Linux 4.13.16
[linux/fpc-iii.git] / arch / powerpc / include / asm / cpu_has_feature.h
blob0d1df02bf99d3e4257bac057d6921318a80d10b2
1 #ifndef __ASM_POWERPC_CPU_HAS_FEATURE_H
2 #define __ASM_POWERPC_CPU_HAS_FEATURE_H
4 #ifndef __ASSEMBLY__
6 #include <linux/bug.h>
7 #include <asm/cputable.h>
9 static inline bool early_cpu_has_feature(unsigned long feature)
11 return !!((CPU_FTRS_ALWAYS & feature) ||
12 (CPU_FTRS_POSSIBLE & cur_cpu_spec->cpu_features & feature));
15 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
16 #include <linux/jump_label.h>
18 #define NUM_CPU_FTR_KEYS BITS_PER_LONG
20 extern struct static_key_true cpu_feature_keys[NUM_CPU_FTR_KEYS];
22 static __always_inline bool cpu_has_feature(unsigned long feature)
24 int i;
26 #ifndef __clang__ /* clang can't cope with this */
27 BUILD_BUG_ON(!__builtin_constant_p(feature));
28 #endif
30 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
31 if (!static_key_initialized) {
32 printk("Warning! cpu_has_feature() used prior to jump label init!\n");
33 dump_stack();
34 return early_cpu_has_feature(feature);
36 #endif
38 if (CPU_FTRS_ALWAYS & feature)
39 return true;
41 if (!(CPU_FTRS_POSSIBLE & feature))
42 return false;
44 i = __builtin_ctzl(feature);
45 return static_branch_likely(&cpu_feature_keys[i]);
47 #else
48 static inline bool cpu_has_feature(unsigned long feature)
50 return early_cpu_has_feature(feature);
52 #endif
54 #endif /* __ASSEMBLY__ */
55 #endif /* __ASM_POWERPC_CPU_HAS_FEATURE_H */