[RFC][PATCH] CONFIG_NR_CPUS for 2.4.21

From: J.A. Magallon (jamagallon@able.es)
Date: Wed Jun 18 2003 - 17:23:36 EST

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Hi all...

This adds support for defining max CPU number at compile time. It is safe
for old .configs, because it defaults to current fixed max values.

Could you consider for applying ?

TIA

--- linux/Documentation/Configure.help.orig 2002-06-06 15:48:03.000000000 +0200
+++ linux/Documentation/Configure.help 2002-06-06 15:47:15.000000000 +0200
@@ -137,6 +137,16 @@

   If you don't know what to do here, say N.

+Maximum number of CPUs
+CONFIG_NR_CPUS
+ This allows you to specify the maximum number of CPUs which this
+ kernel will support. The maximum supported value is 32 for 32-bit
+ architectures and 64 for the 64-bits ones. The mimimum value which
+ makes sense is 2.
+
+ This is purely to save memory - each supported CPU adds
+ approximately eight kilobytes to the kernel image.
+
Intel or compatible 80x86 processor
CONFIG_X86
   This is Linux's home port. Linux was originally native to the Intel
--- linux/include/linux/threads.h.orig 2002-06-06 15:44:27.000000000 +0200
+++ linux/include/linux/threads.h 2002-06-06 15:45:40.000000000 +0200
@@ -9,9 +9,9 @@
  */

#ifdef CONFIG_SMP
-#define NR_CPUS 32 /* Max processors that can be running in SMP */
+#define NR_CPUS CONFIG_NR_CPUS
#else
-#define NR_CPUS 1
+#define NR_CPUS 1
#endif

#define MIN_THREADS_LEFT_FOR_ROOT 4
--- linux/arch/i386/kernel/smpboot.c.orig 2002-06-06 15:48:19.000000000 +0200
+++ linux/arch/i386/kernel/smpboot.c 2002-06-06 15:49:14.000000000 +0200
@@ -51,7 +51,7 @@
static int smp_b_stepping;

/* Setup configured maximum number of CPUs to activate */
-static int max_cpus = -1;
+static int max_cpus = NR_CPUS;

/* Total count of live CPUs */
int smp_num_cpus = 1;
@@ -1116,7 +1116,7 @@

                 if (!(phys_cpu_present_map & (1ul << bit)))
                         continue;
- if ((max_cpus >= 0) && (max_cpus <= cpucount+1))
+ if (max_cpus <= cpucount+1)
                         continue;

                 do_boot_cpu(apicid);
--- linux/arch/i386/config.in.orig 2002-06-06 15:43:12.000000000 +0200
+++ linux/arch/i386/config.in 2002-06-06 15:43:37.000000000 +0200
@@ -231,6 +231,7 @@
       define_bool CONFIG_X86_IO_APIC y
    fi
else
+ int 'Maximum number of CPUs (2-32)' CONFIG_NR_CPUS 32
    bool 'Multi-node NUMA system support' CONFIG_X86_NUMA
    if [ "$CONFIG_X86_NUMA" = "y" ]; then
       #Platform Choices
--- linux/arch/i386/defconfig Wed Jun 19 17:32:33 2002
+++ linux/arch/i386/defconfig Wed Jun 19 17:26:35 2002
@@ -64,6 +64,7 @@
CONFIG_SMP=y
# CONFIG_MULTIQUAD is not set
CONFIG_HAVE_DEC_LOCK=y
+CONFIG_NR_CPUS=32

#
# General setup
--- linux/arch/alpha/config.in Wed Jun 19 17:31:21 2002
+++ linux/arch/alpha/config.in Wed Jun 19 17:26:35 2002
@@ -257,6 +257,7 @@

if [ "$CONFIG_SMP" = "y" ]; then
    define_bool CONFIG_HAVE_DEC_LOCK y
+ int 'Maximum number of CPUs (2-64)' CONFIG_NR_CPUS 64
fi

if [ "$CONFIG_ALPHA_GENERIC" = "y" -o "$CONFIG_ALPHA_SRM" = "y" ]; then
--- linux/arch/ia64/config.in Wed Jun 19 17:32:34 2002
+++ linux/arch/ia64/config.in Wed Jun 19 17:26:35 2002
@@ -87,6 +87,10 @@
define_bool CONFIG_KCORE_ELF y # On IA-64, we always want an ELF /proc/kcore.

bool 'SMP support' CONFIG_SMP
+if [ "$CONFIG_SMP" = "y" ]; then
+ int 'Maximum number of CPUs (2-64)' CONFIG_NR_CPUS 64
+fi
+
tristate 'Support running of Linux/x86 binaries' CONFIG_IA32_SUPPORT
bool 'Performance monitor support' CONFIG_PERFMON
tristate '/proc/pal support' CONFIG_IA64_PALINFO
--- linux/arch/ia64/defconfig Wed Jun 19 17:31:23 2002
+++ linux/arch/ia64/defconfig Wed Jun 19 17:26:35 2002
@@ -42,6 +42,7 @@
CONFIG_PM=y
CONFIG_KCORE_ELF=y
CONFIG_SMP=y
+CONFIG_NR_CPUS=64
CONFIG_IA32_SUPPORT=y
CONFIG_PERFMON=y
CONFIG_IA64_PALINFO=y
--- linux/arch/mips/config-shared.in Wed Jun 19 17:32:34 2002
+++ linux/arch/mips/config-shared.in Wed Jun 19 17:26:35 2002
@@ -797,6 +797,8 @@
bool 'Magic SysRq key' CONFIG_MAGIC_SYSRQ
if [ "$CONFIG_SMP" != "y" ]; then
    bool 'Run uncached' CONFIG_MIPS_UNCACHED
+else
+ int 'Maximum number of CPUs (2-32)' CONFIG_NR_CPUS 32
fi
endmenu

--- linux/arch/mips64/defconfig Wed Jun 19 17:31:25 2002
+++ linux/arch/mips64/defconfig Wed Jun 19 17:26:35 2002
@@ -53,6 +53,7 @@
# CONFIG_REPLICATE_KTEXT is not set
# CONFIG_REPLICATE_EXHANDLERS is not set
CONFIG_SMP=y
+CONFIG_NR_CPUS=64
# CONFIG_SGI_IP32 is not set
# CONFIG_SIBYTE_SB1xxx_SOC is not set
# CONFIG_SNI_RM200_PCI is not set
--- linux/arch/parisc/config.in Wed Jun 19 17:32:34 2002
+++ linux/arch/parisc/config.in Wed Jun 19 17:26:35 2002
@@ -45,6 +45,10 @@
comment 'General options'

bool 'Symmetric multi-processing support' CONFIG_SMP
+if [ "$CONFIG_SMP" = "y" ]; then
+ int 'Maximum number of CPUs (2-32)' CONFIG_NR_CPUS 32
+fi
+
bool 'Chassis LCD and LED support' CONFIG_CHASSIS_LCD_LED

bool 'Kernel Debugger support' CONFIG_KWDB
--- linux/arch/ppc/config.in Wed Jun 19 17:31:16 2002
+++ linux/arch/ppc/config.in Wed Jun 19 17:26:35 2002
@@ -122,6 +122,7 @@
bool 'Symmetric multi-processing support' CONFIG_SMP
if [ "$CONFIG_SMP" = "y" ]; then
   bool ' Distribute interrupts on all CPUs by default' CONFIG_IRQ_ALL_CPUS
+ int 'Maximum number of CPUs (2-32)' CONFIG_NR_CPUS 32
fi

if [ "$CONFIG_6xx" = "y" -a "$CONFIG_8260" = "n" ];then
--- linux/arch/ppc64/config.in Wed Jun 19 17:31:23 2002
+++ linux/arch/ppc64/config.in Wed Jun 19 17:26:35 2002
@@ -29,6 +29,7 @@
bool 'Symmetric multi-processing support' CONFIG_SMP
if [ "$CONFIG_SMP" = "y" ]; then
   bool ' Distribute interrupts on all CPUs by default' CONFIG_IRQ_ALL_CPUS
+ int 'Maximum number of CPUs (2-64)' CONFIG_NR_CPUS 64
   if [ "$CONFIG_PPC_PSERIES" = "y" ]; then
     bool ' Hardware multithreading' CONFIG_HMT
   fi
--- linux/arch/ppc64/defconfig Wed Jun 19 17:31:23 2002
+++ linux/arch/ppc64/defconfig Wed Jun 19 17:26:35 2002
@@ -22,6 +22,7 @@
CONFIG_PPC_PSERIES=y
# CONFIG_PPC_ISERIES is not set
CONFIG_SMP=y
+CONFIG_NR_CPUS=64
CONFIG_IRQ_ALL_CPUS=y
# CONFIG_HMT is not set
# CONFIG_MSCHUNKS is not set
--- linux/arch/s390/config.in Wed Jun 19 17:31:26 2002
+++ linux/arch/s390/config.in Wed Jun 19 17:26:35 2002
@@ -32,6 +32,9 @@
comment 'Processor type and features'
bool 'Symmetric multi-processing support' CONFIG_SMP
bool 'IEEE FPU emulation' CONFIG_MATHEMU
+if [ "$CONFIG_SMP" = "y" ]; then
+ int 'Maximum number of CPUs (2-32)' CONFIG_NR_CPUS 32
+fi
endmenu

mainmenu_option next_comment
--- linux/arch/s390/defconfig Wed Jun 19 17:31:26 2002
+++ linux/arch/s390/defconfig Wed Jun 19 17:26:35 2002
@@ -27,6 +27,7 @@
#
CONFIG_SMP=y
CONFIG_MATHEMU=y
+CONFIG_NR_CPUS=64

#
# General setup
--- linux/arch/s390x/config.in Wed Jun 19 17:31:25 2002
+++ linux/arch/s390x/config.in Wed Jun 19 17:26:35 2002
@@ -22,6 +22,9 @@
mainmenu_option next_comment
comment 'Processor type and features'
bool 'Symmetric multi-processing support' CONFIG_SMP
+if [ "$CONFIG_SMP" = "y" ]; then
+ int 'Maximum number of CPUs (2-64)' CONFIG_NR_CPUS 64
+fi
bool 'Kernel support for 31 bit emulation' CONFIG_S390_SUPPORT
if [ "$CONFIG_S390_SUPPORT" = "y" ]; then
   tristate 'Kernel support for 31 bit ELF binaries' CONFIG_BINFMT_ELF32
--- linux/arch/s390x/defconfig Wed Jun 19 17:31:25 2002
+++ linux/arch/s390x/defconfig Wed Jun 19 17:26:35 2002
@@ -21,6 +21,7 @@
CONFIG_SMP=y
CONFIG_S390_SUPPORT=y
CONFIG_BINFMT_ELF32=y
+CONFIG_NR_CPUS=64

#
# Loadable module support
--- linux/arch/sparc/config.in Wed Jun 19 17:31:21 2002
+++ linux/arch/sparc/config.in Wed Jun 19 17:26:35 2002
@@ -29,6 +29,10 @@

bool 'Symmetric multi-processing support (does not work on sun4/sun4c)' CONFIG_SMP

+if [ "$CONFIG_SMP" = "y" ]; then
+ int 'Maximum number of CPUs (2-32)' CONFIG_NR_CPUS 32
+fi
+
# Identify this as a Sparc32 build
define_bool CONFIG_SPARC32 y

--- linux/arch/sparc64/config.in Wed Jun 19 17:32:35 2002
+++ linux/arch/sparc64/config.in Wed Jun 19 17:26:35 2002
@@ -28,6 +28,10 @@

bool 'Symmetric multi-processing support' CONFIG_SMP

+if [ "$CONFIG_SMP" = "y" ]; then
+ int 'Maximum number of CPUs (2-64)' CONFIG_NR_CPUS 64
+fi
+
# Identify this as a Sparc64 build
define_bool CONFIG_SPARC64 y

--- linux/arch/sparc64/defconfig Wed Jun 19 17:32:35 2002
+++ linux/arch/sparc64/defconfig Wed Jun 19 17:26:35 2002
@@ -58,6 +58,7 @@
CONFIG_BINFMT_MISC=m
# CONFIG_SUNOS_EMUL is not set
CONFIG_SOLARIS_EMUL=m
+CONFIG_NR_CPUS=64

#
# Parallel port support
--- linux/arch/x86_64/config.in Wed Jun 19 17:31:25 2002
+++ linux/arch/x86_64/config.in Wed Jun 19 17:29:25 2002
@@ -66,6 +66,7 @@
    define_bool CONFIG_X86_UP_IOAPIC y
else
    define_bool CONFIG_HAVE_DEC_LOCK y
+ int 'Maximum number of CPUs (2-64)' CONFIG_NR_CPUS 64
fi

bool 'Machine check support' CONFIG_MCE
--- linux/arch/x86_64/defconfig Wed Jun 19 17:31:25 2002
+++ linux/arch/x86_64/defconfig Wed Jun 19 17:26:35 2002
@@ -41,6 +41,7 @@
CONFIG_X86_LOCAL_APIC=y
CONFIG_MTRR=y
# CONFIG_SMP is not set
+CONFIG_NR_CPUS=64
CONFIG_HPET_TIMER=y
CONFIG_GART_IOMMU=y
CONFIG_X86_UP_IOAPIC=y

-- 
J.A. Magallon <jamagallon@able.es>      \                 Software is like sex:
werewolf.able.es                         \           It's better when it's free
Mandrake Linux release 9.2 (Cooker) for i586
Linux 2.4.21-jam1 (gcc 3.3 (Mandrake Linux 9.2 3.3-1mdk))
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Next message: Linus Torvalds: "Re: [PATCH] OProfile: IO-APIC fixup"
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