[failures] container_ofh-make-container_of-const-aware.patch removed from -mm tree

[failures] container_ofh-make-container_of-const-aware.patch removed from -mm tree

[Andrew Morton]

The patch titled
     Subject: container_of.h: make container_of const-aware
has been removed from the -mm tree.  Its filename was
     container_ofh-make-container_of-const-aware.patch

This patch was dropped because it had testing failures

------------------------------------------------------
From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Subject: container_of.h: make container_of const-aware

container_of() macro has one major drawback.  It does not check whether
the passed ptr has a const pointer, the result will always be a non-const
pointer.  Use a _Generic() construct (supported since gcc 4.9 and Clang
3.0) to teach container_of that if converting a const pointer, the
returned pointer should also have the const modifier.

Link: https://lkml.kernel.org/r/20220210170434.3924169-1-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/include/linux/container_of.h~container_ofh-make-container_of-const-aware
+++ a/include/linux/container_of.h
@@ -19,7 +19,11 @@
 	static_assert(__same_type(*(ptr), ((type *)0)->member) ||	\
 		      __same_type(*(ptr), void),			\
 		      "pointer type mismatch in container_of()");	\
-	((type *)(__mptr - offsetof(type, member))); })
+	_Generic((ptr),							\
+		const typeof(((type *)0)->member)*:			\
+			((const type *)(__mptr - offsetof(type, member))), \
+		default: ((type *)(__mptr - offsetof(type, member)))	\
+	); })
 
 /**
  * container_of_safe - cast a member of a structure out to the containing structure
@@ -35,6 +39,10 @@
 		      __same_type(*(ptr), void),			\
 		      "pointer type mismatch in container_of_safe()");	\
 	IS_ERR_OR_NULL(__mptr) ? ERR_CAST(__mptr) :			\
-		((type *)(__mptr - offsetof(type, member))); })
+	_Generic((ptr),							\
+		const typeof(((type *)0)->member)*:			\
+			((const type *)(__mptr - offsetof(type, member))), \
+		default: ((type *)(__mptr - offsetof(type, member)))	\
+	); })
 
 #endif	/* _LINUX_CONTAINER_OF_H */
_

Patches currently in -mm which might be from dmitry.baryshkov@linaro.org are