Re: [PATCH] memory-model: fix cheat sheet typo

[Peter Zijlstra]

On Wed, Apr 11, 2018 at 09:19:56AM -0700, Paul E. McKenney wrote:

> > 
> >                                    Prior Operation   Subsequent Operation
> >                                    ---------------   ---------------------
> >                                    R  W  RMW  SV     R  W  DR  DW  RMW  SV
> >                                    -  -  ---  --     -  -  --  --  ---  --

> > smp_store_mb()                     Y  Y    Y   Y      Y  Y   Y   Y   Y   Y

I'm not sure about that, the generic version of that reads:

include/asm-generic/barrier.h:#define __smp_store_mb(var, value)  do { WRITE_ONCE(var, value); __smp_mb(); } while (0)

Which doesn't not have an smp_mb() before, so it doesn't actually order
prior; or I'm failing to read the table wrong.