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3243 Serge 1 
#ifndef _LINUX_ERR_H
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#define _LINUX_ERR_H
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#include
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#include
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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 dentry
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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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#define MAX_ERRNO	4095
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#ifndef __ASSEMBLY__
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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(const void *ptr)
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{
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	return (long) ptr;
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}
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static inline long __must_check IS_ERR(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 long __must_check IS_ERR_OR_NULL(const void *ptr)
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{
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	return !ptr || IS_ERR_VALUE((unsigned long)ptr);
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}
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/**
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 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
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 * @ptr: The pointer to cast.
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 *
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 * Explicitly cast an error-valued pointer to another pointer type in such a
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 * way as to make it clear that's what's going on.
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 */
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static inline void * __must_check ERR_CAST(const void *ptr)
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{
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	/* cast away the const */
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	return (void *) ptr;
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}
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static inline int __must_check PTR_RET(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
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#endif /* _LINUX_ERR_H */