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.goldschm...@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
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