linux-kernel - Re: why do we still need bootmem allocator?

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Message-ID: <CAL_Jsq+evsgh9Qi6FfG4vUZWtpC0UrFjTWSrzukMxY==TD_mrg@mail.gmail.com>
Date:   Wed, 27 Jun 2018 07:58:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     rppt@...ux.vnet.ibm.com
Cc:     mhocko@...nel.org, linux-mm@...ck.org,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list:GENERIC INCLUDE/ASM HEADER FILES" 
        <linux-arch@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: why do we still need bootmem allocator?

On Wed, Jun 27, 2018 at 4:11 AM Mike Rapoport <rppt@...ux.vnet.ibm.com> wrote:
>
> On Mon, Jun 25, 2018 at 10:09:41AM -0600, Rob Herring wrote:
> > On Mon, Jun 25, 2018 at 8:08 AM Michal Hocko <mhocko@...nel.org> wrote:
> > >
> > > Hi,
> > > I am wondering why do we still keep mm/bootmem.c when most architectures
> > > already moved to nobootmem. Is there any fundamental reason why others
> > > cannot or this is just a matter of work?
> >
> > Just because no one has done the work. I did a couple of arches
> > recently (sh, microblaze, and h8300) mainly because I broke them with
> > some DT changes.
>
> I have a patch for alpha nearly ready.
> That leaves m68k and ia64

And c6x, hexagon, mips, nios2, unicore32. Those are all the platforms
which don't select NO_BOOTMEM.

Rob