linux-kernel - Re: [PATCH v3 0/2] Consolidate redundant register/stack access code

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Date:	Wed, 17 Feb 2016 10:45:10 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	David Long <dave.long@...aro.org>
Cc:	Michael Ellerman <mpe@...erman.id.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"chengang@...ndsoft.com.cn" <chengang@...ndsoft.com.cn>,
	Andy Lutomirski <luto@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Borislav Petkov <bp@...e.de>, Brian Gerst <brgerst@...il.com>,
	David Hildenbrand <dahi@...ux.vnet.ibm.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>,
	Jan Beulich <JBeulich@...e.com>,
	Kees Cook <keescook@...omium.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Rashmica Gupta <rashmicy@...il.com>,
	Rich Felker <dalias@...c.org>,
	Richard Kuo <rkuo@...eaurora.org>,
	Roland McGrath <roland@...k.frob.com>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Will Deacon <will.deacon@....com>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	linux-arm-kernel@...ts.infradead.org,
	linux-hexagon@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, x86@...nel.org
Subject: Re: [PATCH v3 0/2] Consolidate redundant register/stack access code


* David Long <dave.long@...aro.org> wrote:

> On 02/09/2016 04:45 AM, Ingo Molnar wrote:
> >
> >* Michael Ellerman <mpe@...erman.id.au> wrote:
> >
> >>On Tue, 2016-02-09 at 00:38 -0500, David Long wrote:
> >>
> >>>From: "David A. Long" <dave.long@...aro.org>
> >>>
> >>>Move duplicate and functionally equivalent code for accessing registers
> >>>and stack (CONFIG_HAVE_REGS_AND_STACK_ACCESS_API) from arch subdirs into
> >>>common kernel files.
> >>>
> >>>I'm sending this out again (with updated distribution list) because v2
> >>>just never got pulled in, even though I don't think there were any
> >>>outstanding issues.
> >>
> >>A big cross arch patch like this would often get taken by Andrew Morton, but
> >>AFAICS you didn't CC him - so I just added him, perhaps he'll pick it up for
> >>us :D
> >
> >The other problem is that the second patch is commingling changes to 6 separate
> >architectures:
> >
> >  16 files changed, 106 insertions(+), 343 deletions(-)
> >
> >that should probably be 6 separate patches. Easier to review, easier to bisect to,
> >easier to revert, etc.
> >
> >Thanks,
> >
> >	Ingo
> >
> 
> I see your point but I'm not sure it could have been broken into separate 
> successive patches that would each build for all architectures.

Why? AFAICS all the functionality appears to be conditional on 
CONFIG_HAVE_REGS_AND_STACK_ACCESS_API, so it ought to build standalone as well, on 
a per arch basis, as long as the core kernel patch is applied first.

Thanks,

	Ingo