linux-kernel - Re: Section mismatches in drivers/video/console/promcon

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Date:	Sat, 02 Jun 2007 21:24:43 +0800
From:	"Antonino A. Daplas" <adaplas@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	jakub@...hat.com, Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	daplas@...il.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Section mismatches in drivers/video/console/promcon

On Sat, 2007-06-02 at 14:42 +0200, Sam Ravnborg wrote:
> Building a kernel for sparc64 defconfig gave me following warnings:
> WARNING: drivers/built-in.o(.text+0xb788): Section mismatch: reference to .init.data:promfont_unitable (between 'promcon_init_unimap' and 'promcon_init')
> WARNING: drivers/built-in.o(.text+0xb790): Section mismatch: reference to .init.data:promfont_unitable (between 'promcon_init_unimap' and 'promcon_init')
> WARNING: drivers/built-in.o(.text+0xb794): Section mismatch: reference to .init.data:promfont_unicount (between 'promcon_init_unimap' and 'promcon_init')
> WARNING: drivers/built-in.o(.text+0xb798): Section mismatch: reference to .init.data:promfont_unicount (between 'promcon_init_unimap' and 'promcon_init')
> 
> The warnings happens because the function: promcon_init_unimap()
> references promfont_unitable and promfont_unicount which are marked
> __initdata by the conmakehash command in the drivers/video/console/Makefile
> 
> The function promcon_init_unimap() are referenced in two places:
> 1) In prom_con_init() which is marked __init => no problem.
> 2) In promcon_init() which is not marked __init => warning.
> The actual code is here:
> 	if (!promcon_uni_pagedir[0] && p) {
> 		promcon_init_unimap(conp);
> 	}
> 

>  could not from the code judge if promcon_init_unimap is really
> only used during early init or this is a bug.

promcon_init() can be called again from visual_init() during
vc_allocate().  So anything referenced by promcon_init() should not be
marked __init.

Although, if you want to keep promfont_unitable and promfont_unicount
__init, you can probably use con_copy_unimap() using the default vc as
the source instead of doing a promcon_init_unimap() again.

Tony


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