Re: [PATCH]: expose FORCE_MAX_ZONEORDER on x86

[Marc Leeman <marc.leeman@gmail.com>]

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> > I guess we could do this - but you forgot to sign off on your 
> > patch.
> 
> It took me some time, but I finally rebased the patch against 3.3

Sorry, the previous patch gave a (sloppy) whitespace warning, refreshed
it.

-- 
  greetz, marc
harvey 2.6.29.1 #1 PREEMPT Mon Apr 6 22:33:31 CDT 2009 GNU/Linux

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From 463bf232150089ee114ebc9712890ff5b0aca9c5 Mon Sep 17 00:00:00 2001
From: Marc Leeman <marc.leeman@gmail.com>
Date: Thu, 5 Apr 2012 14:25:22 +0200
Subject: KConfig x86: enable FORCE_MAX_ZONEORDER

Larger blocks of memory can be required for e.g. higher resolutions on
some capture card drivers; this patch just enables an already
available configuration option on x86 (it was already exposed on other
architectures).

The default is set to 11, as in
./include/linux/mmzone.h

[barco@nmgserver001 linux-3.0]$ find . -name Kconfig | xargs grep FORCE_MAX_ZONEORDER
./arch/ia64/Kconfig:config FORCE_MAX_ZONEORDER
./arch/cris/Kconfig:config FORCE_MAX_ZONEORDER
./arch/arm/Kconfig:config FORCE_MAX_ZONEORDER
./arch/s390/Kconfig:config FORCE_MAX_ZONEORDER
./arch/mips/Kconfig:config FORCE_MAX_ZONEORDER
./arch/sh/mm/Kconfig:config FORCE_MAX_ZONEORDER
./arch/blackfin/Kconfig:config FORCE_MAX_ZONEORDER
./arch/powerpc/Kconfig:config FORCE_MAX_ZONEORDER


Signed-off-by: Marc Leeman <marc.leeman@barco.com>
---
 arch/x86/Kconfig |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1d14cc6..ba4ed6a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1296,6 +1296,22 @@ config ILLEGAL_POINTER_VALUE
 
 source "mm/Kconfig"
 
+config FORCE_MAX_ZONEORDER
+	int "Maximum zone order" 
+	range 11 64
+	default "11"
+	help
+	  The kernel memory allocator divides physically contiguous memory
+	  blocks into "zones", where each zone is a power of two number of
+	  pages.  This option selects the largest power of two that the kernel
+	  keeps in the memory allocator.  If you need to allocate very large
+	  blocks of physically contiguous memory, then you may need to
+	  increase this value.
+
+	  This config option is actually maximum order plus one. For example,
+	  a value of 11 means that the largest free memory block is 2^10 pages.
+
+
 config HIGHPTE
 	bool "Allocate 3rd-level pagetables from highmem"
 	depends on HIGHMEM
-- 
1.7.2.5


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