change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/kernel/bpf/tnum.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /* tnum: tracked (or tristate) numbers
2
3
  *
3
4
  * A tnum tracks knowledge about the bits of a value.  Each bit can be either
..
..
@@ -193,3 +194,18 @@
193
194
 	str[min(size - 1, (size_t)64)] = 0;
194
195
 	return 64;
195
196
 }
197
+
198
+struct tnum tnum_subreg(struct tnum a)
199
+{
200
+	return tnum_cast(a, 4);
201
+}
202
+
203
+struct tnum tnum_clear_subreg(struct tnum a)
204
+{
205
+	return tnum_lshift(tnum_rshift(a, 32), 32);
206
+}
207
+
208
+struct tnum tnum_const_subreg(struct tnum a, u32 value)
209
+{
210
+	return tnum_or(tnum_clear_subreg(a), tnum_const(value));
211
+}