linux-kernel - Re: [RFC/PATCH 00/14] split exception table content out of module.h into extable.h

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Date:	Sun, 24 Jul 2016 21:18:19 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Chris Metcalf <cmetcalf@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Helge Deller <deller@....de>, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Matt Turner <mattst88@...il.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Paul Mackerras <paulus@...ba.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Richard Henderson <rth@...ddle.net>,
	Russell King <linux@...linux.org.uk>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Will Deacon <will.deacon@....com>, linux-alpha@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Linux/m68k" <linux-m68k@...r.kernel.org>,
	linux-mips <linux-mips@...ux-mips.org>,
	Parisc List <linux-parisc@...r.kernel.org>,
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	sparclinux@...r.kernel.org
Subject: Re: [RFC/PATCH 00/14] split exception table content out of module.h
 into extable.h

On Sun, Jul 24, 2016 at 8:42 PM, Paul Gortmaker
<paul.gortmaker@...driver.com> wrote:
>
> While doing an audit looking for unnecessary instances of module.h
> inclusion across arch/x86/ I found a significant number of includes
> of module.h were for things like search_exception_table and friends.
>
> For historical reasons (i.e. pre-git) the exception table stuff was
> buried in the middle of the module.h file.  So we have core kernel
> files that are completely non-modular (both arch specific and arch
> independent) that are just including module.h for this.
>
> The converse is also true, in that conventional drivers, be they for
> filesystems or actual hardware peripherals or similar, do not
> normally care about the exception tables.
>
> Here we fork the exception table content [...]

This looks to be the right thing to do as far as I can tell. I'm not
sure how big of a problem the extable stuff is (we definitely have
much bigger unnecessary include files that cause a lot more problems),
but it seems like a reasonable cleanup.

              Linus