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hc

2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/kernel/bpf/tnum.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* tnum: tracked (or tristate) numbers
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  *
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  * A tnum tracks knowledge about the bits of a value.  Each bit can be either
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@@ -193,3 +194,18 @@
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 	str[min(size - 1, (size_t)64)] = 0;
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 	return 64;
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 }
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+
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+struct tnum tnum_subreg(struct tnum a)
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+{
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+	return tnum_cast(a, 4);
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+}
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+
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+struct tnum tnum_clear_subreg(struct tnum a)
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+{
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+	return tnum_lshift(tnum_rshift(a, 32), 32);
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+}
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+
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+struct tnum tnum_const_subreg(struct tnum a, u32 value)
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+{
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+	return tnum_or(tnum_clear_subreg(a), tnum_const(value));
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+}