linux-kernel - Re: [v6 04/15] mm: discard memblock data later

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Date:   Mon, 14 Aug 2017 13:34:45 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Pasha Tatashin <pasha.tatashin@...cle.com>
Cc:     linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        x86@...nel.org, kasan-dev@...glegroups.com, borntraeger@...ibm.com,
        heiko.carstens@...ibm.com, davem@...emloft.net,
        willy@...radead.org, ard.biesheuvel@...aro.org,
        will.deacon@....com, catalin.marinas@....com, sam@...nborg.org,
        Mel Gorman <mgorman@...e.de>
Subject: Re: [v6 04/15] mm: discard memblock data later

On Fri 11-08-17 15:00:47, Pasha Tatashin wrote:
> Hi Michal,
> 
> This suggestion won't work, because there are arches without memblock
> support: tile, sh...
> 
> So, I would still need to have:
> 
> #ifdef CONFIG_MEMBLOCK in page_alloc, or define memblock_discard() stubs in
> nobootmem headfile. 

This is the standard way to do this. And it is usually preferred to
proliferate ifdefs in the code.
-- 
Michal Hocko
SUSE Labs