lkml.org 
[lkml]   [2009]   [Apr]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/urgent] x86: more than 8 32-bit CPUs requires X86_BIGSMP
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

\
 
 \ /
  Last update: 2009-04-22 04:41    [W:0.868 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site