linux-kernel - Re: [PATCH] mm: setup_usemap() must be _

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Date:	Sun, 17 Feb 2008 21:38:55 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Sam Ravnborg <sam@...nborg.org>
cc:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: setup_usemap() must be __meminit

On Sun, 17 Feb 2008, Sam Ravnborg wrote:
> On Sun, Feb 17, 2008 at 01:31:14PM +0100, Geert Uytterhoeven wrote:
> > On Sun, 17 Feb 2008, Geert Uytterhoeven wrote:
> > > On m68k (CONFIG_SPARSEMEM is not set), I get:
> > > 
> > >     WARNING: vmlinux.o(.meminit.text+0x36c): Section mismatch in reference from the function free_area_init_core() to the function .init.text:setup_usemap()
> > >     The function __meminit free_area_init_core() references
> > >     a function __init setup_usemap().
> > >     If free_area_init_core is only used by setup_usemap then
> > >     annotate free_area_init_core with a matching annotation.
> > > 
> > > If CONFIG_SPARSEMEM is set, the problem is  not noticed because setup_usemap()
> > > is always inlined.
> > > 
> > > Properly annotating setup_usemap() and usemap_size() fixes it.
> > 
> > Woops, hit the send button too soon.
> > 
> > setup_usemap() calls alloc_bootmem_node(), causing a whole new
> > avalanche of warnings to be fixed up :-(
> 
> Something you like me to help with?

Yes, that would be nice.

> I would need a config where the mismatch triggers for one
> of the more popular architectures (as in where I have a toolchain).

That was with plain m68k defconfig.

> I could not reproduce it with x86 64bit - not even with -fno-inline-functions

If it helps, my cross-compiler is gcc version 4.1.2 20061115 (prerelease)
(Debian 4.1.1-21).

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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