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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Message-ID: <20180823103625.GR24439@gate.crashing.org>
Date:   Thu, 23 Aug 2018 05:36:26 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Christophe LEROY <christophe.leroy@....fr>
Cc:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        aneesh.kumar@...ux.vnet.ibm.com, 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

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.

Very many things use tiny memsets like that, so you must mean something
more specialised.


Segher