cregit-Linux how code gets into the kernel

Release 4.16 include/linux/kdev_t.h

Directory: include/linux
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_KDEV_T_H

#define _LINUX_KDEV_T_H

#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)	(((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 inline bool old_valid_dev(dev_t dev) { return MAJOR(dev) < 256 && MINOR(dev) < 256; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro2496.00%150.00%
Yaowei Bai14.00%150.00%
Total25100.00%2100.00%


static inline u16 old_encode_dev(dev_t dev) { return (MAJOR(dev) << 8) | MINOR(dev); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro25100.00%1100.00%
Total25100.00%1100.00%


static inline dev_t old_decode_dev(u16 val) { return MKDEV((val >> 8) & 255, val & 255); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro26100.00%1100.00%
Total26100.00%1100.00%


static inline u32 new_encode_dev(dev_t dev) { unsigned major = MAJOR(dev); unsigned minor = MINOR(dev); return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro50100.00%1100.00%
Total50100.00%1100.00%


static inline dev_t new_decode_dev(u32 dev) { unsigned major = (dev & 0xfff00) >> 8; unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); return MKDEV(major, minor); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro48100.00%1100.00%
Total48100.00%1100.00%


static inline u64 huge_encode_dev(dev_t dev) { return new_encode_dev(dev); }

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PersonTokensPropCommitsCommitProp
Al Viro16100.00%1100.00%
Total16100.00%1100.00%


static inline dev_t huge_decode_dev(u64 dev) { return new_decode_dev(dev); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro16100.00%1100.00%
Total16100.00%1100.00%


static inline int sysv_valid_dev(dev_t dev) { return MAJOR(dev) < (1<<14) && MINOR(dev) < (1<<18); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro33100.00%1100.00%
Total33100.00%1100.00%


static inline u32 sysv_encode_dev(dev_t dev) { return MINOR(dev) | (MAJOR(dev) << 18); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro25100.00%1100.00%
Total25100.00%1100.00%


static inline unsigned sysv_major(u32 dev) { return (dev >> 18) & 0x3fff; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro19100.00%1100.00%
Total19100.00%1100.00%


static inline unsigned sysv_minor(u32 dev) { return dev & 0x3ffff; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro15100.00%1100.00%
Total15100.00%1100.00%

#endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Al Viro29982.60%114.29%
Linus Torvalds308.29%114.29%
Andrew Morton205.52%114.29%
Linus Torvalds (pre-git)82.21%114.29%
David Howells30.83%114.29%
Greg Kroah-Hartman10.28%114.29%
Yaowei Bai10.28%114.29%
Total362100.00%7100.00%
Directory: include/linux
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