auto
  "   ˆl–Ým_J*j"TâÁ9q–TÅ£Áƒh¹À¿      MAJOR=4
MINOR=44
DEVNAME=tty44
  *   ˆl–Ü4ý( ©³( 	Å€fàB¦-ÿÂƒÍ3_†I|¥+ÂÁ 3    /* 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 __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
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     	ˆÀÄƒO9¿ÃÂ 	¶    	/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Tracing hooks
 *
 * Copyright (C) 2008-2009 Red Hat, Inc.  All rights reserved.
 *
 * This file defines hook entry points called by core code where
 * user tracing/debugging support might need to do something.  These
 * entry points are called tracehook_*().  Each hook declared below
 * has a detailed kerneldoc comment giving the context (locking et
 * al) from which it is called, and the meaning of its return value.
 *
 * Each function here typically has only one call site, so it is ok
 * to have some nontrivial tracehook_*() inlines.  In all cases, the
 * fast path when no tracing is enabled should be very short.
 *
 * The purpose of this file and the tracehook_* layer is to consolidate
 * the interface that the kernel core and arch code uses to enable any
 * user debugging or tracing facility (such as ptrace).  The interfaces
 * here are carefully documented so that maintainers of core and arch
 * code do not need to think about the implementation details of the
 * tracing facilities.  Likewise, maintainers of the tracing code do not
 * need to understand all the calling core or arch code in detail, just
 * documented circumstances of each call, such as locking conditions.
 *
 * If the calling core code changes so that locking is different, then
 * it is ok to change the interface documented here.  The maintainer of
 * core code changing should notify the maintainers of the tracing code
 * that they need to work out the change.
 *
 * Some tracehook_*() inlines take arguments that the current tracing
 * implementations might not necessarily use.  These function signatures
 * are chosen to pass in all the information that is on hand in the
 * caller and might conceivably be relevant to a tracer, so that the
 * core code won't have to be updated when tracing adds more features.
 * If a call site changes so that some of those parameters are no longer
 * already on hand without extra work, then the tracehook_* interface
 * can change so