linux-kernel - Re: [PATCH] [8/8] RFC: Fix some EFI problems

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Date:	Tue, 12 Feb 2008 21:23:08 +0100
From:	Andi Kleen <ak@...e.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	ying.huang@...el.com, mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [8/8] RFC: Fix some EFI problems

On Tuesday 12 February 2008 21:04:06 Thomas Gleixner wrote:

> 
> And you just copied the real bug in that logic as well:
> 
>           set_memory_uc(md->virt_addr, size);

Oops you're right. I wanted to fix that, but didn't. Ok I'll put up
my brown paper back tonight when I go out.

> ------------------------^^^^^^^^
> 
> which is initialized a couple of lines down.
> 
> 	md->virt_addr = (u64) (unsigned long) va;
> 
> The reordering/optimizing needs to be a separate patch.

What optimizing? It wasn't intended to be an optimization.
It fixes a bug.

Not doing set_memory_uc on efi_ioremap output is needed because 
set_memory_uc doesn't work on fixmap which is what efi_ioremap
returns. 

(see previous mails on that topic -- i fixed the 'x' case,
but fixing "uc" is too hard imho) 

So I fixed efi_ioremap instead to set the correct caching
mode directly. That is ok because there can be no overlap 
with the direct mapping, so no aliases to fix up.

> Please keep bugfixes and other changes separate.
>  
> > +		/* RED-PEN does not handle overlapped areas */
> 
> Can you please use CHECKME/FIXME which is used everywhere else. No need to
> invent an extra marker.

I've always used RED-PEN

% grep -r RED-PEN arch/x86/* | wc -l
12
%

It comes originally from network code I hacked a long time ago, although
most of those got lost over time (only 2 left, sniff) 

Sorry I don't want to change this now and I doubt that will really cause
a problem for anybody.

I'll send an updated patch with the va thing fixed.

-Andi

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