Commit d1bc8e95 authored Feb 07, 2008 by David Howells Committed by Linus Torvalds Feb 07, 2008

Add an ERR_CAST() function to complement ERR_PTR and co.

Add an ERR_CAST() function to complement ERR_PTR and co. for the purposes
of casting an error entyped as one pointer type to an error of another
pointer type whilst making it explicit as to what is going on.

This provides a replacement for the ERR_PTR(PTR_ERR(p)) construct.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent ae5e2979

include/linux/err.h

+13 −0

Original line number	Diff line number	Diff line
		@@ -34,6 +34,19 @@ static inline long IS_ERR(const void *ptr)
		return IS_ERR_VALUE((unsigned long)ptr);
		}

		/**
		* ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
		* @ptr: The pointer to cast.
		*
		* Explicitly cast an error-valued pointer to another pointer type in such a
		* way as to make it clear that's what's going on.
		*/
		static inline void ERR_CAST(const void ptr)
		{
		/* cast away the const */
		return (void *) ptr;
		}

		#endif

		#endif /* _LINUX_ERR_H */