linux-kernel - Re: [PATCH v2 3/4] powerpc/mm: fix a warning when a cache is common to PGD and hugepages

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Date:   Thu, 23 Aug 2018 16:50:41 +0200
From:   Christophe LEROY <christophe.leroy@....fr>
To:     Segher Boessenkool <segher@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        aneesh.kumar@...ux.vnet.ibm.com
Cc:     Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Russell Currey <ruscur@...sell.cc>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] powerpc/mm: fix a warning when a cache is common
 to PGD and hugepages



Le 23/08/2018 à 16:41, Segher Boessenkool a écrit :
> On Thu, Aug 23, 2018 at 11:32:16PM +1000, Andrew Donnellan wrote:
>> On 23/08/18 21:56, Michael Ellerman wrote:
>>> Christophe LEROY <christophe.leroy@....fr> writes:
>>>
>>>> Le 23/08/2018 à 12:36, Segher Boessenkool a écrit :
>>>>> On Thu, Aug 23, 2018 at 11:40:22AM +0200, Christophe LEROY wrote:
>>>>>> The only small problème I have is that some version of GCC seems to
>>>>>> complain about big memset() (132k and 256k ones). Is there a way to tell
>>>>>> GCC we really want to do it ?
>>>>>
>>>>> I'm not sure what you mean.  Complain, is that a warning, is that an
>>>>> error?
>>>>> What does it say?  Do you have some example code to reproduce it?  Etc.
>>>>
>>>> I saw the warnings in the checks at
>>>> https://patchwork.ozlabs.org/patch/957566/
>>>> Unfortunatly the link is now broken.
>>>
>>> ruscur/ajd any idea what happened to the snowpatch links here?
>>
>> I think they've disappeared because our log rotation is too fast - I've
>> now upped it to 30 days. I guess over time we'll figure out what we need
>> in this regard, ideally we'd keep logs indefinitely but they're several
>> megs per build.
>>
>> I've kicked off another build for this series and the links in Patchwork
>> should update to point to the new job when it's done (probably in the
>> next couple of hours).
> 
> It's back, thanks Andrew!
> 
> The warnings are not from GCC at all: the warnings are from sparse.

Oh, ok, my mistake, I reminded seeing those warnings without paying much 
attention to them at that time.

Anyway, should we do anything about this warning ? If so, what 
could/should be done ?

Christophe