Re: x86-64: Maintain 16-byte stack alignment

[Josh Poimboeuf]

On Thu, Jan 12, 2017 at 11:06:50PM +0800, Herbert Xu wrote:
> On Thu, Jan 12, 2017 at 09:03:18AM -0600, Josh Poimboeuf wrote:
> > 
> > For the entry code, could we just replace all calls with CALL_ALIGNED?
> > That might be less intrusive than trying to adjust all the pt_regs
> > accesses.
> > 
> > Then to ensure that nobody ever uses 'call' directly:
> > 
> >   '#define call please-use-CALL-ALIGNED-instead-of-call'
> > 
> > I think that would be possible if CALL_ALIGNED were a ".macro".
> 
> The trouble with that is that you have got things like TRACE_IRQS_OFF
> which are also used outside of the entry code.

Where?  As far as I can tell, TRACE_IRQS_OFF is used exclusively by entry
code.

-- 
Josh