linux-kernel - [2.6 patch] ia64: let NUMA select SMP

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Date:	Fri, 25 Apr 2008 03:41:39 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-ia64@...r.kernel.org, Mike Travis <travis@....com>,
	Russ Anderson <rja@....com>
Subject: [2.6 patch] ia64: let NUMA select SMP

On Thu, Apr 24, 2008 at 05:25:06PM -0700, Luck, Tony wrote:
> >>       Build fix for CONFIG_NUMA=y && CONFIG_SMP=n
> >>...
> >
> > Why is this an allowed configuration on ia64?
> 
> It shows up in allnoconfig ... probably because some
> bit of Kconfig forces NUMA=y.

allnoconfig results in CONFIG_IA64_GENERIC=y, which in turn selects NUMA.

What about the patch below instead?

> I can't imagine that it is ever a useful combination ... except to
> find places in the code where people have:
> 
> #if defined(CONFIG_SMP)
>  ...
> #else
> 
> #if defined(CONFIG_NUMA) // !!! SMP=n, NUMA code???
>   ...
> #endif
> #endif
> 
> 
> Which is what happened, and is being fixed, here.

If it isn't a useful combination such code makes no sense.

> -Tony

cu
Adrian


<--  snip  -->


CONFIG_NUMA=y, CONFIG_SMP=n isn't a useful combination, so let NUMA 
select SMP.

Signed-off-by: Adrian Bunk <bunk@...nel.org>

---
a94d43a82a3c5a95c82b9688e5adebca6dcb7acb diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index cd13e13..19e8167 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -387,6 +387,7 @@ config NUMA
 	bool "NUMA support"
 	depends on !IA64_HP_SIM && !FLATMEM
 	default y if IA64_SGI_SN2
+	select SMP
 	select ACPI_NUMA if ACPI
 	help
 	  Say Y to compile the kernel to support NUMA (Non-Uniform Memory


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