On Mon, Aug 15, 2016 at 11:04:42AM -0700, H. Peter Anvin wrote: > On 08/15/16 08:09, Josh Poimboeuf wrote: > > On Sun, Aug 14, 2016 at 12:31:47AM -0700, Andy Lutomirski wrote: > >> On Fri, Aug 12, 2016 at 7:28 AM, Josh Poimboeuf <jpoim...@redhat.com> > >> wrote: > >>> This standardizes the stacks of idle tasks to be consistent with other > >>> tasks on 32-bit. > >> > >> It might be nice to stick a ud2 or 1: hlt; jmp 1b or similar > >> afterwards to make it clear that initial_code can't return. > > > > Yeah, I'll do something like that. > > > > "Standardizing the stack" how? A zero on the stack terminates the stack > trace.
Instead of zero, user tasks have a real return address at that spot. This makes idle tasks consistent with that, so we have a well defined "end of stack". Also it makes the stack trace more useful since it shows what entry code was involved in calling into C. -- Josh
