* x86: more than 8 32-bit CPUs requires X86_BIGSMP
@ 2009-04-22 1:44 Michael K. Johnson
2009-04-22 2:36 ` [tip:x86/urgent] " tip-bot for Michael K. Johnson
0 siblings, 1 reply; 2+ messages in thread
From: Michael K. Johnson @ 2009-04-22 1:44 UTC (permalink / raw)
To: linux-kernel
$ 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
^ permalink raw reply [flat|nested] 2+ messages in thread
* [tip:x86/urgent] x86: more than 8 32-bit CPUs requires X86_BIGSMP
2009-04-22 1:44 x86: more than 8 32-bit CPUs requires X86_BIGSMP Michael K. Johnson
@ 2009-04-22 2:36 ` tip-bot for Michael K. Johnson
0 siblings, 0 replies; 2+ messages in thread
From: tip-bot for Michael K. Johnson @ 2009-04-22 2:36 UTC (permalink / raw)
To: linux-tip-commits; +Cc: linux-kernel, hpa, mingo, johnsonm, tglx
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
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2009-04-22 2:37 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-04-22 1:44 x86: more than 8 32-bit CPUs requires X86_BIGSMP Michael K. Johnson
2009-04-22 2:36 ` [tip:x86/urgent] " tip-bot for Michael K. Johnson
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome