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

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Date:   Thu, 29 Nov 2018 13:19:53 +0000
From:   Jose Abreu <jose.abreu@...opsys.com>
To:     David Laight <David.Laight@...LAB.COM>,
        '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}()

On 29-11-2018 13:11, Jose Abreu wrote
>> I was thinking of the (probably likely) case where the pointer is
>> actually aligned.
>> An extra check for ((pointer) & 3) is almost certainly a 'win'
>> over the byte accesses and shift/mask/or use by get/put_unaligned().

Oh, sorry. I was misunderstanding. You mean like adding a check
for unaligned and use get/put_unaligned() only in that case right ?

Sorry.

>>
>> The IO accesses probably dominate making more complex optimisations
>> less likely to have any benefit.
>>
>> 	David
>>
>> -
>> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
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