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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/arch/x86/include/uapi/asm/unistd.h
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@@ -2,7 +2,14 @@
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 #ifndef _UAPI_ASM_X86_UNISTD_H
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 #define _UAPI_ASM_X86_UNISTD_H
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-/* x32 syscall flag bit */
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+/*
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+ * x32 syscall flag bit.  Some user programs expect syscall NR macros
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+ * and __X32_SYSCALL_BIT to have type int, even though syscall numbers
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+ * are, for practical purposes, unsigned long.
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+ *
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+ * Fortunately, expressions like (nr & ~__X32_SYSCALL_BIT) do the right
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+ * thing regardless.
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+ */
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 #define __X32_SYSCALL_BIT	0x40000000
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 #ifndef __KERNEL__