1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_CPUMASK_H
3 #define _ASM_X86_CPUMASK_H
4 #ifndef __ASSEMBLY__
5 #include <linux/cpumask.h>
6
7 extern void setup_cpu_local_masks(void);
8
9 /*
10 * NMI and MCE exceptions need cpu_is_offline() _really_ early,
11 * provide an arch_ special for them to avoid instrumentation.
12 */
13 #if NR_CPUS > 1
14 static __always_inline bool arch_cpu_online(int cpu)
15 {
16 return arch_test_bit(cpu, cpumask_bits(cpu_online_mask));
17 }
18
19 static __always_inline void arch_cpumask_clear_cpu(int cpu, struct cpumask *dstp)
20 {
21 arch_clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
22 }
23 #else
24 static __always_inline bool arch_cpu_online(int cpu)
25 {
26 return cpu == 0;
27 }
28
29 static __always_inline void arch_cpumask_clear_cpu(int cpu, struct cpumask *dstp)
30 {
31 return;
32 }
33 #endif
34
35 #define arch_cpu_is_offline(cpu) unlikely(!arch_cpu_online(cpu))
36
37 #endif /* __ASSEMBLY__ */
38 #endif /* _ASM_X86_CPUMASK_H */
39
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