Re: [Intel-wired-lan] [PATCH v3 09/18] fm10k: Eliminate duplicate barriers on weakly-ordered archs

[Alexander Duyck]

On Fri, Mar 16, 2018 at 9:16 AM, Sinan Kaya <okaya@xxxxxxxxxxxxxx> 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 barrier call, changing writel() to
> writel_relaxed().
>
> Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>

You can update the writel call in fm10k_tx_map as well.

Of the drivers updated in drivers/net/ethernet/intel/* it looks like
this is the only one that still requires any additional changes.

Thanks.

- Alex