/* * Macros imported from <asm/cpufeature.h>: * - cpu_feature(x) ordinal value of feature called 'x' * - cpu_have_feature(u32 n) whether feature #n is available * - MAX_CPU_FEATURES upper bound for feature ordinal values * Optional: * - CPU_FEATURE_TYPEFMT format string fragment for printing the cpu type * - CPU_FEATURE_TYPEVAL set of values matching the format string above
*/
/* * Use module_cpu_feature_match(feature, module_init_function) to * declare that * a) the module shall be probed upon discovery of CPU feature 'feature' * (typically at boot time using udev) * b) the module must not be loaded if CPU feature 'feature' is not present * (not even by manual insmod). * * For a list of legal values for 'feature', please consult the file * 'asm/cpufeature.h' of your favorite architecture.
*/ #define module_cpu_feature_match(x, __initfunc) \ staticstruct cpu_feature const __maybe_unused cpu_feature_match_ ## x[] = \
{ { .feature = cpu_feature(x) }, { } }; \
MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x); \
\ staticint __init cpu_feature_match_ ## x ## _init(void) \
{ \ if (!cpu_have_feature(cpu_feature(x))) \ return -ENODEV; \ return __initfunc(); \
} \
module_init(cpu_feature_match_ ## x ## _init)
#endif #endif
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