Re: [RFC] arm64: kexec_file_load support

On 07/08/16 at 11:48am, Thiago Jung Bauermann wrote:

Am Donnerstag, 07 Juli 2016, 14:12:45 schrieb Dave Young:

quoted

If so maybe change a bit from your precious mentioned 7 args proposal like
below?

struct kexec_file_fd {
	enum kexec_file_type;
	int fd;
}

struct kexec_fdset {
	int nr_fd;
	struct kexec_file_fd fd[0];
}

int kexec_file_load(int kernel_fd, int initrd_fd,
		    unsigned long cmdline_len, const char *cmdline_ptr,
		    unsigned long flags, struct kexec_fdset *extra_fds);

Is there a way for the kernel to distinguish whether the process passed 5 or 
6 arguments? How can it know whether extra_fds is a valid argument or just 
garbage? I think we have to define a new flag KEXEC_FILE_EXTRA_FDS so that 
the process can signal that it is using the new interface.

Agreed, a new flag is needed.

Thanks
Dave