linux-kernel - Re: [PATCH] mm: make __paginginit based on CONFIG_MEMORY

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Message-ID: <20180731131742.GB473@techadventures.net>
Date:   Tue, 31 Jul 2018 15:17:42 +0200
From:   Oscar Salvador <osalvador@...hadventures.net>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Pavel Tatashin <pasha.tatashin@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        kirill.shutemov@...ux.intel.com, iamjoonsoo.kim@....com,
        Mel Gorman <mgorman@...e.de>,
        Souptick Joarder <jrdr.linux@...il.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, osalvador@...e.de
Subject: Re: [PATCH] mm: make __paginginit based on CONFIG_MEMORY_HOTPLUG

On Tue, Jul 31, 2018 at 03:04:34PM +0200, Michal Hocko wrote:
> On Tue 31-07-18 08:49:11, Pavel Tatashin wrote:
> > Hi Oscar,
> > 
> > Have you looked into replacing __paginginit via __meminit ? What is
> > the reason to keep both?
> 
> All these init variants make my head spin so reducing their number is
> certainly a desirable thing to do. b5a0e01132943 has added this variant
> so it might give a clue about the dependencies.

Looking at b5a0e011329431b90d315eaf6ca5fdb41df7a117, I cannot really see why
this was not done in init.h
Maybe the comitter did not want to hack directly into __meminit.

I think that __paginginit was a way to abstract the whole thing without having
to modify init.h directly.

I guess we could get rid of it and so something like:

#ifdef CONFIG_MEMORY_HOTPLUG
 #define __meminit        __section(.meminit.text) __cold notrace \
                                                  __latent_entropy
#else
#define __meminit       __init
#endif

And then we would have to replace __paginginit with __meminit.

But honestly, puting an #ifdef in init.h feels a bit wierd to me,
although I do not really have a strong opinion here.

Thanks
-- 
Oscar Salvador
SUSE L3