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authorThomas Gleixner <tglx@linutronix.de>2008-10-13 17:15:23 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-22 14:05:12 -0700
commit75402d996fe1fe834ce1d1ed5d600407b23a8713 (patch)
treece1ca1e8e5930cc95fd5cbfdbab092c535f13636
parent3be261e3f5e2ee64f36d40f1b06d345e1dd62012 (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.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 5fed98ca0e1f..2fb2dfeeee22 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -457,7 +457,7 @@ 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