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Date: Tue, 27 May 2014 21:34:28 +0100 From: Will Deacon <will.deacon@....com> To: Benjamin Herrenschmidt <benh@...nel.crashing.org> Cc: "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "arnd@...db.de" <arnd@...db.de>, "monstr@...str.eu" <monstr@...str.eu>, "dhowells@...hat.com" <dhowells@...hat.com>, "broonie@...aro.org" <broonie@...aro.org>, "peterz@...radead.org" <peterz@...radead.org>, "paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com> Subject: Re: [PATCH v2 00/18] Cross-architecture definitions of relaxed MMIO accessors On Tue, May 27, 2014 at 09:23:30PM +0100, Benjamin Herrenschmidt wrote: > On Tue, 2014-05-27 at 20:34 +0100, Will Deacon wrote: > > > Do you mean the io{read,write} functions? Funnily enough, they're already > > relaxed on ARM if you go by the semantics I've proposed. That implies we at > > least need some Documentation to that effect... > > > > What do you do on ppc? > > They are not supposed to be relaxed. If they are, you probably have a > whole lot of busted drivers :-) Lucky me! > They have the same semantics as readl/writel for memory and as inb/outb > for IO space, they just allow to hide the "type" (memory vs. IO) from > most of the driver code. > > We probably need to create a set of _relaxed variants. Ok. I'll try putting together a v3 including this and the mmiowb work. Thanks for the feedback, Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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