Commit 603c4ba9 authored Dec 14, 2009 by Phil Carmody Committed by Linus Torvalds Dec 15, 2009

err.h: add helper function to simplify pointer error checking



There are quite a few instances in the kernel of checks of pointers both
against NULL and against the errno range, handling both cases identically.
This additional helper function would simplify such code.

[akpm@linux-foundation.org: build fix]
Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 9385565e

include/linux/err.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -34,6 +34,11 @@ static inline long IS_ERR(const void *ptr)
		return IS_ERR_VALUE((unsigned long)ptr);
		}

		static inline long IS_ERR_OR_NULL(const void *ptr)
		{
		return !ptr \|\| IS_ERR_VALUE((unsigned long)ptr);
		}

		/**
		* ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
		* @ptr: The pointer to cast.