On 07/15/16 at 09:09am, Vivek Goyal wrote: > 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. It will not break existing programs because we can use the new param only when the new flag is set. But we have a case below, but I think it is fine? Originally kexec_file_load with the new flags will fail, but now it will succeed and will access the new argument. Thanks Dave
