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:   Fri, 24 Aug 2018 15:44:42 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Segher Boessenkool <segher@...nel.crashing.org>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>
Cc:     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>,
        aneesh.kumar@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org,
        Christophe LEROY <christophe.leroy@....fr>
Subject: Re: [PATCH v2 3/4] powerpc/mm: fix a warning when a cache is common to PGD and hugepages

Segher Boessenkool <segher@...nel.crashing.org> writes:

> 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.

We really need to split them out so it's less confusing.

cheers