From: Borislav Petkov <bp@alien8.de>
To: "Zheng, Lv" <lv.zheng@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>,
Jiri Kosina <jkosina@suse.cz>, Borislav Petkov <bp@suse.de>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>, "Luck, Tony" <tony.luck@intel.com>,
Tomasz Nowicki <tomasz.nowicki@linaro.org>,
"Chen, Gong" <gong.chen@linux.intel.com>,
Wolfram Sang <wsa@the-dreams.de>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH 5/5] GHES: Make NMI handler have a single reader
Date: Tue, 28 Apr 2015 09:38:20 +0200 [thread overview]
Message-ID: <20150428073819.GA19025@pd.tnic> (raw)
In-Reply-To: <1AE640813FDE7649BE1B193DEA596E880270F5C8@SHSMSX101.ccr.corp.intel.com>
On Tue, Apr 28, 2015 at 02:24:16AM +0000, Zheng, Lv wrote:
> > > #APP
> > > # 177 "./arch/x86/include/asm/atomic.h" 1
> > > .pushsection .smp_locks,"a"
> > > .balign 4
> > > .long 671f - .
> > > .popsection
> > > 671:
> > > lock; cmpxchgl %edx,ghes_in_nmi(%rip) # D.37056, MEM[(volatile u32 *)&ghes_in_nmi]
> > > # 0 "" 2
> > > #NO_APP
> > >
> > > And you need to atomic_dec() so that another reader can enter, i.e. how
> > > the exclusion primitive works.
> > >
> > > Or did you have something else in mind?
> >
> > My mistake.
> > I mean cmpxchg() and xchg() (or atomic_cmpxchg() and atomic_xchg()) pair here, so nothing can be reduced.
>
> Let me correct, it should be atomic_cmpxchg() and atomic_set() here as you only need to switch between 0 and 1.
> Sorry for the noise.
I still don't understand what you want from me here. You need to go into
more detail.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
next prev parent reply other threads:[~2015-04-28 7:38 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-27 9:22 [RFC PATCH 0/5] GHES NMI handler cleanup Borislav Petkov
2015-03-27 9:22 ` [RFC PATCH 1/5] GHES: Carve out error queueing in a separate function Borislav Petkov
2015-03-27 9:22 ` [RFC PATCH 2/5] GHES: Carve out the panic functionality Borislav Petkov
2015-03-27 9:22 ` [RFC PATCH 3/5] GHES: Panic right after detection Borislav Petkov
2015-03-27 9:22 ` [RFC PATCH 4/5] GHES: Elliminate double-loop in the NMI handler Borislav Petkov
2015-03-27 9:22 ` [RFC PATCH 5/5] GHES: Make NMI handler have a single reader Borislav Petkov
2015-04-01 7:45 ` Jiri Kosina
2015-04-01 13:49 ` Borislav Petkov
2015-04-23 8:39 ` Jiri Kosina
2015-04-23 8:59 ` Borislav Petkov
2015-04-23 18:00 ` Luck, Tony
2015-04-27 20:23 ` Borislav Petkov
2015-04-28 14:30 ` Don Zickus
2015-04-28 14:42 ` Don Zickus
2015-04-28 14:55 ` Borislav Petkov
2015-04-28 15:35 ` Don Zickus
2015-04-28 16:22 ` Borislav Petkov
2015-04-28 18:44 ` Don Zickus
2015-05-04 15:40 ` Borislav Petkov
2015-04-27 3:16 ` Zheng, Lv
2015-04-27 8:46 ` Borislav Petkov
2015-04-28 0:44 ` Zheng, Lv
2015-04-28 2:24 ` Zheng, Lv
2015-04-28 7:38 ` Borislav Petkov [this message]
2015-04-28 13:38 ` Zheng, Lv
2015-04-28 13:59 ` Borislav Petkov
2015-04-29 0:24 ` Zheng, Lv
2015-04-29 0:49 ` Zheng, Lv
2015-04-29 8:13 ` Borislav Petkov
2015-04-30 8:05 ` Zheng, Lv
2015-04-30 8:48 ` Borislav Petkov
2015-05-02 0:34 ` Zheng, Lv
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