linux-kernel - Re: [RESEND][PATCH 1/2] lib/scatterlist: Make ARCH_HAS_SG

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Date:	Sat, 22 Mar 2014 23:03:49 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
cc:	Laura Abbott <lauraa@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Fenghua Yu <fenghua.yu@...el.com>,
	Tony Luck <tony.luck@...el.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ia64@...r.kernel.org,
	linux390@...ibm.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RESEND][PATCH 1/2] lib/scatterlist: Make ARCH_HAS_SG_CHAIN an
 actual Kconfig

On Sat, 22 Mar 2014, James Bottomley wrote:

> On Sat, 2014-03-22 at 11:13 -0700, Laura Abbott wrote:
> > Rather than have architectures #define ARCH_HAS_SG_CHAIN in an architecture
> > specific scatterlist.h, make it a proper Kconfig option and use that
> > instead. At same time, remove the header files are are now mostly
> > useless and just include asm-generic/scatterlist.h.
> 
> Well, the transformation looks fine.  Perhaps part of the reason for the
> lack of response is that there's no compelling reason in the change log
> above for doing this.  The usual reason for eliminating ARCH_HAS is that
> it's hiding something that would be better expressed a different way
> (that's actually intuitive to grep) or that it's expressing something
> that should be configurable.  Neither of these reasons apply in this
> case, because SG_CHAIN definitely is a property of the architecture not
> the config space and it's not really hiding anything.

Getting rid of pointless copied code is definitely a good enough
reason and the patch removes quite some of that.
 
Thanks,

	tglx
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