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

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Date:   Thu, 29 Nov 2018 12:55:10 +0000
From:   Alexey Brodkin <alexey.brodkin@...opsys.com>
To:     Jose Abreu <jose.abreu@...opsys.com>
CC:     Vitor Soares <vitor.soares@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Joao Pinto <joao.pinto@...opsys.com>,
        "Vineet Gupta" <vineet.gupta1@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH] ARC: io.h: Implement reads{x}()/writes{x}()

Hi Jose,

On Thu, 2018-11-29 at 12:42 +0000, Jose Abreu wrote:
> 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.
> 
> We do not implement readsq()/writesq() as we assume that only HS is a
> 64 Bit CPU and that it supports unaligned loads/stores.

Pls note that ARC HS is still only 32-bit core at least as of today.

-Alexey