1 files changed, 0 insertions, 110 deletions
diff --git a/drivers/staging/erofs/include/linux/tagptr.h b/drivers/staging/erofs/include/linux/tagptr.h
deleted file mode 100644
index ccd106dbd48e..000000000000
--- a/drivers/staging/erofs/include/linux/tagptr.h
+++ /dev/null
@@ -1,110 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0
- *
- * Tagged pointer implementation
- *
- * Copyright (C) 2018 Gao Xiang <gaoxiang25@huawei.com>
- */
-#ifndef _LINUX_TAGPTR_H
-#define _LINUX_TAGPTR_H
-
-#include <linux/types.h>
-#include <linux/build_bug.h>
-
-/*
- * the name of tagged pointer types are tagptr{1, 2, 3...}_t
- * avoid directly using the internal structs __tagptr{1, 2, 3...}
- */
-#define __MAKE_TAGPTR(n) \
-typedef struct __tagptr##n {	\
-	uintptr_t v;	\
-} tagptr##n##_t;
-
-__MAKE_TAGPTR(1)
-__MAKE_TAGPTR(2)
-__MAKE_TAGPTR(3)
-__MAKE_TAGPTR(4)
-
-#undef __MAKE_TAGPTR
-
-extern void __compiletime_error("bad tagptr tags")
-	__bad_tagptr_tags(void);
-
-extern void __compiletime_error("bad tagptr type")
-	__bad_tagptr_type(void);
-
-/* fix the broken usage of "#define tagptr2_t tagptr3_t" by users */
-#define __tagptr_mask_1(ptr, n)	\
-	__builtin_types_compatible_p(typeof(ptr), struct __tagptr##n) ? \
-		(1UL << (n)) - 1 :
-
-#define __tagptr_mask(ptr)	(\
-	__tagptr_mask_1(ptr, 1) ( \
-	__tagptr_mask_1(ptr, 2) ( \
-	__tagptr_mask_1(ptr, 3) ( \
-	__tagptr_mask_1(ptr, 4) ( \
-	__bad_tagptr_type(), 0)))))
-
-/* generate a tagged pointer from a raw value */
-#define tagptr_init(type, val) \
-	((typeof(type)){ .v = (uintptr_t)(val) })
-
-/*
- * directly cast a tagged pointer to the native pointer type, which
- * could be used for backward compatibility of existing code.
- */
-#define tagptr_cast_ptr(tptr) ((void *)(tptr).v)
-
-/* encode tagged pointers */
-#define tagptr_fold(type, ptr, _tags) ({ \
-	const typeof(_tags) tags = (_tags); \
-	if (__builtin_constant_p(tags) && (tags & ~__tagptr_mask(type))) \
-		__bad_tagptr_tags(); \
-tagptr_init(type, (uintptr_t)(ptr) | tags); })
-
-/* decode tagged pointers */
-#define tagptr_unfold_ptr(tptr) \
-	((void *)((tptr).v & ~__tagptr_mask(tptr)))
-
-#define tagptr_unfold_tags(tptr) \
-	((tptr).v & __tagptr_mask(tptr))
-
-/* operations for the tagger pointer */
-#define tagptr_eq(_tptr1, _tptr2) ({ \
-	typeof(_tptr1) tptr1 = (_tptr1); \
-	typeof(_tptr2) tptr2 = (_tptr2); \
-	(void)(&tptr1 == &tptr2); \
-(tptr1).v == (tptr2).v; })
-
-/* lock-free CAS operation */
-#define tagptr_cmpxchg(_ptptr, _o, _n) ({ \
-	typeof(_ptptr) ptptr = (_ptptr); \
-	typeof(_o) o = (_o); \
-	typeof(_n) n = (_n); \
-	(void)(&o == &n); \
-	(void)(&o == ptptr); \
-tagptr_init(o, cmpxchg(&ptptr->v, o.v, n.v)); })
-
-/* wrap WRITE_ONCE if atomic update is needed */
-#define tagptr_replace_tags(_ptptr, tags) ({ \
-	typeof(_ptptr) ptptr = (_ptptr); \
-	*ptptr = tagptr_fold(*ptptr, tagptr_unfold_ptr(*ptptr), tags); \
-*ptptr; })
-
-#define tagptr_set_tags(_ptptr, _tags) ({ \
-	typeof(_ptptr) ptptr = (_ptptr); \
-	const typeof(_tags) tags = (_tags); \
-	if (__builtin_constant_p(tags) && (tags & ~__tagptr_mask(*ptptr))) \
-		__bad_tagptr_tags(); \
-	ptptr->v |= tags; \
-*ptptr; })
-
-#define tagptr_clear_tags(_ptptr, _tags) ({ \
-	typeof(_ptptr) ptptr = (_ptptr); \
-	const typeof(_tags) tags = (_tags); \
-	if (__builtin_constant_p(tags) && (tags & ~__tagptr_mask(*ptptr))) \
-		__bad_tagptr_tags(); \
-	ptptr->v &= ~tags; \
-*ptptr; })
-
-#endif
-