write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/arch/x86/include/asm/cpumask.h
..
..
@@ -11,5 +11,23 @@
11
11
 
12
12
 extern void setup_cpu_local_masks(void);
13
13
 
14
+/*
15
+ * NMI and MCE exceptions need cpu_is_offline() _really_ early,
16
+ * provide an arch_ special for them to avoid instrumentation.
17
+ */
18
+#if NR_CPUS > 1
19
+static __always_inline bool arch_cpu_online(int cpu)
20
+{
21
+	return arch_test_bit(cpu, cpumask_bits(cpu_online_mask));
22
+}
23
+#else
24
+static __always_inline bool arch_cpu_online(int cpu)
25
+{
26
+	return cpu == 0;
27
+}
28
+#endif
29
+
30
+#define arch_cpu_is_offline(cpu)	unlikely(!arch_cpu_online(cpu))
31
+
14
32
 #endif /* __ASSEMBLY__ */
15
33
 #endif /* _ASM_X86_CPUMASK_H */