linux-kernel - RE: [PATCH] ARC: io.h: Implement reads{x}()/writes{x}()

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Date:   Thu, 29 Nov 2018 12:47:59 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Jose Abreu' <jose.abreu@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Vineet Gupta <vineet.gupta1@...opsys.com>,
        Alexey Brodkin <alexey.brodkin@...opsys.com>,
        Joao Pinto <joao.pinto@...opsys.com>,
        "Vitor Soares" <vitor.soares@...opsys.com>
Subject: RE: [PATCH] ARC: io.h: Implement reads{x}()/writes{x}()

From: Jose Abreu
> Sent: 29 November 2018 12:42
> 
> Some ARC CPU's do not support unaligned loads/stores. Currently, generic
> implementation of reads{b/w/l}()/writes{b/w/l}() is being used with ARC.
> This can lead to misfunction of some drivers as generic functions do a
> plain dereference of a pointer that can be unaligned.
> 
> Let's use {get/put}_unaligned() helper instead of plain dereference of
> pointer in order to fix this.

Is it worth adding a check for the pointer being aligned?

	David

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