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x86/Kconfig: Simplify NR_CPUS config 

Clean up and simplify the X86 NR_CPUS Kconfig symbol/option by
introducing RANGE_BEGIN_CPUS, RANGE_END_CPUS, and DEF_CONFIG_CPUS.
Then combine some default values when their conditionals can be
reduced.

Also move the X86_BIGSMP kconfig option inside an "if X86_32"/"endif"
config block and drop its explicit "depends on X86_32".

Combine the max. 8192 cases of RANGE_END_CPUS (X86_64 only).
Split RANGE_END_CPUS and DEF_CONFIG_CPUS into separate cases for
X86_32 and X86_64.

Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/0b833246-ed4b-e451-c426-c4464725be92@infradead.org
Link: lkml.kernel.org/r/CA+55aFzOd3j6ZUSkEwTdk85qtt1JywOtm3ZAb-qAvt8_hJ6D4A@mail.gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
hifive-unleashed-5.1
Randy Dunlap 2018-02-09 16:51:03 -08:00 committed by Ingo Molnar
parent c80c5ec1b2
commit a0d0bb4deb
1 changed files with 42 additions and 15 deletions
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57
arch/x86/Kconfig
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@ -423,12 +423,6 @@ config X86_MPPARSE
For old smp systems that do not have proper acpi support. Newer systems
(esp with 64bit cpus) with acpi support, MADT and DSDT will override it
config X86_BIGSMP
bool "Support for big SMP systems with more than 8 CPUs"
depends on X86_32 && SMP
---help---
This option is needed for the systems that have more than 8 CPUs
config GOLDFISH
def_bool y
depends on X86_GOLDFISH
@ -460,6 +454,12 @@ config INTEL_RDT
Say N if unsure.
if X86_32
config X86_BIGSMP
bool "Support for big SMP systems with more than 8 CPUs"
depends on SMP
---help---
This option is needed for the systems that have more than 8 CPUs
config X86_EXTENDED_PLATFORM
bool "Support for extended (non-PC) x86 platforms"
default y
@ -949,17 +949,44 @@ config MAXSMP
Enable maximum number of CPUS and NUMA Nodes for this architecture.
If unsure, say N.
config RANGE_END_CPUS
int
depends on X86_32
default 8 if SMP && !X86_BIGSMP
default 64 if SMP && X86_BIGSMP
default 1 if !SMP
config RANGE_END_CPUS
int
depends on X86_64
default 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
default 8192 if SMP && (MAXSMP || CPUMASK_OFFSTACK)
default 1 if !SMP
config RANGE_BEGIN_CPUS
int
default 1 if !SMP
default RANGE_END_CPUS if MAXSMP
default 2
config DEF_CONFIG_CPUS
int
depends on X86_32
default 1 if !SMP
default 32 if X86_BIGSMP
default 8 if SMP
config DEF_CONFIG_CPUS
int
depends on X86_64
default 1 if !SMP
default 8192 if MAXSMP
default 64 if SMP
config NR_CPUS
int "Maximum number of CPUs" if SMP && !MAXSMP
range 2 8 if SMP && X86_32 && !X86_BIGSMP
range 2 64 if SMP && X86_32 && X86_BIGSMP
range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK && X86_64
range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
default "1" if !SMP
default "8192" if MAXSMP
default "32" if SMP && X86_BIGSMP
default "8" if SMP && X86_32
default "64" if SMP
range RANGE_BEGIN_CPUS RANGE_END_CPUS
default DEF_CONFIG_CPUS
---help---
This allows you to specify the maximum number of CPUs which this
kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum