37AM +0800, Shaohua Li wrote:
> On Wed, 2010-12-15 at 22:08 +0800, Tejun Heo wrote:
> > Hello,
> > 
> > On 12/15/2010 02:57 AM, Shaohua Li wrote:
> > > How about this one?
> > 
> > Much better.  :-)
> > 
> > > +#ifdef INTERNODE_CACHE_BYTES
> > > +#define INTERNODE_CACHEALIGNED						\
> > > +	. = ALIGN(INTERNODE_CACHE_BYTES);
> > > +#else
> > > +#define INTERNODE_CACHEALIGNED
> > > +#endif
> > 
> > Yeah, this looks good.
> > 
> > > Index: linux/arch/x86/kernel/vmlinux.lds.S
> > > ===================================================================
> > > --- linux.orig/arch/x86/kernel/vmlinux.lds.S	2010-12-15 09:37:01.000000000 +0800
> > > +++ linux/arch/x86/kernel/vmlinux.lds.S	2010-12-15 09:37:06.000000000 +0800
> > > @@ -20,11 +20,11 @@
> > >  #define LOAD_OFFSET __START_KERNEL_map
> > >  #endif
> > >  
> > > -#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.

	Sam
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