linux-kernel - Re: [RFC 3/3] kexec: extend kexec_file

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Date:	Fri, 15 Jul 2016 09:09:55 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:	ebiederm@...ssion.com, dyoung@...hat.com, bhe@...hat.com,
	bauerman@...ux.vnet.ibm.com, arnd@...db.de,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC 3/3] kexec: extend kexec_file_load system call

On Tue, Jul 12, 2016 at 10:42:01AM +0900, AKASHI Takahiro wrote:

[..]
> -SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
> +SYSCALL_DEFINE6(kexec_file_load, int, kernel_fd, int, initrd_fd,
>  		unsigned long, cmdline_len, const char __user *, cmdline_ptr,
> -		unsigned long, flags)
> +		unsigned long, flags, const struct kexec_fdset __user *, ufdset)

Can one add more parameters to existing syscall. Can it break existing
programs with new kernel? I was of the impression that one can't do that.
But may be I am missing something.

Vivek