name : cpu_has_feature.h /* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_POWERPC_CPU_HAS_FEATURE_H #define __ASM_POWERPC_CPU_HAS_FEATURE_H #ifndef __ASSEMBLY__ #include <linux/bug.h> #include <asm/cputable.h> static __always_inline bool early_cpu_has_feature(unsigned long feature) { return !!((CPU_FTRS_ALWAYS & feature) || (CPU_FTRS_POSSIBLE & cur_cpu_spec->cpu_features & feature)); } #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS #include <linux/jump_label.h> #define NUM_CPU_FTR_KEYS BITS_PER_LONG extern struct static_key_true cpu_feature_keys[NUM_CPU_FTR_KEYS]; static __always_inline bool cpu_has_feature(unsigned long feature) { int i; #ifndef __clang__ /* clang can't cope with this */ BUILD_BUG_ON(!__builtin_constant_p(feature)); #endif #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG if (!static_key_initialized) { printk("Warning! cpu_has_feature() used prior to jump label init!\n"); dump_stack(); return early_cpu_has_feature(feature); } #endif if (CPU_FTRS_ALWAYS & feature) return true; if (!(CPU_FTRS_POSSIBLE & feature)) return false; i = __builtin_ctzl(feature); return static_branch_likely(&cpu_feature_keys[i]); } #else static __always_inline bool cpu_has_feature(unsigned long feature) { return early_cpu_has_feature(feature); } #endif #endif /* __ASSEMBLY__ */ #endif /* __ASM_POWERPC_CPU_HAS_FEATURE_H */