linux-kernel - Re: [GIT PULL] KVM changes for 3.12

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Message-ID: <20130904101826.GA2744@ulmo>
Date:	Wed, 4 Sep 2013 12:18:28 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, pbonzini@...hat.com
Subject: Re: [GIT PULL] KVM changes for 3.12

On Tue, Sep 03, 2013 at 03:10:46PM +0300, Gleb Natapov wrote:
[...]
> Aneesh Kumar K.V (5):
>       mm/cma: Move dma contiguous changes into a seperate config

Hi Gleb,

This commit is going to cause runtime regressions on various ARM
platforms because it renames a symbol but fails to update all default
configurations that select the symbol. A quick grep shows that three ARM
platforms are affected:

	$ git grep CONFIG_CMA=y
	arch/arm/configs/keystone_defconfig:CONFIG_CMA=y
	arch/arm/configs/omap2plus_defconfig:CONFIG_CMA=y
	arch/arm/configs/tegra_defconfig:CONFIG_CMA=y

I've been digging around a bit and it seems like the original patch from
Aneesh had the defconfig changes but they were dropped because they "...
require separate handling to avoid pointless merge conflicts."[0]

While I can't speak for Keystone or OMAP, at least on Tegra this causes
issues because we use CMA for framebuffer allocation. Since we only have
CMA selected but not the new DMA_CMA, large DMA allocations will fail.

Can we have the defconfig changes added back to this patch, please? I
suspect that Linus can handle any resulting merge conflicts.

Thierry

[0]: http://permalink.gmane.org/gmane.linux.kernel.mm/102707

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