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

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Message-ID: <20071026155648.GB4321@flint.arm.linux.org.uk>
Date:	Fri, 26 Oct 2007 16:56:48 +0100
From:	Russell King <rmk@....linux.org.uk>
To:	linux-ide@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Jeff Garzik <jgarzik@...ox.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Regression: commit "ide: constify struct ide_port_info" causes breakage

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:

static struct hpt_info hpt36x __devinitdata = {
static struct hpt_info hpt370 __devinitdata = {
static struct hpt_info hpt370a __devinitdata = {
...
static const struct ide_port_info hpt366_chipsets[] __devinitdata = {

If we want ide_port_info to be read-only initdata, then we need
__devroinitdata and __roinitdata tags.

Note: it doesn't show up in cmd64x.c because that file contains no other
data marked as initdata or devinitdata.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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