linux-kernel - RE: [PATCH] ARM: boot/compressed/misc.s: Include <linux/bug.h> to fix build break

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Date:	Mon, 27 Feb 2012 12:14:01 -0800
From:	Stephen Warren <swarren@...dia.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ARM: boot/compressed/misc.s: Include <linux/bug.h> to
	fix build break

Russell King wrote at Monday, February 27, 2012 12:57 PM:
> On Mon, Feb 27, 2012 at 12:52:30PM -0700, Stephen Warren wrote:
> > Commmit cf86c17 "kernel.h: doesn't explicitly use bug.h, so don't include
> > it." caused the following build failure on ARM:
> >
> >   CC      arch/arm/boot/compressed/misc.o
> > In file included from arch/arm/boot/compressed/misc.c:28:0:
> > arch/arm/mach-tegra/include/mach/uncompress.h: In function 'arch_decomp_setup':
> > arch/arm/mach-tegra/include/mach/uncompress.h:125:2: error: implicit declaration of function
> 'BUILD_BUG_ON_ZERO' [-Werror=implicit-function-declaration]
> > cc1: some warnings being treated as errors
> 
> Err no.  The decompressor is _not_ part of the kernel, it's a separate
> stand alone environment.  Including randomly kernel headers from the
> rest of the kernel is bad news, particularly if they start calling out
> to external code.
> 
> You should try to keep your uncompress.h as free of other dependencies
> as possible.

OK, It looks like all we need from <linux/kernel.h> is BIT() and
ARRAY_SIZE(). The latter requires <linux/bug.h>. Should I just redefine
those macros in our uncompress.h?

-- 
nvpublic

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