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authorThomas Gleixner <tglx@linutronix.de>2008-10-05 10:52:24 -0400
committerIngo Molnar <mingo@elte.hu>2008-10-13 04:33:46 -0400
commit649c6653fa94ec8f3ea32b19c97b790ec4e8e4ac (patch)
treea6c3c0f48147ebcd9eca8d5e0e188f36477705e9 /arch/x86
parent8a541665b9063c5006b370d4488cf9f6beb6083f (diff)
x86: improve UP kernel when CPU-hotplug and SMP is enabled
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> Cc: <stable@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
-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 fb04e49776ba..a84ac7b570e6 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -444,7 +444,7 @@ void __init alternative_instructions(void)
444 _text, _etext); 444 _text, _etext);
445 445
446 /* Only switch to UP mode if we don't immediately boot others */ 446 /* Only switch to UP mode if we don't immediately boot others */
447 if (num_possible_cpus() == 1 || setup_max_cpus <= 1) 447 if (num_present_cpus() == 1 || setup_max_cpus <= 1)
448 alternatives_smp_switch(0); 448 alternatives_smp_switch(0);
449 } 449 }
450#endif 450#endif