fs/namespace.c:函数原型
SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
char __user *, type, unsigned long, flags, void __user *, data)
include/linux/syscalls.h:一系列宏定义
SYSCALL_DEFINEx(5, _##mount, __VA_ARGS)
__SYSCALL_DEFINEx(5, _##mount, __VA_ARGS)
asmlinkage long sys##_##mount(__SC_DECL##5(__VA_ARGS))
asmlinkage long sys_mount(__SC_DECL5(__VA_ARGS))
asmlinkage long sys_mount(t5 a5, t4 a4, t3 a3, t2 a2, t1 a1)
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