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

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Date:	Fri, 15 Aug 2014 13:00:43 +1000
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	Alexander Graf <agraf@...e.de>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	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 08/14/2014 11:40 PM, Alexander Graf wrote:
> 
> 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?

Yes.


-- 
Alexey
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