diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2008-10-13 17:15:23 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-10-18 10:49:13 -0700 |
| commit | f558a0f3f28dcdb969d56ce9bad1391d001c3b31 (patch) | |
| tree | 17dde2501fbb91709d243ee8d86f15dfc9c8782a | |
| parent | e87898fdba90f9a270ae6bdb8ce98da91338a951 (diff) | |
x86: improve UP kernel when CPU-hotplug and SMP is enabled
commit 649c6653fa94ec8f3ea32b19c97b790ec4e8e4ac upstream
num_possible_cpus() can be > 1 when disabled CPUs have been accounted.
Disabled CPUs are not in the cpu_present_map, so we can use
num_present_cpus() as a safe indicator to switch to UP alternatives.
Reported-by: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/x86/kernel/alternative.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 65a0c1b48696..f509cfc6bf63 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -444,7 +444,7 @@ void __init alternative_instructions(void) _text, _etext); /* Only switch to UP mode if we don't immediately boot others */ - if (num_possible_cpus() == 1 || setup_max_cpus <= 1) + if (num_present_cpus() == 1 || setup_max_cpus <= 1) alternatives_smp_switch(0); } #endif |