On Wed, Jun 09, 2021 at 03:05:52PM +0000, David Laight wrote: > In principle some writel() could generate PCIe write TLP (going > to the target) that have the 'relaxed ordering' bit set. In Linux we call this writel_relaxed(), though I know of no implementation that sets the RO bit in the TLP based on this, it would be semantically correct to do so. writel() has strong order requirements and must not generate a RO TLP. Jason
