Subject: Re: [RFC] arm64: kexec_file_load support

From: Thiago Jung Bauermann <[email-masked]>
Date: Fri, 08 Jul 2016 11:48:44 -0300

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

-- 
[]'s
Thiago Jung Bauermann
IBM Linux Technology Center