From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Fri, 09 Sep 2016 22:50:43 +0200 Subject: [PATCH] hwmon: xgene: access mailbox as RAM In-Reply-To: References: <1469134557-26869-1-git-send-email-hotran@apm.com> <2852054.37zytD0HIa@wuerfel> Message-ID: <6198994.YhDCC7xNAM@wuerfel> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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? Arnd