Commit 603c4ba9 authored by Phil Carmody's avatar Phil Carmody Committed by Linus Torvalds

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: default avatarPhil Carmody <ext-phil.2.carmody@nokia.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9385565e
...@@ -34,6 +34,11 @@ static inline long IS_ERR(const void *ptr) ...@@ -34,6 +34,11 @@ static inline long IS_ERR(const void *ptr)
return IS_ERR_VALUE((unsigned long)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 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
* @ptr: The pointer to cast. * @ptr: The pointer to cast.
......
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