[U-Boot] [PATCH 2/3] linux err: make ERR_PTR/PTR_ERR architecture specific

[Simon Goldschmidt]

This patch changes ERR_PTR/PTR_ERR to use CONFIG_ERR_PTR_OFFSET to map
errno values into a pointer region that cannot contain valid pointers.

IS_ERR and IS_ERR_OR_NULL have to be converted to use PTR_ERR, too,
for this to work.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
---

 include/linux/err.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/err.h b/include/linux/err.h
index 22e5756edd..5ede82432d 100644
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -23,22 +23,22 @@
 
 static inline void *ERR_PTR(long error)
 {
-	return (void *) error;
+	return (void *)(CONFIG_ERR_PTR_OFFSET + error);
 }
 
 static inline long PTR_ERR(const void *ptr)
 {
-	return (long) ptr;
+	return ((long)ptr - CONFIG_ERR_PTR_OFFSET);
 }
 
 static inline long IS_ERR(const void *ptr)
 {
-	return IS_ERR_VALUE((unsigned long)ptr);
+	return IS_ERR_VALUE((unsigned long)PTR_ERR(ptr));
 }
 
 static inline bool IS_ERR_OR_NULL(const void *ptr)
 {
-	return !ptr || IS_ERR_VALUE((unsigned long)ptr);
+	return !ptr || IS_ERR_VALUE((unsigned long)PTR_ERR(ptr));
 }
 
 /**
-- 
2.20.1