hc
2024-05-14 bedbef8ad3e75a304af6361af235302bcc61d06b
kernel/tools/include/linux/bits.h
....@@ -1,13 +1,15 @@
11 /* SPDX-License-Identifier: GPL-2.0 */
22 #ifndef __LINUX_BITS_H
33 #define __LINUX_BITS_H
4
+
5
+#include <linux/const.h>
6
+#include <vdso/bits.h>
47 #include <asm/bitsperlong.h>
58
6
-#define BIT(nr) (1UL << (nr))
7
-#define BIT_ULL(nr) (1ULL << (nr))
8
-#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
9
+#define BIT_ULL(nr) (ULL(1) << (nr))
10
+#define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG))
911 #define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
10
-#define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG))
12
+#define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG))
1113 #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
1214 #define BITS_PER_BYTE 8
1315
....@@ -16,11 +18,29 @@
1618 * position @h. For example
1719 * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
1820 */
19
-#define GENMASK(h, l) \
20
- (((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
21
+#if !defined(__ASSEMBLY__)
22
+#include <linux/build_bug.h>
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+#define GENMASK_INPUT_CHECK(h, l) \
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+ (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
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+ __is_constexpr((l) > (h)), (l) > (h), 0)))
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+#else
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+/*
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+ * BUILD_BUG_ON_ZERO is not available in h files included from asm files,
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+ * disable the input check if that is the case.
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+ */
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+#define GENMASK_INPUT_CHECK(h, l) 0
32
+#endif
2133
34
+#define __GENMASK(h, l) \
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+ (((~UL(0)) - (UL(1) << (l)) + 1) & \
36
+ (~UL(0) >> (BITS_PER_LONG - 1 - (h))))
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+#define GENMASK(h, l) \
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+ (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
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+
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+#define __GENMASK_ULL(h, l) \
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+ (((~ULL(0)) - (ULL(1) << (l)) + 1) & \
42
+ (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h))))
2243 #define GENMASK_ULL(h, l) \
23
- (((~0ULL) - (1ULL << (l)) + 1) & \
24
- (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
44
+ (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l))
2545
2646 #endif /* __LINUX_BITS_H */