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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/bits.h
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@@ -6,10 +6,10 @@
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 #include <vdso/bits.h>
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 #include <asm/bitsperlong.h>
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-#define BIT_ULL(nr)		(1ULL << (nr))
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-#define BIT_MASK(nr)		(1UL << ((nr) % BITS_PER_LONG))
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+#define BIT_ULL(nr)		(ULL(1) << (nr))
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+#define BIT_MASK(nr)		(UL(1) << ((nr) % BITS_PER_LONG))
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 #define BIT_WORD(nr)		((nr) / BITS_PER_LONG)
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-#define BIT_ULL_MASK(nr)	(1ULL << ((nr) % BITS_PER_LONG_LONG))
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+#define BIT_ULL_MASK(nr)	(ULL(1) << ((nr) % BITS_PER_LONG_LONG))
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 #define BIT_ULL_WORD(nr)	((nr) / BITS_PER_LONG_LONG)
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 #define BITS_PER_BYTE		8
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@@ -18,11 +18,29 @@
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  * position @h. For example
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  * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
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  */
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-#define GENMASK(h, l) \
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-	(((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
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+#if !defined(__ASSEMBLY__)
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+#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
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+#endif
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+#define __GENMASK(h, l) \
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+	(((~UL(0)) - (UL(1) << (l)) + 1) & \
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+	 (~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) & \
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+	 (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h))))
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 #define GENMASK_ULL(h, l) \
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-	(((~0ULL) - (1ULL << (l)) + 1) & \
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-	 (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
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+	(GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l))
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 #endif	/* __LINUX_BITS_H */