linux-kernel - Re: [PATCH 1/2] MIPS: memset.S: EVA & fault support for small

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Message-ID: <cc6ab882-6862-2cdc-fdaf-cf0d0ba22728@mips.com>
Date:   Tue, 17 Apr 2018 14:20:07 +0100
From:   Matt Redfearn <matt.redfearn@...s.com>
To:     James Hogan <jhogan@...nel.org>
CC:     Ralf Baechle <ralf@...ux-mips.org>, <linux-mips@...ux-mips.org>,
        <stable@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] MIPS: memset.S: EVA & fault support for small_memset

Hi James,

On 16/04/18 21:22, James Hogan wrote:
> On Thu, Mar 29, 2018 at 10:28:23AM +0100, Matt Redfearn wrote:
>> @@ -260,6 +260,11 @@
>>   	jr		ra
>>   	andi		v1, a2, STORMASK
> 
> This patch looks good, well spotted!
> 
> But whats that v1 write about? Any ideas? Seems to go back to the git
> epoch, and $3 isn't in the clobber lists when __bzero* is called.

No idea what the original intent was, but I've verified that v1 does 
indeed get clobbered if this path is hit. Patch incoming!

Thanks,
Matt

> 
> Cheers
> James
> 
>>   
>> +.Lsmall_fixup\@:
>> +	PTR_SUBU	a2, t1, a0
>> +	jr		ra
>> +	 PTR_ADDIU	a2, 1
>> +