Messages in this thread Patch in this message | | | Date | Tue, 21 Apr 2009 21:44:48 -0400 | From | "Michael K. Johnson" <> | Subject | x86: more than 8 32-bit CPUs requires X86_BIGSMP |
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$ cat x86-more-than-8-cpus-requires-bigsmp.patch
Enforce NR_CPUS <= 8 limitation if X86_BIGSMP not set
Configuring more than 8 logical CPUs on 32-bit x86 requires X86_BIGSMP to be set in order to boot successfully, if more than 8 logical CPUs are actually found at boot time. The X86_BIGSMP help text describes that it is required to be set if more than 8 CPUs are configured, but this was previously not enforced.
This configuration error has affected multiple distributions: https://bugzilla.redhat.com/show_bug.cgi?id=480844 https://issues.rpath.com/browse/RPL-3022
Signed-off-by: Michael K Johnson <johnsonm@rpath.com>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index c9086e6..cdad0d9 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -664,6 +664,7 @@ config MAXSMP config NR_CPUS int "Maximum number of CPUs" if SMP && !MAXSMP + range 2 8 if SMP && X86_32 && !X86_BIGSMP range 2 512 if SMP && !MAXSMP default "1" if !SMP default "4096" if MAXSMP
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