From mboxrd@z Thu Jan  1 00:00:00 1970
From: vgoyal@redhat.com (Vivek Goyal)
Date: Fri, 15 Jul 2016 09:09:55 -0400
Subject: [RFC 3/3] kexec: extend kexec_file_load system call
In-Reply-To: <20160712014201.11456-4-takahiro.akashi@linaro.org>
References: <20160712014201.11456-1-takahiro.akashi@linaro.org>
 <20160712014201.11456-4-takahiro.akashi@linaro.org>
Message-ID: <20160715130955.GC23514@redhat.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

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