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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>
LKML-Reference: <20090422014448.GB32541@logo.rdu.rpath.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Michael K. Johnson 2009-04-21 21:44:48 -04:00 • committed by H. Peter Anvin
commit 2a3313f494
1 changed files with 1 additions and 0 deletions
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arch/x86/Kconfig
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@ -664,6 +664,7 @@ config MAXSMP
config NR_CPUS config NR_CPUS
int "Maximum number of CPUs" if SMP && !MAXSMP int "Maximum number of CPUs" if SMP && !MAXSMP
range 2 8 if SMP && X86_32 && !X86_BIGSMP
range 2 512 if SMP && !MAXSMP range 2 512 if SMP && !MAXSMP
default "1" if !SMP default "1" if !SMP
default "4096" if MAXSMP default "4096" if MAXSMP