linux-kernel - Re: [PATCH 1/3] powerpc/32: Fix hugepage allocation on 8xx at hint address

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Message-Id: <87y3kxrrc2.fsf@linux.vnet.ibm.com>
Date:   Wed, 17 Jan 2018 10:53:41 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:     Christophe LEROY <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Scott Wood <oss@...error.net>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] powerpc/32: Fix hugepage allocation on 8xx at hint address

Christophe LEROY <christophe.leroy@....fr> writes:

>>
>>> How should I split in separate patches ? Something like ?
>>> 1/ Slice support for PPC32 > 2/ Activate slice for 8xx
>> 
>> Yes something like that. Will you  be able to avoid that
>>   if (SLICE_NUM_HIGH) from the code? That makes the code ugly. Right now 
>> i don't have definite suggestion on what we could do though.
>> 
>
> Could use #ifdefs instead, but in my mind it would be even more ugly.
>
> I would have liked just doing nothing, but the issue is that at the 
> moment bitmap_xxx() functions are not prepared to handle bitmaps of size 
> zero. Should we try to change that ? Any chance to succeed ?
>

How much code duplication it is to do slice_32.c?

Michael,

What do you suggest here?

-aneesh