linux-kernel - Re: [PATCH 0/5] x86: minor PAT adaptations

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Date:	Thu, 12 Jun 2008 12:01:10 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Suresh B Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH 0/5] x86: minor PAT adaptations

On Thu, Jun 12, 2008 at 10:10:29AM +0200, Ingo Molnar wrote:
> 
> * Andreas Herrmann <andreas.herrmann3@....com> wrote:
> 
> > Following some patches to slightly adapt the PAT code.
> > 
> > patch 1 - enable PAT for all AMD CPUs that have the PAT feature flag set
> > patch 2 - fix up paranoia check in pat_init and fix the logic to
> >           enable/disable PAT (IMHO the current code enables PAT on all
> >           Transmeta and Centaur CPUs even if no PAT feature flag is set) 
> >           (I admit I should have changed the sequence of patches 1 and 2.)
> > patch 3 - fix some checkpatch errors
> > patch 4 - variable renaming
> 
> applied to tip/x86/pat, thanks Andreas. (i presume you'll send a 
> followup patch for the suggestions that came up in the discussion)

Yes, I'll do.

> > patch 5 - slightly changing the code that is doing the intersection of
> >           pat_type and mtrr_type to be more readable (from my point of view)
> > 
> > Patches are against x86/pat (as of version v2.6.26-rc3-6-g46dd98a).
> 
> #5 makes sense too, but it didnt apply cleanly:

That's odd. I've double checked it by doing a fresh

$ git remote add tip git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git
$ git remote update
$ git checkout tip/x86/pat

and applying patches 1-5 in sequence without problems.
(Patches were taken from emails that arrived via my linux-kernel
subscription.) Probably your tip/x86/pat is not at
v2.6.26-rc3-6-g46dd98a?

When trying to apply the patches to tip/master I get rejects for
patches 3 and 5.

Hence I think creating my patches against a feature branch was not a
good idea.

>  Applying patch 
>  patches/pat-x86-pat-make-pat-x-mtrr-type-more-readable.patch
>  patching file arch/x86/mm/pat.c
>  Hunk #1 FAILED at 185.
>  1 out of 1 hunk FAILED -- rejects in file arch/x86/mm/pat.c
> 
> (it didnt apply neither against tip/x86/pat or tip/master, nor against 
> linus/master. I guess it's some mixup somewhere.)

Ok, it's commit 282c454cd3a7041f59a37112bb2f82263bc38f6c which was not
contained in the tip/x86/pat branch. This means I have to adapt patch 5.

Finally a dumb question. What patches do you prefer?
Patches against feature branches (say tip/x86/foo), against tip/master
or against tip/auto-latest as described in your tip.git-Readme?


Thanks,

Andreas


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