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Date:   Fri, 27 Jul 2018 17:07:30 +0200
From:   Oscar Salvador <osalvador@techadventures.net>
To:     Pavel Tatashin <pasha.tatashin@oracle.com>
Cc:     Steven Sistare <steven.sistare@oracle.com>,
        Daniel Jordan <daniel.m.jordan@oracle.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        kirill.shutemov@linux.intel.com, Michal Hocko <mhocko@suse.com>,
        Linux Memory Management List <linux-mm@kvack.org>,
        dan.j.williams@intel.com, jack@suse.cz, jglisse@redhat.com,
        Souptick Joarder <jrdr.linux@gmail.com>, bhe@redhat.com,
        gregkh@linuxfoundation.org, Vlastimil Babka <vbabka@suse.cz>,
        Wei Yang <richard.weiyang@gmail.com>, dave.hansen@intel.com,
        rientjes@google.com, mingo@kernel.org, abdhalee@linux.vnet.ibm.com,
        mpe@ellerman.id.au
Subject: Re: [PATCH v2 2/3] mm: calculate deferred pages after skipping
 mirrored memory
Message-ID: <20180727150730.GA14428@techadventures.net>
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 <20180727115645.GA13637@techadventures.net>
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On Fri, Jul 27, 2018 at 10:53:24AM -0400, Pavel Tatashin wrote:
>                          unsigned long *nr_initialised)
> > > +static bool __meminit
> > > +defer_init(int nid, unsigned long pfn, unsigned long end_pfn)
> >
> > Hi Pavel,
> >
> > maybe I do not understand properly the __init/__meminit macros, but should not
> > "defer_init" be __init instead of __meminit?
> > I think that functions marked as __meminit are not freed up, right?
> 
> Not exactly. As I understand: __meminit is the same as __init when
> CONFIG_MEMORY_HOTPLUG=n. But, when memory hotplug is configured,
> __meminit is not freed, because code that adds memory is shared
> between boot and hotplug. In this case defer_init() is called only
> during boot, and could be __init, but it is called from
> memmap_init_zone() which is __meminit and thus section mismatch would
> happen.

Oh yes, I did not think about memmap_init_zone(), you are right.
Then, nothing to argue about ;-).

Thanks
-- 
Oscar Salvador
SUSE L3