On Wed, Mar 28, 2018 at 6:02 AM, Sinan Kaya <ok...@codeaurora.org> wrote: > +linux-ia64 > Does IA64 follow this requirement? If not, is implementation planned? > > "no wmb() before writel()" > > Linus asked us to get rid of wmb() in front of writel() for UC memory. > Just checking that we are not breaking anything for IA64.
We should be OK on ia64, writel() uses a cast to: *(volatile unsigned int __force *) which the compiler takes as a request to use a "st4.rel" instruction (meaning "store with release semantics"). So the value stored will be visible to anything that follows. -Tony
