移去rt

hc

2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/bitfield.h
..
..
@@ -1,15 +1,7 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
1
2
 /*
2
3
  * Copyright (C) 2014 Felix Fietkau <nbd@nbd.name>
3
4
  * Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
4
- *
5
- * This program is free software; you can redistribute it and/or modify
6
- * it under the terms of the GNU General Public License version 2
7
- * as published by the Free Software Foundation
8
- *
9
- * This program is distributed in the hope that it will be useful,
10
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12
- * GNU General Public License for more details.
13
5
  */
14
6
 
15
7
 #ifndef _LINUX_BITFIELD_H
..
..
@@ -49,6 +41,22 @@
49
41
 
50
42
 #define __bf_shf(x) (__builtin_ffsll(x) - 1)
51
43
 
44
+#define __scalar_type_to_unsigned_cases(type)				\
45
+		unsigned type:	(unsigned type)0,			\
46
+		signed type:	(unsigned type)0
47
+
48
+#define __unsigned_scalar_typeof(x) typeof(				\
49
+		_Generic((x),						\
50
+			char:	(unsigned char)0,			\
51
+			__scalar_type_to_unsigned_cases(char),		\
52
+			__scalar_type_to_unsigned_cases(short),		\
53
+			__scalar_type_to_unsigned_cases(int),		\
54
+			__scalar_type_to_unsigned_cases(long),		\
55
+			__scalar_type_to_unsigned_cases(long long),	\
56
+			default: (x)))
57
+
58
+#define __bf_cast_unsigned(type, x)	((__unsigned_scalar_typeof(type))(x))
59
+
52
60
 #define __BF_FIELD_CHECK(_mask, _reg, _val, _pfx)			\
53
61
 	({								\
54
62
 		BUILD_BUG_ON_MSG(!__builtin_constant_p(_mask),		\
..
..
@@ -57,10 +65,24 @@
57
65
 		BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ?		\
58
66
 				 ~((_mask) >> __bf_shf(_mask)) & (_val) : 0, \
59
67
 				 _pfx "value too large for the field"); \
60
-		BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull,		\
68
+		BUILD_BUG_ON_MSG(__bf_cast_unsigned(_mask, _mask) >	\
69
+				 __bf_cast_unsigned(_reg, ~0ull),	\
61
70
 				 _pfx "type of reg too small for mask"); \
62
71
 		__BUILD_BUG_ON_NOT_POWER_OF_2((_mask) +			\
63
72
 					      (1ULL << __bf_shf(_mask))); \
73
+	})
74
+
75
+/**
76
+ * FIELD_MAX() - produce the maximum value representable by a field
77
+ * @_mask: shifted mask defining the field's length and position
78
+ *
79
+ * FIELD_MAX() returns the maximum value that can be held in the field
80
+ * specified by @_mask.
81
+ */
82
+#define FIELD_MAX(_mask)						\
83
+	({								\
84
+		__BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_MAX: ");	\
85
+		(typeof(_mask))((_mask) >> __bf_shf(_mask));		\
64
86
 	})
65
87
 
66
88
 /**
..
..
@@ -118,6 +140,7 @@
118
140
 {
119
141
 	return field / field_multiplier(field);
120
142
 }
143
+#define field_max(field)	((typeof(field))field_mask(field))
121
144
 #define ____MAKE_OP(type,base,to,from)					\
122
145
 static __always_inline __##type type##_encode_bits(base v, base field)	\
123
146
 {									\