linux-kernel - Re: Regression: commit "ide: constify struct ide_port

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Message-ID: <alpine.LFD.0.999.0710260909390.30120@woody.linux-foundation.org>
Date:	Fri, 26 Oct 2007 09:12:21 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Russell King <rmk@....linux.org.uk>
cc:	linux-ide@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Jeff Garzik <jgarzik@...ox.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Regression: commit "ide: constify struct ide_port_info" causes
 breakage



On Fri, 26 Oct 2007, Russell King wrote:
>
> commit 8562043606430185cad26d085d46adcc7ad67fd1 is broken, causing:
> 
>   CC      drivers/ide/pci/cmd64x.o
>   CC      drivers/ide/pci/hpt366.o
> drivers/ide/pci/hpt366.c:1428: error: hpt366_chipsets causes a section type conflict
> 
> and therefore should be reverted.
> 
> The problem arises because hpt366 has other data marked with __devinitdata,
> so the compiler tries to define the initdata section with read-write
> attributes at one point, and read-only attributes when encountering the
> const-but-devinitdata declaration:

Sad. This is not too uncommon, but yeah, it's really sad that we cannot 
use "const" (as a compiler type safety marker) together with section 
definitions (to get it put in special init sections).

Bartlomiej - I don't think we need to revert the whole commit, but all 
those "static const xyz __devinitdata = { .." things probably do need to 
have the const removed, even if it would be otherwise correct ;(

		Linus
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