linux-kernel - RE: [PATCH 1/2] kbuild: Add "Section mismatch" warning whitelist for powerpc

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Message-ID: <989B956029373F45A0B8AF0297081890B76040@zch01exm26.fsl.freescale.net>
Date:	Tue, 15 May 2007 17:22:56 +0800
From:	"Li Yang-r58472" <LeoLi@...escale.com>
To:	"Satyam Sharma" <satyam.sharma@...il.com>,
	"Kumar Gala" <galak@...nel.crashing.org>
Cc:	"Sam Ravnborg" <sam@...nborg.org>,
	"Linus" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...l.org>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...abs.org>
Subject: RE: [PATCH 1/2] kbuild: Add "Section mismatch" warning whitelist for powerpc

> -----Original Message-----
> From: Satyam Sharma [mailto:satyam.sharma@...il.com]
> Sent: Tuesday, May 15, 2007 8:18 AM
> To: Kumar Gala
> Cc: Sam Ravnborg; Li Yang-r58472; Linus; Andrew Morton; Linux Kernel;
> linuxppc-dev@...abs.org
> Subject: Re: [PATCH 1/2] kbuild: Add "Section mismatch" warning
whitelist for
> powerpc
> 
> Hi,
> 
> On 5/14/07, Kumar Gala <galak@...nel.crashing.org> wrote:
> >
> > On May 14, 2007, at 6:06 AM, Sam Ravnborg wrote:
> >
> > > On Mon, May 14, 2007 at 06:53:32PM +0800, Li Yang wrote:
> > >> This patch fixes the following "Section mismatch" warnings when
> > >> build powerpc platforms.
> > >>
> > >> -------------
> > >> WARNING: arch/powerpc/mm/built-in.o - Section mismatch: reference
to
> > >> .init.text:early_get_page from .text between
> > >> 'pte_alloc_one_kernel' (at
> > >> offset 0xc68) and 'pte_alloc_one'
> > >> WARNING: mm/built-in.o - Section mismatch: reference to
> > >> .init.text:set_up_list3s from .text between
> > >> 'kmem_cache_create' (at offset
> > >> 0x20300) and 'cache_reap'
> > >> -------------
> >
> > This warnings should be handled by __init_refok instead.
> 
> Actually, once __init_refok comes in, would we need any other
> whitelisting mechanism at all? I think the exception patterns in
> secref_whitelist() and those two other whitelisting functions
> (init_section_ref_ok and exit_section_ref_ok) could all be
> subsumed and made redundant if / when __init_refok is used
> in the actual sources.

I don't think so.  __init_refok can be used to mark special functions
which are legitimate to reference .init.text/.init.data but cannot be
used to mark special sections.

- Leo
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