Re: [PATCH 3/5] MIPS: Only change $28 to thread_info if coming from user mode

[Maciej W. Rozycki]

On Mon, 5 Dec 2016, Paul Burton wrote:

> Agreed we ought to use .set reorder (or rather, not use .set noreorder) 
> wherever possible but FYI one thing I've only noticed recently is that we 
> don't actually get any reordering anyway, presumably because we don't provide 
> any -O flags when building asm source. I haven't yet done the legwork or 
> figuring out whether we've ever had optimisation & if so what changed...

 Reordering or `-O2' is the default for GAS, you actually have to pass a 
different `-O*' option explicitly to GAS to disable it.  NB it's *not* the 
same as passing one of the `-O*' options to GCC, you'd need e.g. `-Wa,-O'.

 So perhaps one of our Makefiles or a particular configuration of the GCC 
driver does the wrong thing?

  Maciej