linux-kernel - Re: [PATCH 02/11] mm/slab: remove BAD_ALIEN

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Message-ID: <CAMuHMdU7WzkTccN_wa_LB+qx=1f_4V0SSRF+XqNdgYvCb2o5Ng@mail.gmail.com>
Date:	Mon, 28 Mar 2016 10:58:38 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	JoonSoo Kim <js1304@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Linux MM <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 02/11] mm/slab: remove BAD_ALIEN_MAGIC again

Hi Jonsoo,

On Mon, Mar 28, 2016 at 7:26 AM,  <js1304@...il.com> wrote:
> From: Joonsoo Kim <iamjoonsoo.kim@....com>
>
> Initial attemp to remove BAD_ALIEN_MAGIC is once reverted by
> 'commit edcad2509550 ("Revert "slab: remove BAD_ALIEN_MAGIC"")'
> because it causes a problem on m68k which has many node
> but !CONFIG_NUMA. In this case, although alien cache isn't used
> at all but to cope with some initialization path, garbage value
> is used and that is BAD_ALIEN_MAGIC. Now, this patch set
> use_alien_caches to 0 when !CONFIG_NUMA, there is no initialization
> path problem so we don't need BAD_ALIEN_MAGIC at all. So remove it.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

I gave this a try on m68k/ARAnyM, and it didn't crash, unlike the previous
version that was reverted, so
Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds