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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __TOOLS_LINUX_ERR_H
#define __TOOLS_LINUX_ERR_H
#include <linux/compiler.h>
#include <linux/types.h>
#include <asm/errno.h>
/*
* Original kernel header comment:
*
* 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.
*
* Userspace note:
* The same principle works for userspace, because 'error' pointers
* fall down to the unused hole far from user space, as described
* in Documentation/arch/x86/x86_64/mm.rst for x86_64 arch:
*
* 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm hole caused by [48:63] sign extension
* ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
*
* It should be the same case for other architectures, because
* this code is used in generic kernel code.
*/
#define MAX_ERRNO 4095
#define IS_ERR_VALUE(x) unlikely((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);
}
static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
{
if (IS_ERR(ptr))
return PTR_ERR(ptr);
else
return 0;
}
/**
* 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;
}
#endif /* _LINUX_ERR_H */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| sched | Folder | 0755 |
|
|
| unaligned | Folder | 0755 |
|
|
| align.h | File | 339 B | 0644 |
|
| arm-smccc.h | File | 5.63 KB | 0644 |
|
| atomic.h | File | 363 B | 0644 |
|
| bitfield.h | File | 5.33 KB | 0644 |
|
| bitmap.h | File | 4.82 KB | 0644 |
|
| bitops.h | File | 2.15 KB | 0644 |
|
| bits.h | File | 1.17 KB | 0644 |
|
| btf_ids.h | File | 5.97 KB | 0644 |
|
| bug.h | File | 442 B | 0644 |
|
| build_bug.h | File | 3.04 KB | 0644 |
|
| compiler-gcc.h | File | 1.24 KB | 0644 |
|
| compiler.h | File | 5.82 KB | 0644 |
|
| compiler_types.h | File | 1.09 KB | 0644 |
|
| const.h | File | 421 B | 0644 |
|
| coresight-pmu.h | File | 2.32 KB | 0644 |
|
| ctype.h | File | 1.9 KB | 0644 |
|
| debug_locks.h | File | 288 B | 0644 |
|
| delay.h | File | 117 B | 0644 |
|
| err.h | File | 1.99 KB | 0644 |
|
| export.h | File | 129 B | 0644 |
|
| filter.h | File | 9.59 KB | 0644 |
|
| find.h | File | 5.77 KB | 0644 |
|
| ftrace.h | File | 120 B | 0644 |
|
| gfp.h | File | 322 B | 0644 |
|
| gfp_types.h | File | 46 B | 0644 |
|
| hardirq.h | File | 280 B | 0644 |
|
| hash.h | File | 2.93 KB | 0644 |
|
| hashtable.h | File | 4.44 KB | 0644 |
|
| interrupt.h | File | 129 B | 0644 |
|
| interval_tree_generic.h | File | 6.7 KB | 0644 |
|
| irqflags.h | File | 1.37 KB | 0644 |
|
| jhash.h | File | 4.46 KB | 0644 |
|
| kallsyms.h | File | 646 B | 0644 |
|
| kconfig.h | File | 2.39 KB | 0644 |
|
| kern_levels.h | File | 954 B | 0644 |
|
| kernel.h | File | 2.64 KB | 0644 |
|
| linkage.h | File | 123 B | 0644 |
|
| list.h | File | 22.48 KB | 0644 |
|
| list_sort.h | File | 374 B | 0644 |
|
| lockdep.h | File | 1.43 KB | 0644 |
|
| log2.h | File | 4.46 KB | 0644 |
|
| math.h | File | 764 B | 0644 |
|
| math64.h | File | 1.22 KB | 0644 |
|
| module.h | File | 270 B | 0644 |
|
| mutex.h | File | 117 B | 0644 |
|
| nmi.h | File | 0 B | 0644 |
|
| numa.h | File | 292 B | 0644 |
|
| objtool_types.h | File | 1.8 KB | 0644 |
|
| overflow.h | File | 4.11 KB | 0644 |
|
| poison.h | File | 2.5 KB | 0644 |
|
| proc_fs.h | File | 123 B | 0644 |
|
| rbtree.h | File | 9.32 KB | 0644 |
|
| rbtree_augmented.h | File | 9.34 KB | 0644 |
|
| rcu.h | File | 437 B | 0644 |
|
| refcount.h | File | 4.11 KB | 0644 |
|
| ring_buffer.h | File | 2.4 KB | 0644 |
|
| rwsem.h | File | 920 B | 0644 |
|
| seq_file.h | File | 126 B | 0644 |
|
| sizes.h | File | 1.12 KB | 0644 |
|
| slab.h | File | 1.17 KB | 0644 |
|
| spinlock.h | File | 1.24 KB | 0644 |
|
| stacktrace.h | File | 678 B | 0644 |
|
| static_call_types.h | File | 2.74 KB | 0644 |
|
| string.h | File | 1.4 KB | 0644 |
|
| stringify.h | File | 380 B | 0644 |
|
| time64.h | File | 347 B | 0644 |
|
| types.h | File | 1.72 KB | 0644 |
|
| zalloc.h | File | 252 B | 0644 |
|