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author | Jiri Olsa <jolsa@kernel.org> | 2015-09-07 10:38:03 +0200 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-09-15 09:48:32 -0300 |
commit | 01ca9fd41d6f2ad796a6b109b5253e06b6ae6dc7 (patch) | |
tree | 59da19c7f1b5d716a0442229e40af73844b09b89 | |
parent | 9bae1e8c3fe5359ce17309b894f54667fd563e98 (diff) | |
download | linux-stable-01ca9fd41d6f2ad796a6b109b5253e06b6ae6dc7.tar.gz linux-stable-01ca9fd41d6f2ad796a6b109b5253e06b6ae6dc7.tar.bz2 linux-stable-01ca9fd41d6f2ad796a6b109b5253e06b6ae6dc7.zip |
tools: Add err.h with ERR_PTR PTR_ERR interface
Adding part of the kernel's <linux/err.h> interface:
inline void * __must_check ERR_PTR(long error);
inline long __must_check PTR_ERR(__force const void *ptr);
inline bool __must_check IS_ERR(__force const void *ptr);
It will be used to propagate error through pointers in following
patches.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Raphael Beamonte <raphael.beamonte@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1441615087-13886-2-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r-- | tools/include/linux/err.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/tools/include/linux/err.h b/tools/include/linux/err.h new file mode 100644 index 000000000000..c9ada48f5156 --- /dev/null +++ b/tools/include/linux/err.h @@ -0,0 +1,49 @@ +#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/x86/x86_64/mm.txt 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); +} + +#endif /* _LINUX_ERR_H */ |