[PATCH] Configurable NODES_SHIFT

Current implementations define NODES_SHIFT in include/asm-xxx/numnodes.h for
each arch.  Its definition is sometimes configurable.  Indeed, ia64 defines 5
NODES_SHIFT values in the current git tree.  But it looks a bit messy.

SGI-SN2(ia64) system requires 1024 nodes, and the number of nodes already has
been changeable by config.  Suitable node's number may be changed in the
future even if it is other architecture.  So, I wrote configurable node's
number.

This patch set defines just default value for each arch which needs multi
nodes except ia64.  But, it is easy to change to configurable if necessary.

On ia64 the number of nodes can be already configured in generic ia64 and SN2
config.  But, NODES_SHIFT is defined for DIG64 and HP'S machine too.  So, I
changed it so that all platforms can be configured via CONFIG_NODES_SHIFT.  It
would be simpler.

See also: http://marc.theaimsgroup.com/?l=linux-kernel&m=114358010523896&w=2

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 9bef61b303674e3be48a0fbb403ee7d85c126e30..8290b69da20214a7e19fedd0fc047d33d5d82ba7 100644 (file)
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -549,6 +549,11 @@ config NUMA
          Access).  This option is for configuring high-end multiprocessor
          server machines.  If in doubt, say N.
 
+config NODES_SHIFT
+       int
+       default "7"
+       depends on NEED_MULTIPLE_NODES
+
 # LARGE_VMALLOC is racy, if you *really* need it then fix it first
 config ALPHA_LARGE_VMALLOC
        bool

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index dc5a9332c91597f7cbc82d06db7be40138f7d551..1dbf6ddb300d2b5a9cfafd9e064dffee468dec52 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -512,6 +512,12 @@ config ARCH_DISCONTIGMEM_ENABLE
          or have huge holes in the physical address space for other reasons.
          See <file:Documentation/vm/numa> for more.
 
+config NODES_SHIFT
+       int
+       default "4" if ARCH_LH7A40X
+       default "2"
+       depends on NEED_MULTIPLE_NODES
+
 source "mm/Kconfig"
 
 config LEDS

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 57301db056f59d49004e0a6aa41f6606142822a9..18ec9fe6deb69d887a1f48a204c7b126cb633e04 100644 (file)
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -522,6 +522,12 @@ config NUMA
 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
        depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)
 
+config NODES_SHIFT
+       int
+       default "4" if X86_NUMAQ
+       default "3"
+       depends on NEED_MULTIPLE_NODES
+
 config HAVE_ARCH_BOOTMEM_NODE
        bool
        depends on NUMA

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index edffe25a477ab597a6615288df78ebdf976a0bba..9f40eeff0b5cec3cfec4ddfc6143fc30ca852b85 100644 (file)
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -260,15 +260,6 @@ config NR_CPUS
          than 64 will cause the use of a CPU mask array, causing a small
          performance hit.
 
-config IA64_NR_NODES
-       int "Maximum number of NODEs (256-1024)" if (IA64_SGI_SN2 || IA64_GENERIC)
-       range 256 1024
-       depends on IA64_SGI_SN2 || IA64_GENERIC
-       default "256"
-       help
-         This option specifies the maximum number of nodes in your SSI system.
-         If in doubt, use the default.
-
 config HOTPLUG_CPU
        bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
        depends on SMP && EXPERIMENTAL
@@ -352,6 +343,16 @@ config NUMA
          Access).  This option is for configuring high-end multiprocessor
          server systems.  If in doubt, say N.
 
+config NODES_SHIFT
+       int "Max num nodes shift(3-10)"
+       range 3 10
+       default "8"
+       depends on NEED_MULTIPLE_NODES
+       help
+         This option specifies the maximum number of nodes in your SSI system.
+         MAX_NUMNODES will be 2^(This value).
+         If in doubt, use the default.
+
 # VIRTUAL_MEM_MAP and FLAT_NODE_MEM_MAP are functionally equivalent.
 # VIRTUAL_MEM_MAP has been retained for historical reasons.
 config VIRTUAL_MEM_MAP

diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 05c864c6c2d937e31f893c3b1aa783e190906c33..41fd490af3b47a93c70e829a561506151f1e6e09 100644 (file)
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -285,6 +285,11 @@ config NUMA
        depends on SMP && BROKEN
        default n
 
+config NODES_SHIFT
+       int
+       default "1"
+       depends on NEED_MULTIPLE_NODES
+
 # turning this on wastes a bunch of space.
 # Summit needs it only when NUMA is on
 config BOOT_IOREMAP

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index e15709ce886626158aba18c05851cb5bc04065c6..7aec60d4042091b1648b3f491194477cd266f909 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1590,6 +1590,11 @@ config ARCH_FLATMEM_ENABLE
        def_bool y
        depends on !NUMA
 
+config NODES_SHIFT
+       int
+       default "6"
+       depends on NEED_MULTIPLE_NODES
+
 source "mm/Kconfig"
 
 config SMP

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 2fdf21989dc20a88d0d288bdf190dd3837bf8aaf..19f911c5dd58dce00114fc4ed397c7445952a6f8 100644 (file)
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -177,6 +177,11 @@ config ARCH_DISCONTIGMEM_DEFAULT
        def_bool y
        depends on ARCH_DISCONTIGMEM_ENABLE
 
+config NODES_SHIFT
+       int
+       default "3"
+       depends on NEED_MULTIPLE_NODES
+
 source "kernel/Kconfig.preempt"
 source "kernel/Kconfig.hz"
 source "mm/Kconfig"

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 2cdc35ce80451c5e503e97904cd763474d63b752..167e70e95556c0a7f6a281a96114773e46418fe9 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -649,6 +649,11 @@ config NUMA
        depends on PPC64
        default y if SMP && PPC_PSERIES
 
+config NODES_SHIFT
+       int
+       default "4"
+       depends on NEED_MULTIPLE_NODES
+
 config ARCH_SELECT_MEMORY_MODEL
        def_bool y
        depends on PPC64

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 58583f4594719ddcd5da635bec148858ef5807fc..2bcecf42257343e0b2af310bf0b43b2b16fc3e93 100644 (file)
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -527,6 +527,11 @@ config CPU_HAS_SR_RB
          See <file:Documentation/sh/register-banks.txt> for further
          information on SR.RB and register banking in the kernel in general.
 
+config NODES_SHIFT
+       int
+       default "1"
+       depends on NEED_MULTIPLE_NODES
+
 endmenu
 
 menu "Boot options"

diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 7df2fe1844be737aee6f377906ddc39bc6c0fcf1..408d44a59756f8050c4455fdbb471eb9c9881f09 100644 (file)
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -288,6 +288,11 @@ config K8_NUMA
         Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
         instead, which also takes priority if both are compiled in.   
 
+config NODES_SHIFT
+       int
+       default "6"
+       depends on NEED_MULTIPLE_NODES
+
 # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
 
 config X86_64_ACPI_NUMA

diff --git a/include/asm-alpha/numnodes.h b/include/asm-alpha/numnodes.h
deleted file mode 100644 (file)
index cd42582..0000000
--- a/include/asm-alpha/numnodes.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef _ASM_MAX_NUMNODES_H
-#define _ASM_MAX_NUMNODES_H
-
-/* Max 128 Nodes - Marvel */
-#define NODES_SHIFT    7
-
-#endif /* _ASM_MAX_NUMNODES_H */

diff --git a/include/asm-arm/arch-lh7a40x/memory.h b/include/asm-arm/arch-lh7a40x/memory.h
index c92bcb8376295912d2839a196311029243a3895c..9f1a58cbf407dfa1a3b37b8caac598bd0c5aa872 100644 (file)
--- a/include/asm-arm/arch-lh7a40x/memory.h
+++ b/include/asm-arm/arch-lh7a40x/memory.h
@@ -31,8 +31,6 @@
 
 #ifdef CONFIG_DISCONTIGMEM
 
-#define NODES_SHIFT    4       /* Up to 16 nodes */
-
 /*
  * Given a kernel address, find the home node of the underlying memory.
  */

diff --git a/include/asm-arm/numnodes.h b/include/asm-arm/numnodes.h
deleted file mode 100644 (file)
index 8df3681..0000000
--- a/include/asm-arm/numnodes.h
+++ /dev/null
@@ -1,26 +0,0 @@
-/*
- *  linux/include/asm-arm/numnodes.h
- *
- *  Copyright (C) 2002 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/* This declaration for the size of the NUMA (CONFIG_DISCONTIGMEM)
- * memory node table is the default.
- *
- * A good place to override this value is include/asm/arch/memory.h.
- */
-
-#ifndef __ASM_ARM_NUMNODES_H
-#define __ASM_ARM_NUMNODES_H
-
-#include <asm/memory.h>
-
-#ifndef NODES_SHIFT
-# define NODES_SHIFT   2       /* Normally, Max 4 Nodes */
-#endif
-
-#endif

diff --git a/include/asm-i386/numnodes.h b/include/asm-i386/numnodes.h
deleted file mode 100644 (file)
index a61f38c..0000000
--- a/include/asm-i386/numnodes.h
+++ /dev/null
@@ -1,18 +0,0 @@
-#ifndef _ASM_MAX_NUMNODES_H
-#define _ASM_MAX_NUMNODES_H
-
-#include <linux/config.h>
-
-#ifdef CONFIG_X86_NUMAQ
-
-/* Max 16 Nodes */
-#define NODES_SHIFT    4
-
-#elif defined(CONFIG_ACPI_SRAT)
-
-/* Max 8 Nodes */
-#define NODES_SHIFT    3
-
-#endif /* CONFIG_X86_NUMAQ */
-
-#endif /* _ASM_MAX_NUMNODES_H */

diff --git a/include/asm-ia64/numnodes.h b/include/asm-ia64/numnodes.h
deleted file mode 100644 (file)
index e9d356f..0000000
--- a/include/asm-ia64/numnodes.h
+++ /dev/null
@@ -1,20 +0,0 @@
-#ifndef _ASM_MAX_NUMNODES_H
-#define _ASM_MAX_NUMNODES_H
-
-#ifdef CONFIG_IA64_DIG
-/* Max 8 Nodes */
-#  define NODES_SHIFT  3
-#elif defined(CONFIG_IA64_HP_ZX1) || defined(CONFIG_IA64_HP_ZX1_SWIOTLB)
-/* Max 32 Nodes */
-#  define NODES_SHIFT  5
-#elif defined(CONFIG_IA64_SGI_SN2) || defined(CONFIG_IA64_GENERIC)
-#  if CONFIG_IA64_NR_NODES == 256
-#    define NODES_SHIFT        8
-#  elif CONFIG_IA64_NR_NODES <= 512
-#    define NODES_SHIFT    9
-#  elif CONFIG_IA64_NR_NODES <= 1024
-#    define NODES_SHIFT    10
-#  endif
-#endif
-
-#endif /* _ASM_MAX_NUMNODES_H */

diff --git a/include/asm-m32r/numnodes.h b/include/asm-m32r/numnodes.h
deleted file mode 100644 (file)
index 479a39d..0000000
--- a/include/asm-m32r/numnodes.h
+++ /dev/null
@@ -1,15 +0,0 @@
-#ifndef _ASM_NUMNODES_H_
-#define _ASM_NUMNODES_H_
-
-#include <linux/config.h>
-
-#ifdef CONFIG_DISCONTIGMEM
-
-#if defined(CONFIG_CHIP_M32700)
-#define        NODES_SHIFT     1       /* Max 2 Nodes */
-#endif /* CONFIG_CHIP_M32700 */
-
-#endif /* CONFIG_DISCONTIGMEM */
-
-#endif /* _ASM_NUMNODES_H_ */
-

diff --git a/include/asm-mips/numnodes.h b/include/asm-mips/numnodes.h
deleted file mode 100644 (file)
index 4f00c16..0000000
--- a/include/asm-mips/numnodes.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef _ASM_MAX_NUMNODES_H
-#define _ASM_MAX_NUMNODES_H
-
-/* Max 128 Nodes */
-#define NODES_SHIFT    6
-
-#endif /* _ASM_MAX_NUMNODES_H */

diff --git a/include/asm-parisc/numnodes.h b/include/asm-parisc/numnodes.h
deleted file mode 100644 (file)
index 6c67651..0000000
--- a/include/asm-parisc/numnodes.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef _ASM_MAX_NUMNODES_H
-#define _ASM_MAX_NUMNODES_H
-
-/* Max 8 Nodes */
-#define NODES_SHIFT    3
-
-#endif /* _ASM_MAX_NUMNODES_H */

diff --git a/include/asm-powerpc/numnodes.h b/include/asm-powerpc/numnodes.h
deleted file mode 100644 (file)
index e138eda..0000000
--- a/include/asm-powerpc/numnodes.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#ifndef _ASM_POWERPC_MAX_NUMNODES_H
-#define _ASM_POWERPC_MAX_NUMNODES_H
-#ifdef __KERNEL__
-
-/* Max 16 Nodes */
-#define NODES_SHIFT    4
-
-#endif /* __KERNEL__ */
-#endif /* _ASM_POWERPC_MAX_NUMNODES_H */

diff --git a/include/asm-sh/numnodes.h b/include/asm-sh/numnodes.h
deleted file mode 100644 (file)
index f73e85b..0000000
--- a/include/asm-sh/numnodes.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef _ASM_MAX_NUMNODES_H
-#define _ASM_MAX_NUMNODES_H
-
-/* Max 2 Nodes */
-#define NODES_SHIFT    1
-
-#endif /* _ASM_MAX_NUMNODES_H */

diff --git a/include/asm-x86_64/numa.h b/include/asm-x86_64/numa.h
index f0ba4d984bdf7f561d759480d54990d968729be3..1cc92fe02503d00abee3782364dfad767e19386f 100644 (file)
--- a/include/asm-x86_64/numa.h
+++ b/include/asm-x86_64/numa.h
@@ -2,7 +2,6 @@
 #define _ASM_X8664_NUMA_H 1
 
 #include <linux/nodemask.h>
-#include <asm/numnodes.h>
 
 struct bootnode {
        u64 start,end; 

diff --git a/include/asm-x86_64/numnodes.h b/include/asm-x86_64/numnodes.h
deleted file mode 100644 (file)
index 5a1d506..0000000
--- a/include/asm-x86_64/numnodes.h
+++ /dev/null
@@ -1,10 +0,0 @@
-#ifndef _ASM_X8664_NUMNODES_H
-#define _ASM_X8664_NUMNODES_H 1
-
-#include <linux/config.h>
-
-#ifdef CONFIG_NUMA
-#define NODES_SHIFT    6
-#endif
-
-#endif

diff --git a/include/linux/numa.h b/include/linux/numa.h
index f0c539bd3cfc44e07eaafc26bcf358c29c0fc65f..e481feb1bfd81e061e3c2488ece336f936fdc9d6 100644 (file)
--- a/include/linux/numa.h
+++ b/include/linux/numa.h
@@ -3,11 +3,9 @@
 
 #include <linux/config.h>
 
-#ifndef CONFIG_FLATMEM
-#include <asm/numnodes.h>
-#endif
-
-#ifndef NODES_SHIFT
+#ifdef CONFIG_NODES_SHIFT
+#define NODES_SHIFT     CONFIG_NODES_SHIFT
+#else
 #define NODES_SHIFT     0
 #endif