Re: [PATCH] hwmon: xgene: access mailbox as RAM
From: Arnd Bergmann
Date: Fri Sep 09 2016 - 16:52:14 EST
On Friday, September 9, 2016 1:43:17 PM CEST Hoan Tran wrote:
> > * Are you sure you don't need any smp_rmb()/smp_wmb() barriers
> > between the accesses?
> No, we don't need a strict read/write during access PCC subspace. Just
> make sure all access is committed before PCC send message to the
> platform which done by PCC mailbox driver.
Ok, got it. The PCC mailbox driver presumably uses writel() to
send the message, and that implies the necessary barrier
(unlike writel_relaxed), right?