linux-kernel - Re: [patch] slub: Revert "[PARISC] slub: fix panic with DISCONTIGMEM"

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Message-ID: <BANLkTikf9Qtp1nq8E9sDjEgoYUO-25vsWQ@mail.gmail.com>
Date:	Wed, 11 May 2011 09:27:14 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	James Bottomley <James.Bottomley@...e.de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>, stable@...nel.org,
	linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch] slub: Revert "[PARISC] slub: fix panic with DISCONTIGMEM"

On Wed, May 11, 2011 at 02:08, David Rientjes <rientjes@...gle.com> wrote:
> On Mon, 9 May 2011, James Bottomley wrote:
>> > Great, and if that works out successfully this time around I think we'll
>> > either need to fix each individual arch Kconfig that we know doesn't work
>> > well (at least parisc because of the scheduling issue) so that it at least
>> > enables CONFIG_NUMA implicitly for discontigmem unless CONFIG_BROKEN is
>> > set.
>>
>> OK, I confirm that the N_NORMAL_MEMORY patch on its own fixes slub for
>> us.  We can revert the mark slub BROKEN in DISCONTIGMEM && !NUMA patch.
>>
>
> Ok, so we need to revert 4a5fa3590f09 ([PARISC] slub: fix panic with
> DISCONTIGMEM) that did not allow CONFIG_SLUB to be set for architectures
> that use DISCONTIGMEM without NUMA support unless they have CONFIG_BROKEN
> set from Linus' tree _and_ from the stable trees.
>
>
>
> slub: Revert "[PARISC] slub: fix panic with DISCONTIGMEM"
>
> 4a5fa3590f09 ([PARISC] slub: fix panic with DISCONTIGMEM) did not allow
> SLUB to be used on architectures that use DISCONTIGMEM without compiling
> NUMA support without CONFIG_BROKEN also set.
>
> The slub panic that it was intended to prevent is addressed by
> d9b41e0b54fd ([PARISC] set memory ranges in N_NORMAL_MEMORY when onlined)
> on parisc so there is no further slub issues with such a configuration.

Please also refer to the N_NORMAL_MEMORY fixes for the other arches,
esp. for stable.

> This reverts the former commit so that SLUB may now be used on such
> architectures since there haven't been any reports of additional errors.
>
> Cc: James Bottomley <James.Bottomley@...e.de>
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: stable@...nel.org

> ---
>  init/Kconfig |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
>
> diff --git a/init/Kconfig b/init/Kconfig
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1226,7 +1226,6 @@ config SLAB
>          per cpu and per node queues.
>
>  config SLUB
> -       depends on BROKEN || NUMA || !DISCONTIGMEM
>        bool "SLUB (Unqueued Allocator)"
>        help
>           SLUB is a slab allocator that minimizes cache line usage

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
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