linux-kernel - Re: [PATCH v4 0/6] generic early

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Message-ID: <20140225183012.GA27164@mudshark.cambridge.arm.com>
Date:	Tue, 25 Feb 2014 18:30:12 +0000
From:	Will Deacon <will.deacon@....com>
To:	Mark Salter <msalter@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Dave Young <dyoung@...hat.com>,
	Rob Herring <robherring2@...il.com>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	"patches@...aro.org" <patches@...aro.org>
Subject: Re: [PATCH v4 0/6] generic early_ioremap support

On Tue, Feb 25, 2014 at 02:10:04PM +0000, Mark Salter wrote:
> On Wed, 2014-02-12 at 15:56 -0500, Mark Salter wrote:
> > This patch series takes the common bits from the x86 early ioremap
> > implementation and creates a generic implementation which may be used
> > by other architectures. The early ioremap interfaces are intended for
> > situations where boot code needs to make temporary virtual mappings
> > before the normal ioremap interfaces are available. Typically, this
> > means before paging_init() has run.
> > 
> > These patches are layered on top of generic fixmap patches which
> > were pulled into 3.14-rc with the exception of the arm patch:
> > 
> >   https://lkml.org/lkml/2013/11/25/477
> > 
> > The arm fixmap patch is currently in the akpm tree and has been
> > part of linux-next for a while.
> > 
> > This is version 4 of the patch series. These patches (and underlying
> > fixmap patches) may be found at:
> > 
> >   git://github.com/mosalter/linux.git (early-ioremap-v4 branch)
> 
> There have been no comments on this patch series over the past
> two weeks. I'd like to get it into linux-next for some wider
> testing and eventually into 3.15. Is there something I can do
> to help it along?

I'd suggest spitting the core part out from the arch-specific parts. That
way, the core part can merged independently and architectures can move over
as they see fit. It also signals (at least to me) that, "hey, I should
probably review this" whilst my current stance is "there's a whole load of
stuff under mm/ that needs to be acked first".

If you put the whole thing into next, you just run the risk of conflicts
with all the arch trees.

Will
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