Re: [Intel-wired-lan] [PATCH v6 1/7] i40e/i40evf: Eliminate duplicate barriers on weakly-ordered archs

2018-03-23 Thread Alexander Duyck
On Fri, Mar 23, 2018 at 11:21 AM, Sinan Kaya wrote: > Code includes wmb() followed by writel(). writel() already has a barrier > on some architectures like arm64. > > This ends up CPU observing two barriers back to back before executing the > register write. > > Since code already has an explicit

[PATCH v6 1/7] i40e/i40evf: Eliminate duplicate barriers on weakly-ordered archs

2018-03-23 Thread Sinan Kaya
Code includes wmb() followed by writel(). writel() already has a barrier on some architectures like arm64. This ends up CPU observing two barriers back to back before executing the register write. Since code already has an explicit barrier call, changing writel() to writel_relaxed(). Signed-off-