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From: Sam Ravnborg <>
To: David Miller <>
Subject: Re: [GIT]: Make LMB code sharable with sparc64.
Date: Wed, 13 Feb 2008 09:57:35 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Wed, Feb 13, 2008 at 12:41:20AM -0800, David Miller wrote:
> As I mentioned to a few ppc folks at LCA08 I plan to use
> the LMB code from powerpc as a basis for NUMA support on
> sparc64.
> There are two changes.
> 1) Move arch/powerpc/mm/lmb.c to lib/lmb.c, put the main
>    interface bits in include/linux/lmb.h, put arch-specific
>    bits in asm/lmb.h and add Kconfig machinery to build this
>    stuff on sparc64.
> 2) Fix a bug in lmb_alloc() wherein the size was not aligned
>    so we could easily run out of reserve blocks because
>    every aligned allocation would create a tiny hole, and
>    secondly the lmb_reserve() call there did not have it's
>    return value checked.
> Powerpc folks, if there are no objections please pull, thanks!
> The following changes since commit 96b5a46e2a72dc1829370c87053e0cd558d58bc0:
>   Linus Torvalds (1):
>         WMI: initialize wmi_blocks.list even if ACPI is disabled
> are available in the git repository at:
> master

Review had been easier if the patch was inlined.
Took a quick look at the small Kconfig bits.

>From arch/sparc64/Kconfig:
+config LMB
+       def_bool y

Can we plase have this changed to use:

 config SPARC64
+	select HAVE_LMB

And then in lib/Kconfig have
+config HAVE_LMB
+	bool

So we avoid creating a new variable each time we introdce LMB support.
You would need to update powerpc Kconfig too of course.

This way of doing it is documented in:


  reply	other threads:[~2008-02-13  8:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-13  8:41 David Miller
2008-02-13  8:57 ` Sam Ravnborg [this message]
2008-02-13  9:05   ` David Miller
2008-02-13 12:12 ` Michael Ellerman
2008-02-13 13:12 ` Kumar Gala
2008-02-13 22:24   ` David Miller

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