Messages in this thread Patch in this message | | | Date | Wed, 22 Apr 2009 02:36:45 GMT | From | "tip-bot for Michael K. Johnson" <> | Subject | [tip:x86/urgent] x86: more than 8 32-bit CPUs requires X86_BIGSMP |
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Commit-ID: 2a3313f494c2f3f74a27d66f0f14b38558b7dba2 Gitweb: http://git.kernel.org/tip/2a3313f494c2f3f74a27d66f0f14b38558b7dba2 Author: Michael K. Johnson <johnsonm@rpath.com> AuthorDate: Tue, 21 Apr 2009 21:44:48 -0400 Committer: H. Peter Anvin <hpa@zytor.com> CommitDate: Tue, 21 Apr 2009 19:34:54 -0700
x86: more than 8 32-bit CPUs requires X86_BIGSMP
$ 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>
--- arch/x86/Kconfig | 1 + 1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index c9086e6..b5cda6c 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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