linux-kernel - Re: [PATCH] GHES: Fix cached error-status

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Message-ID: <87611uz56k.fsf@yhuang-dev.intel.com>
Date:	Mon, 26 Oct 2015 11:20:35 +0800
From:	"Huang\, Ying" <ying.huang@...ux.intel.com>
To:	"Luck\, Tony" <tony.luck@...el.com>
Cc:	Davidlohr Bueso <dave@...olabs.net>,
	"Huang\, Ying" <ying.huang@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Borislav Petkov <bp@...e.de>,
	"linux-acpi\@vger.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] GHES: Fix cached error-status

Hi, Tony,

"Luck, Tony" <tony.luck@...el.com> writes:
>> ping?
>
> I'm not actually sure that the code is wrong.  As you say it is a pretty strange loop.
>
> We seem to want to look at a bunch of conditions, and use "continue" to ignore
> bits until we find one that we like the look of.  Perhaps as soon as we do, we want
> to believe it to get our return value? Perhaps the code knows that we won't find
> another section that matches all the tests, so it isn't worth going around the loop
> again.
>
> Ying: You wrote this code 4 years ago. Any recollections of why it looks like it does?

Sorry for late.  I read the code again, and found the although the
original code is a little tricky, it actually works.

In ghes_estatus_caches[], for caches with same contents, the cache with
biggest (newest) cache->time_in should be the first.  So if we found one
cache with too small (old) cache->time_in, we can say there are no cache
with same contents and bigger (newer) cache->time_in, so that we can
make decision (break) earlier.

Best Regards,
Huang, Ying
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