linux-kernel - Re: [PATCH v2] PC, KVM, CMA: Fix regression caused by wrong get

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Message-ID: <53ECBC6B.5030507@suse.de>
Date:	Thu, 14 Aug 2014 15:40:59 +0200
From:	Alexander Graf <agraf@...e.de>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	linuxppc-dev@...ts.ozlabs.org
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Michael Ellerman <mpe@...erman.id.au>, kvm-ppc@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2] PC, KVM, CMA: Fix regression caused by wrong get_order()
 use


On 14.08.14 07:13, Aneesh Kumar K.V wrote:
> Alexey Kardashevskiy <aik@...abs.ru> writes:
>
>> fc95ca7284bc54953165cba76c3228bd2cdb9591 claims that there is no
>> functional change but this is not true as it calls get_order() (which
>> takes bytes) where it should have called ilog2() and the kernel stops
>> on VM_BUG_ON().
>>
>> This replaces get_order() with order_base_2() (round-up version of ilog2).
>>
>> Suggested-by: Paul Mackerras <paulus@...ba.org>
>> Cc: Alexander Graf <agraf@...e.de>
>> Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
>> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
>> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

So this affects 3.17?


Alex

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