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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <uapi/linux/kdev_t.h>
#define MINORBITS 20#define MINORMASK ((1U << MINORBITS) - 1)
#define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS))#define MINOR(dev) ((unsigned int) ((dev) & MINORMASK))#define MKDEV(ma, mi) (((dev_t)(ma) << MINORBITS) | (mi))
#define print_dev_t(buffer, dev) \ sprintf((buffer), "%u:%u\n", MAJOR(dev), MINOR(dev))
#define format_dev_t(buffer, dev) \ ({ \ sprintf(buffer, "%u:%u", MAJOR(dev), MINOR(dev)); \ buffer; \ })
/* acceptable for old filesystems */static __always_inline bool old_valid_dev(dev_t dev){ return MAJOR(dev) < 256 && MINOR(dev) < 256;}
static __always_inline u16 old_encode_dev(dev_t dev){ return (MAJOR(dev) << 8) | MINOR(dev);}
static __always_inline dev_t old_decode_dev(u16 val){ return MKDEV((val >> 8) & 255, val & 255);}
static __always_inline u32 new_encode_dev(dev_t dev){ unsigned major = MAJOR(dev); unsigned minor = MINOR(dev); return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);}
static __always_inline dev_t new_decode_dev(u32 dev){ unsigned major = (dev & 0xfff00) >> 8; unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); return MKDEV(major, minor);}
static __always_inline u64 huge_encode_dev(dev_t dev){ return new_encode_dev(dev);}
static __always_inline dev_t huge_decode_dev(u64 dev){ return new_decode_dev(dev);}
static __always_inline int sysv_valid_dev(dev_t dev){ return MAJOR(dev) < (1<<14) && MINOR(dev) < (1<<18);}
static __always_inline u32 sysv_encode_dev(dev_t dev){ return MINOR(dev) | (MAJOR(dev) << 18);}
static __always_inline unsigned sysv_major(u32 dev){ return (dev >> 18) & 0x3fff;}
static __always_inline unsigned sysv_minor(u32 dev){ return dev & 0x3ffff;}
#endif