linux-kernel - Re: [PATCH] enable sparsemem without CONFIG

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Date:	Wed, 13 Aug 2008 16:15:17 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] enable sparsemem without CONFIG_NUMA


* Jeff Chua <jeff.chua.linux@...il.com> wrote:

> Linus,
>
> While testing for more than 8 cpus, I couldn't select sparsemem when 
> CONFIG_X86_GENERICARCH is selected instead of CONFIG_X86_PC.
>
> Here's a patch to enable sparsemem independent of NUMA instead of just 
> flatmem ... unless there a reason for sparsemem to depend on NUMA for 
> more than 8 CPUs?

note, i already queued this up in tip/x86/defconfig two days ago, for 
v2.6.28.

	Ingo

---------------------->
>From 99809963c99e1ed868d9ebeb4a5e7ee1cbe0309f Mon Sep 17 00:00:00 2001
From: Jeff Chua <jeff.chua.linux@...il.com>
Date: Wed, 6 Aug 2008 19:09:53 +0800
Subject: [PATCH] x86: make sparsemem more available

With CONFIG_X86_PC, I can set CONFIG_SPARSEMEM=y.

With CONFIG_X86_GENERICARCH, CONFIG_SPARSEMEM depends on CONFIG_NUMA.

I'm using the patch below to enable sparsemem instead of flatmem.
System booted and is running.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/Kconfig |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 7917962..e2305c7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1035,7 +1035,7 @@ config HAVE_ARCH_ALLOC_REMAP
 
 config ARCH_FLATMEM_ENABLE
 	def_bool y
-	depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
+	depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
 
 config ARCH_DISCONTIGMEM_ENABLE
 	def_bool y
@@ -1051,7 +1051,7 @@ config ARCH_SPARSEMEM_DEFAULT
 
 config ARCH_SPARSEMEM_ENABLE
 	def_bool y
-	depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
+	depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC) || X86_GENERICARCH
 	select SPARSEMEM_STATIC if X86_32
 	select SPARSEMEM_VMEMMAP_ENABLE if X86_64
 
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