[PATCH 1/3] err.h: add ERR_PTR_CONST macro

[Christian Marangi <ansuelsmth@gmail.com>]

Add ERR_PTR_CONST macro to initialize global variables with error
pointers. This might be useful for specific case where there is a global
variables initialized to an error condition and then later set to the
real handle once probe finish/completes.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 include/linux/err.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/err.h b/include/linux/err.h
index 1d60aa86db53..a38071881b20 100644
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -41,6 +41,14 @@ static inline void * __must_check ERR_PTR(long error)
 	return (void *) error;
 }
 
+/**
+ * ERR_PTR_CONST - define a const error pointer.
+ * @error: A negative error code.
+ *
+ * Like ERR_PTR(), but usable to initialize global variables.
+ */
+#define ERR_PTR_CONST(error) ((void *)(error))
+
 /* Return the pointer in the percpu address space. */
 #define ERR_PTR_PCPU(error) ((void __percpu *)(unsigned long)ERR_PTR(error))
 
-- 
2.51.0