From: Ingo Molnar <mingo@kernel.org>
To: Toshi Kani <toshi.kani@hpe.com>
Cc: bp@suse.de, hpa@zytor.com, tglx@linutronix.de, mcgrof@suse.com,
jgross@suse.com, paul.gortmaker@windriver.com, x86@kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] x86/mtrr: Refactor PAT initialization code
Date: Fri, 11 Mar 2016 10:13:01 +0100 [thread overview]
Message-ID: <20160311091301.GA11595@gmail.com> (raw)
In-Reply-To: <20160311090140.GA4873@gmail.com>
* Ingo Molnar <mingo@kernel.org> wrote:
>
> * Toshi Kani <toshi.kani@hpe.com> wrote:
>
> > MTRR manages PAT initialization as it implements a rendezvous
> > handler that initializes PAT as part of MTRR initialization.
> >
> > When CPU does not support MTRR, ex. qemu32 virtual CPU, MTRR
> > simply skips PAT init, which causes PAT left enabled without
> > initialization. [...]
>
> What practical effects does this have to the user? Does the kernel crash?
Btw., I find this omission _highly_ annoying: describing what negative effects a
bug _causes in practice_ is the most important part of a changelog. How on earth
can an experienced contributor omit such an important component from a patch
description?
Most readers of changelogs couldn't care less about technical details of how the
bug is fixed (of course others will read it so it's nice to have too), but what
symptoms a bug causes, how serious is it, whether it should be backported are like
super important compared to everything else you wrote - and both the description
and the changelogs are totally silent on those topics ...
I've seen this in other PAT patches - please try to improve this.
Thanks,
Ingo
next prev parent reply other threads:[~2016-03-11 9:14 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-11 4:45 [PATCH 0/2] Refactor MTRR and PAT initializations Toshi Kani
2016-03-11 4:45 ` [PATCH 1/2] x86/mm/pat: Change pat_disable() to emulate PAT table Toshi Kani
2016-03-11 9:12 ` Borislav Petkov
2016-03-11 16:27 ` Toshi Kani
2016-03-11 15:54 ` Borislav Petkov
2016-03-11 19:28 ` Toshi Kani
2016-03-12 11:55 ` Borislav Petkov
2016-03-14 21:37 ` Toshi Kani
2016-03-15 11:00 ` Borislav Petkov
2016-03-15 22:02 ` Toshi Kani
2016-03-15 0:29 ` Luis R. Rodriguez
2016-03-15 3:11 ` Toshi Kani
2016-03-15 11:01 ` Borislav Petkov
2016-03-15 15:43 ` Toshi Kani
2016-03-15 15:47 ` Borislav Petkov
2016-03-15 17:11 ` Toshi Kani
2016-03-15 16:33 ` Borislav Petkov
2016-03-15 21:31 ` Luis R. Rodriguez
2016-03-11 4:45 ` [PATCH 2/2] x86/mtrr: Refactor PAT initialization code Toshi Kani
2016-03-11 9:01 ` Ingo Molnar
2016-03-11 9:13 ` Ingo Molnar [this message]
2016-03-11 18:34 ` Toshi Kani
2016-03-12 16:18 ` Ingo Molnar
2016-03-14 19:47 ` Toshi Kani
2016-03-14 22:50 ` Luis R. Rodriguez
2016-03-15 0:37 ` Toshi Kani
2016-03-15 15:56 ` Borislav Petkov
2016-03-16 15:44 ` Joe Lawrence
2016-03-11 9:24 ` Borislav Petkov
2016-03-11 18:57 ` Toshi Kani
2016-03-11 22:17 ` Luis R. Rodriguez
2016-03-11 23:56 ` Toshi Kani
2016-03-11 23:34 ` Luis R. Rodriguez
2016-03-12 1:16 ` Toshi Kani
2016-03-15 0:15 ` Luis R. Rodriguez
2016-03-15 23:48 ` Toshi Kani
2016-03-15 23:29 ` Luis R. Rodriguez
2016-03-17 21:56 ` Toshi Kani
2016-03-18 0:06 ` Luis R. Rodriguez
2016-03-18 21:35 ` Toshi Kani
2016-03-29 17:14 ` Luis R. Rodriguez
2016-03-29 21:46 ` Toshi Kani
2016-03-29 22:12 ` Luis R. Rodriguez
2016-03-30 0:16 ` Toshi Kani
2016-03-29 23:43 ` Luis R. Rodriguez
2016-03-30 1:07 ` Toshi Kani
2016-03-30 0:34 ` Luis R. Rodriguez
2016-04-09 2:04 ` Luis R. Rodriguez
2016-04-11 14:30 ` Toshi Kani
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