X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Ferr.h;h=ec87f3142bf30940c31911e71e6638d749de8f04;hb=13c48c490208d9e70d8d66d56f96c5054db69af7;hp=cd3b367f7445e5aa0f25ddbf2f0b96c44a19b94f;hpb=0d1782144e81faf6203075c5fcd0a2f0db91af5b;p=linux-2.6

diff --git a/include/linux/err.h b/include/linux/err.h
index cd3b367f74..ec87f3142b 100644
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -15,6 +15,8 @@
  */
 #define MAX_ERRNO	4095
 
+#ifndef __ASSEMBLY__
+
 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
 
 static inline void *ERR_PTR(long error)
@@ -32,4 +34,19 @@ static inline long IS_ERR(const void *ptr)
 	return IS_ERR_VALUE((unsigned long)ptr);
 }
 
+/**
+ * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
+ * @ptr: The pointer to cast.
+ *
+ * Explicitly cast an error-valued pointer to another pointer type in such a
+ * way as to make it clear that's what's going on.
+ */
+static inline void *ERR_CAST(const void *ptr)
+{
+	/* cast away the const */
+	return (void *) ptr;
+}
+
+#endif
+
 #endif /* _LINUX_ERR_H */