On Wed, Jun 17, 2015 at 08:42:45AM -0700, Paul E. McKenney wrote: > > I would very much prefer a compiler switch that instructs the compiler > > to not do bloody stupid things like this instead of marking every other > > load/store in the kernel with volatile. > > I would of course be good with such a compiler switch, though my earlier > attempts to negotiate one were unsuccessful. But I don't believe that we > discussed a switch to specifically prohibit only use of to-be-stored-into > variables as temporary scratch space. The trick is finding restrictions > that are useful, but that don't imply -O0.
I would request on that disables all the 'stores from thin air' 'optimizations'. IOW assume everything is shared memory and concurrent unless you can prove its not so. For example a local stack variable that does not escape scope. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
