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The asmlinkage tag tells gcc that that the function should not expect to find any of its arguments in registers (a common optimization), but only on the CPU's stack. Many kernel functions use the fact, that system_call consumes its first argument, the system call number, and leaves other arguments (which were passed to it in registers) on the stack. All system calls are marked with the asmlinkage tag, so they all look to the stack for arguments.

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