diff options
Diffstat (limited to 'arch/x86/kernel/smp.c')
| -rw-r--r-- | arch/x86/kernel/smp.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c index 65dd44e3fc1c..1bb79526c217 100644 --- a/arch/x86/kernel/smp.c +++ b/arch/x86/kernel/smp.c @@ -148,15 +148,16 @@ static int register_stop_handler(void) static void native_stop_other_cpus(int wait) { - unsigned int this_cpu; + unsigned int old_cpu, this_cpu; unsigned long flags, timeout; if (reboot_force) return; /* Only proceed if this is the first CPU to reach this code */ + old_cpu = -1; this_cpu = smp_processor_id(); - if (atomic_cmpxchg(&stopping_cpu, -1, this_cpu) != -1) + if (!atomic_try_cmpxchg(&stopping_cpu, &old_cpu, this_cpu)) return; /* For kexec, ensure that offline CPUs are out of MWAIT and in HLT */ |