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

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Message-ID: <20130904103855.GC7402@redhat.com>
Date:	Wed, 4 Sep 2013 13:38:55 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, pbonzini@...hat.com,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Alexander Graf <agraf@...e.de>
Subject: Re: [GIT PULL] KVM changes for 3.12

Copying Marek, Aneesh and Alex since this came through PPC kvm tree.

On Wed, Sep 04, 2013 at 12:18:28PM +0200, Thierry Reding wrote:
> 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]
> 
Marek, that's your words. What do you think about ARM problem?

> 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.
> 
Make config suppose to ask you about new option though, does it?

> 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



--
			Gleb.
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