linux-kernel - Re: [PATCH] ARM: Ignore memory tags with invalid data

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Message-id: <4795FEE2.3090703@acm.org>
Date:	Tue, 22 Jan 2008 08:34:10 -0600
From:	Corey Minyard <minyard@....org>
To:	Ben Dooks <ben@...ff.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, hvr@....org,
	rmk@....linux.org.uk, nico@....org
Subject: Re: [PATCH] ARM: Ignore memory tags with invalid data

Ben Dooks wrote:
> On Mon, Jan 21, 2008 at 10:05:56PM -0600, Corey Minyard wrote:
>   
>> From: Corey Minyard <minyard@....org>
>>
>> The DNS-323 system has several bogus memory entries in the tag table,
>> and it caused the system to crash at startup.  Ignore tag entries that
>> are obviously bogus.
>>     
>
> This should have gone to the linux-arm-kernel mailing list as well,
> so that all the people interested in ARM can see it as soon as
> possible. See linux-arm-kernel@...ts.arm.linux.org.uk
>   
You have to be a member to post, and I'm not a member.  I guess I'll 
join, though it seems somewhat pointless for a single patch.

> The only suggestion I could think of would to be change to having
> an check_tag_mem32() function, or put each check on its own line
> to make it easier to read what each check is doing.
>
> ie:
> 	if (meminfo.nr_banks >= NR_BANKS ||
> 	    tag->u.mem.size & ~PAGE_MASK || /* size is unaligned */
> 	    tag->u.mem.size == 0 ||	    /* no memory here */
> 	    tag->u.mem.start & ~PAGE_MASK)  /* start is unaligned */ 
> 	{
>
> (even without the comments it makes it easier to see what each test
> is.
>   
That's fine, it is easier to read.

Thanks,

-corey
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