linux-kernel - Re: [PATCH] ARCv2: Add explcit unaligned access support (and ability to disable too)

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Message-ID: <C2D7FE5348E1B147BCA15975FBA2307501464381EE@US01WEMBX2.internal.synopsys.com>
Date:   Thu, 28 Feb 2019 19:24:43 +0000
From:   Vineet Gupta <vineet.gupta1@...opsys.com>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     Eugeniy Paltsev <eugeniy.paltsev@...opsys.com>,
        Claudiu Zissulescu <claudiu.zissulescu@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARCv2: Add explcit unaligned access support (and
 ability to disable too)

On 2/28/19 10:59 AM, Guenter Roeck wrote:
>> Once the patch hits mainline you could use that. In the mean time I'll back out
>> the "detector" as it might trip other people too.
>>
> Can you possibly use $(cc-option,-mno-unaligned-access), or would that
> defeat the purpose ?
>

Indeed I was looking into Kconfig documentation and found something similar.
However there's an anti-dependency. It is enabled by default and can only be
disabled with $(cc-option,-mno-unaligned-access)
So guess we will have to change  ARC_USE_UNALIGNED_MEM_ACCESS to
ARC_*LACKS*_UNALIGNED_MEM_ACCESS

I'll tinker a bit and post an update soon.

-Vineet