Eric Lee / smarc-ti-linux-kernel

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Commit bb61ccc7dbcbc1ed4600bef5610d99ec91fd7032

Authored by Josh Boyer
Committed by Ingo Molnar
1 parent a477c8594b
Exists in master and in 16 other branches dlt-processor-sdk-linux-03.00.00.04, processor-sdk-linux-01.00.00, processor-sdk-linux-02.00.01, smarc-ti-linux-3.14.y, smarc-ti-linux-3.15.y, smarc-ti-lsk-linux-4.1.y, smarct3x-processor-sdk-04.01.00.06, smarct3x-processor-sdk-linux-02.00.01, smarct3x-processor-sdk-linux-03.00.00.04, smarct4x-800-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-04.01.00.06, smarct4x-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-linux-03.00.00.04, ti-linux-3.14.y, ti-linux-3.15.y, ti-lsk-linux-4.1.y

x86/cpu: Allow higher NR_CPUS values 

The current range for SMP configs is 2 - 512 CPUs, or a full
4096 in the case of MAXSMP.  There are machines that have 1024
CPUs in them today and configuring a kernel for that means you
are forced to set MAXSMP.  This adds additional unnecessary
overhead.  While that overhead might be considered tiny for
large machines, it isn't necessarily so if you are building a
kernel that runs across a wide variety of machines.

To cover the range of more common machines today, we allow
NR_CPUS to be up to 4096 when CPUMASK_OFFSTACK is enabled.

Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org>
Cc: prarit@redhat.com
Cc: Russ Anderson <rja@sgi.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20131105143728.GJ9944@hansolo.jdub.homelinux.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

Showing 1 changed file with 4 additions and 2 deletions Side-by-side Diff

... ... @@ -825,14 +825,16 @@
825 825 config NR_CPUS
826 826 int "Maximum number of CPUs" if SMP && !MAXSMP
827 827 range 2 8 if SMP && X86_32 && !X86_BIGSMP
828   - range 2 512 if SMP && !MAXSMP
  828 + range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
  829 + range 2 4096 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
829 830 default "1" if !SMP
830 831 default "4096" if MAXSMP
831 832 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
832 833 default "8" if SMP
833 834 ---help---
834 835 This allows you to specify the maximum number of CPUs which this
835   - kernel will support. The maximum supported value is 512 and the
  836 + kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
  837 + supported value is 4096, otherwise the maximum value is 512. The
836 838 minimum value which makes sense is 2.
837 839  
838 840 This is purely to save memory - each supported CPU adds