Contributors: 14
Author Tokens Token Proportion Commits Commit Proportion
Dave Jones 66 34.38% 1 6.67%
Uwe Kleine-König 29 15.10% 1 6.67%
Phil Carmody 24 12.50% 1 6.67%
David Howells 22 11.46% 1 6.67%
Rusty Russell 9 4.69% 1 6.67%
Linus Torvalds 8 4.17% 2 13.33%
Joe Perches 6 3.12% 1 6.67%
Jani Nikula 5 2.60% 1 6.67%
Dan Carpenter 5 2.60% 1 6.67%
Andrew Morton 5 2.60% 1 6.67%
Randy Dunlap 5 2.60% 1 6.67%
Ralf Baechle 4 2.08% 1 6.67%
Viresh Kumar 3 1.56% 1 6.67%
Greg Kroah-Hartman 1 0.52% 1 6.67%
Total 192 15 


/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_ERR_H
#define _LINUX_ERR_H

#include <linux/compiler.h>
#include <linux/types.h>

#include <asm/errno.h>

/*
 * Kernel pointers have redundant information, so we can use a
 * scheme where we can return either an error code or a normal
 * pointer with the same return value.
 *
 * This should be a per-architecture thing, to allow different
 * error and pointer decisions.
 */
#define MAX_ERRNO	4095

#ifndef __ASSEMBLY__

#define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO)

static inline void * __must_check ERR_PTR(long error)
{
	return (void *) error;
}

static inline long __must_check PTR_ERR(__force const void *ptr)
{
	return (long) ptr;
}

static inline bool __must_check IS_ERR(__force const void *ptr)
{
	return IS_ERR_VALUE((unsigned long)ptr);
}

static inline bool __must_check IS_ERR_OR_NULL(__force const void *ptr)
{
	return unlikely(!ptr) || IS_ERR_VALUE((unsigned long)ptr);
}

/**
 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
 * @ptr: The pointer to cast.
 *
 * Explicitly cast an error-valued pointer to another pointer type in such a
 * way as to make it clear that's what's going on.
 */
static inline void * __must_check ERR_CAST(__force const void *ptr)
{
	/* cast away the const */
	return (void *) ptr;
}

static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
{
	if (IS_ERR(ptr))
		return PTR_ERR(ptr);
	else
		return 0;
}

/* Deprecated */
#define PTR_RET(p) PTR_ERR_OR_ZERO(p)

#endif

#endif /* _LINUX_ERR_H */