cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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err.h (1527B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_ERR_H
      3#define _LINUX_ERR_H
      4
      5#include <linux/compiler.h>
      6#include <linux/types.h>
      7
      8#include <asm/errno.h>
      9
     10/*
     11 * Kernel pointers have redundant information, so we can use a
     12 * scheme where we can return either an error code or a normal
     13 * pointer with the same return value.
     14 *
     15 * This should be a per-architecture thing, to allow different
     16 * error and pointer decisions.
     17 */
     18#define MAX_ERRNO	4095
     19
     20#ifndef __ASSEMBLY__
     21
     22#define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO)
     23
     24static inline void * __must_check ERR_PTR(long error)
     25{
     26	return (void *) error;
     27}
     28
     29static inline long __must_check PTR_ERR(__force const void *ptr)
     30{
     31	return (long) ptr;
     32}
     33
     34static inline bool __must_check IS_ERR(__force const void *ptr)
     35{
     36	return IS_ERR_VALUE((unsigned long)ptr);
     37}
     38
     39static inline bool __must_check IS_ERR_OR_NULL(__force const void *ptr)
     40{
     41	return unlikely(!ptr) || IS_ERR_VALUE((unsigned long)ptr);
     42}
     43
     44/**
     45 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
     46 * @ptr: The pointer to cast.
     47 *
     48 * Explicitly cast an error-valued pointer to another pointer type in such a
     49 * way as to make it clear that's what's going on.
     50 */
     51static inline void * __must_check ERR_CAST(__force const void *ptr)
     52{
     53	/* cast away the const */
     54	return (void *) ptr;
     55}
     56
     57static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
     58{
     59	if (IS_ERR(ptr))
     60		return PTR_ERR(ptr);
     61	else
     62		return 0;
     63}
     64
     65#endif
     66
     67#endif /* _LINUX_ERR_H */