linux-kernel - Re: [RFC] arm: memtest

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Message-ID: <509C8DF4.4070300@ahsoftware.de>
Date:	Fri, 09 Nov 2012 06:00:36 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC] arm: memtest

Am 08.11.2012 23:39, schrieb Yinghai Lu:
> On Thu, Nov 8, 2012 at 12:48 PM, Alexander Holler <holler@...oftware.de> wrote:
>> Hello,
>>
>> I've recently discovered the lack of the command line parameter memtest for
>> ARM. So I've made a patch.
>>
>> But I have some questions:
>>
>> 1. arch/x86/mm/memtest.c looks platform independ.
>> The only thing why I don't use it for arm, is because it uses 64bit
>> pointers. Maybe it could be moved to mm/memtest.c. If so, the memtest32.c
>> I'm using (basically a copy of memtest.c) could be moved there too.
>>
>> 2. Because the below memtest32.c is basically a copy of
>> arch/x86/mm/memtest.c, I'm not sure if the mapping from physical to virtual
>> locations there does fit (always) for ARM too. I know almost as much about
>> the in-kernel memory organization on x86 as on ARM, which is not really that
>> much (some theory about TLBs, some source code explorations, ..., but I'm
>> working on it). ;)
>
> We are using arch/x86/mm/memtest.c for x86 32bit and 64bit.
>
> So it should be ok to use it with arm 32bit and 64bit directly.

It does. But in order to enable it on every boot, I wanted it to be as 
fast as possible.

Regards,

Alexander

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