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kaf24@firebug.cl.cam.ac.uk
cdb8b09f6b
to simplify the porting. 64 bit version of Mini-os now compiles, but does not work because of the pagetables and some bits of scheduler not being written. Signed-off-by: Grzegorz Milos <gm281@cam.ac.uk>
32 lines
630 B
C
32 lines
630 B
C
#ifndef _ERR_H
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#define _ERR_H
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#include <errno.h>
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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 IS_ERR_VALUE(x) ((x) > (unsigned long)-1000L)
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static inline void *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 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 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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#endif /* _LINUX_ERR_H */
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