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01ab2e9110
Add PTR_ERR_OR_ZERO, so that tools can use it, just like the kernel. Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1536284082-23466-1-git-send-email-dingxiang@cmss.chinamobile.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __TOOLS_LINUX_ERR_H
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#define __TOOLS_LINUX_ERR_H
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <asm/errno.h>
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/*
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* Original kernel header comment:
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*
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* Kernel pointers have redundant information, so we can use a
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* scheme where we can return either an error code or a normal
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* pointer with the same return value.
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*
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* This should be a per-architecture thing, to allow different
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* error and pointer decisions.
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*
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* Userspace note:
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* The same principle works for userspace, because 'error' pointers
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* fall down to the unused hole far from user space, as described
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* in Documentation/x86/x86_64/mm.txt for x86_64 arch:
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*
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* 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm hole caused by [48:63] sign extension
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* ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
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*
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* It should be the same case for other architectures, because
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* this code is used in generic kernel code.
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*/
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#define MAX_ERRNO 4095
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#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
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static inline void * __must_check ERR_PTR(long error_)
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{
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return (void *) error_;
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}
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static inline long __must_check PTR_ERR(__force const void *ptr)
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{
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return (long) ptr;
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}
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static inline bool __must_check IS_ERR(__force const void *ptr)
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{
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return IS_ERR_VALUE((unsigned long)ptr);
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}
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static inline bool __must_check IS_ERR_OR_NULL(__force const void *ptr)
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{
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return unlikely(!ptr) || IS_ERR_VALUE((unsigned long)ptr);
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}
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static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
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{
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if (IS_ERR(ptr))
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return PTR_ERR(ptr);
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else
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return 0;
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}
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#endif /* _LINUX_ERR_H */
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