linux-kernel - Re: Build regressions/improvements in v4.2-rc8

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Date:	Wed, 26 Aug 2015 11:03:02 +0200
From:	Alexander Graf <agraf@...e.de>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	kvm-ppc@...r.kernel.org
Subject: Re: Build regressions/improvements in v4.2-rc8



On 24.08.15 10:36, Geert Uytterhoeven wrote:
> On Mon, Aug 24, 2015 at 10:34 AM, Geert Uytterhoeven
> <geert@...ux-m68k.org> wrote:
>> JFYI, when comparing v4.2-rc8[1] to v4.2-rc7[3], the summaries are:
>>   - build errors: +4/-7
> 
> 4 regressions:
>   + /home/kisskb/slave/src/include/linux/kvm_host.h: error: array
> subscript is above array bounds [-Werror=array-bounds]:  => 430:19
>     (arch/powerpc/kvm/book3s_64_mmu.c: In function 'kvmppc_mmu
> _book3s_64_tlbie':)
> 
> powerpc-randconfig (seen before in a v3.15-rc1 build?)

I'm not quite sure what's going wrong here. The code in question does

  kvm_for_each_vcpu(i, v, vcpu->kvm)
    kvmppc_mmu_pte_vflush(v, va >> 12, mask);

and IIUC the thing we're potentially running over on would be
kvm->vcpus[i]. But that one is bound by the kvm_for_each_vcpu loop, no?


Alex
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