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From: "H. Peter Anvin" <hpa@zytor.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>,
	Chris Metcalf <cmetcalf@tilera.com>
Cc: Jakub Jelinek <jakub@redhat.com>,
	One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
	Tony Luck <tony.luck@intel.com>,
	linux-ia64@vger.kernel.org,
	Peter Hurley <peter@hurleysoftware.com>,
	Mikael Pettersson <mikpelinux@gmail.com>,
	Oleg Nesterov <oleg@redhat.com>,
	linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
	linux-arch@vger.kernel.org, paulmck@linux.vnet.ibm.com,
	linuxppc-dev@lists.ozlabs.org, Miroslav Franc <mfranc@redhat.com>,
	Richard Henderson <rth@twiddle.net>
Subject: Re: bit fields && data tearing
Date: Mon, 08 Sep 2014 19:27:14 -0700	[thread overview]
Message-ID: <540E6582.9020403@zytor.com> (raw)
In-Reply-To: <1410216228.2027.88.camel@jarvis.lan>

On 09/08/2014 03:43 PM, James Bottomley wrote:
> 
> This was years ago (possibly decades).  We had to implement in-kernel
> unaligned traps for the networking layer because it could access short
> and int fields that weren't of the correct alignment when processing
> packets.  It that's all corrected now, we wouldn't really notice (except
> a bit of a speed up since an unaligned trap effectively places the
> broken out instructions into the bit stream).
> 
> James
> 

Well, ARM doesn't trap, it just silently gives garbage on unaligned
memory references.

	-hpa


_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev

WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>,
	Chris Metcalf <cmetcalf@tilera.com>
Cc: Peter Hurley <peter@hurleysoftware.com>,
	paulmck@linux.vnet.ibm.com,
	One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
	Jakub Jelinek <jakub@redhat.com>,
	Mikael Pettersson <mikpelinux@gmail.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Richard Henderson <rth@twiddle.net>,
	Oleg Nesterov <oleg@redhat.com>,
	Miroslav Franc <mfranc@redhat.com>,
	Paul Mackerras <paulus@samba.org>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org, Tony Luck <tony.luck@intel.com>,
	linux-ia64@vger.kernel.org
Subject: Re: bit fields && data tearing
Date: Mon, 08 Sep 2014 19:27:14 -0700	[thread overview]
Message-ID: <540E6582.9020403@zytor.com> (raw)
Message-ID: <20140909022714.7yhZoG5s2CQZASKOTQXWLJXM4vyh5ta7LAGBZ2iqRo0@z> (raw)
In-Reply-To: <1410216228.2027.88.camel@jarvis.lan>

On 09/08/2014 03:43 PM, James Bottomley wrote:
> 
> This was years ago (possibly decades).  We had to implement in-kernel
> unaligned traps for the networking layer because it could access short
> and int fields that weren't of the correct alignment when processing
> packets.  It that's all corrected now, we wouldn't really notice (except
> a bit of a speed up since an unaligned trap effectively places the
> broken out instructions into the bit stream).
> 
> James
> 

Well, ARM doesn't trap, it just silently gives garbage on unaligned
memory references.

	-hpa



WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>,
	Chris Metcalf <cmetcalf@tilera.com>
Cc: Peter Hurley <peter@hurleysoftware.com>,
	paulmck@linux.vnet.ibm.com,
	One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
	Jakub Jelinek <jakub@redhat.com>,
	Mikael Pettersson <mikpelinux@gmail.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Richard Henderson <rth@twiddle.net>,
	Oleg Nesterov <oleg@redhat.com>,
	Miroslav Franc <mfranc@redhat.com>,
	Paul Mackerras <paulus@samba.org>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org, Tony Luck <tony.luck@intel.com>,
	linux-ia64@vger.kernel.org
Subject: Re: bit fields && data tearing
Date: Tue, 09 Sep 2014 02:27:14 +0000	[thread overview]
Message-ID: <540E6582.9020403@zytor.com> (raw)
In-Reply-To: <1410216228.2027.88.camel@jarvis.lan>

On 09/08/2014 03:43 PM, James Bottomley wrote:
> 
> This was years ago (possibly decades).  We had to implement in-kernel
> unaligned traps for the networking layer because it could access short
> and int fields that weren't of the correct alignment when processing
> packets.  It that's all corrected now, we wouldn't really notice (except
> a bit of a speed up since an unaligned trap effectively places the
> broken out instructions into the bit stream).
> 
> James
> 

Well, ARM doesn't trap, it just silently gives garbage on unaligned
memory references.

	-hpa



WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>,
	Chris Metcalf <cmetcalf@tilera.com>
Cc: Jakub Jelinek <jakub@redhat.com>,
	One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
	Tony Luck <tony.luck@intel.com>,
	linux-ia64@vger.kernel.org,
	Peter Hurley <peter@hurleysoftware.com>,
	Mikael Pettersson <mikpelinux@gmail.com>,
	Oleg Nesterov <oleg@redhat.com>,
	linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
	linux-arch@vger.kernel.org, paulmck@linux.vnet.ibm.com,
	linuxppc-dev@lists.ozlabs.org, Miroslav Franc <mfranc@redhat.com>,
	Richard Henderson <rth@twiddle.net>
Subject: Re: bit fields && data tearing
Date: Mon, 08 Sep 2014 19:27:14 -0700	[thread overview]
Message-ID: <540E6582.9020403@zytor.com> (raw)
In-Reply-To: <1410216228.2027.88.camel@jarvis.lan>

On 09/08/2014 03:43 PM, James Bottomley wrote:
> 
> This was years ago (possibly decades).  We had to implement in-kernel
> unaligned traps for the networking layer because it could access short
> and int fields that weren't of the correct alignment when processing
> packets.  It that's all corrected now, we wouldn't really notice (except
> a bit of a speed up since an unaligned trap effectively places the
> broken out instructions into the bit stream).
> 
> James
> 

Well, ARM doesn't trap, it just silently gives garbage on unaligned
memory references.

	-hpa

  reply	other threads:[~2014-09-09  2:27 UTC|newest]

Thread overview: 311+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-12 18:13 bit fields && data tearing Oleg Nesterov
2014-07-12 18:13 ` Oleg Nesterov
2014-07-12 20:51 ` Oleg Nesterov
2014-07-12 20:51   ` Oleg Nesterov
2014-07-12 23:34   ` Benjamin Herrenschmidt
2014-07-12 23:34     ` Benjamin Herrenschmidt
2014-07-13 12:29     ` Oleg Nesterov
2014-07-13 12:29       ` Oleg Nesterov
2014-07-13 13:15     ` Peter Hurley
2014-07-13 13:15       ` Peter Hurley
2014-07-13 22:25       ` Benjamin Herrenschmidt
2014-07-13 22:25         ` Benjamin Herrenschmidt
2014-07-15 13:54         ` Peter Hurley
2014-07-15 13:54           ` Peter Hurley
2014-07-15 15:02           ` Richard Henderson
2014-07-15 15:02             ` Richard Henderson
2014-09-03 22:51 ` Peter Hurley
2014-09-03 22:51   ` Peter Hurley
2014-09-03 22:51   ` Peter Hurley
2014-09-03 23:11   ` Benjamin Herrenschmidt
2014-09-03 23:11     ` Benjamin Herrenschmidt
2014-09-03 23:11     ` Benjamin Herrenschmidt
2014-09-03 23:11     ` Benjamin Herrenschmidt
2014-09-04  8:43     ` David Laight
2014-09-04  8:43       ` David Laight
2014-09-04  8:43       ` David Laight
2014-09-04  8:43       ` David Laight
2014-09-04  9:52       ` Benjamin Herrenschmidt
2014-09-04  9:52         ` Benjamin Herrenschmidt
2014-09-04  9:52         ` Benjamin Herrenschmidt
2014-09-04 22:14         ` H. Peter Anvin
2014-09-04 22:14           ` H. Peter Anvin
2014-09-04 22:14           ` H. Peter Anvin
2014-09-05  0:59           ` Peter Hurley
2014-09-05  0:59             ` Peter Hurley
2014-09-05  0:59             ` Peter Hurley
2014-09-05  2:08             ` H. Peter Anvin
2014-09-05  2:08               ` H. Peter Anvin
2014-09-05  2:08               ` H. Peter Anvin
2014-09-05  8:16               ` Michael Cree
2014-09-05  8:16                 ` Michael Cree
2014-09-05  8:16                 ` Michael Cree
2014-09-05  8:16                 ` Michael Cree
2014-09-05 18:09                 ` Paul E. McKenney
2014-09-05 18:09                   ` Paul E. McKenney
2014-09-05 18:31                   ` Paul E. McKenney
2014-09-05 18:31                     ` Paul E. McKenney
2014-09-05 19:52                     ` Peter Zijlstra
2014-09-05 19:52                       ` Peter Zijlstra
2014-09-05 19:52                       ` Peter Zijlstra
2014-09-05 20:01                       ` Peter Hurley
2014-09-05 20:01                         ` Peter Hurley
2014-09-05 20:01                         ` Peter Hurley
2014-09-05 20:12                         ` Peter Zijlstra
2014-09-05 20:12                           ` Peter Zijlstra
2014-09-05 20:12                           ` Peter Zijlstra
2014-09-05 20:15                           ` H. Peter Anvin
2014-09-05 20:15                             ` H. Peter Anvin
2014-09-05 20:15                             ` H. Peter Anvin
2014-09-05 20:19                         ` Paul E. McKenney
2014-09-05 20:19                           ` Paul E. McKenney
2014-09-05 20:19                           ` Paul E. McKenney
2014-09-05 18:50                   ` Peter Hurley
2014-09-05 18:50                     ` Peter Hurley
2014-09-05 19:05                     ` Paul E. McKenney
2014-09-05 19:05                       ` Paul E. McKenney
2014-09-05 19:05                       ` Paul E. McKenney
2014-09-05 19:24                       ` Peter Hurley
2014-09-05 19:24                         ` Peter Hurley
2014-09-05 19:24                         ` Peter Hurley
2014-09-05 20:09                         ` Paul E. McKenney
2014-09-05 20:09                           ` Paul E. McKenney
2014-09-05 20:09                           ` Paul E. McKenney
2014-09-05 20:09                           ` Paul E. McKenney
2014-09-05 19:38                       ` Marc Gauthier
2014-09-05 19:38                         ` Marc Gauthier
2014-09-05 19:38                         ` Marc Gauthier
2014-09-05 20:14                         ` Peter Hurley
2014-09-05 20:14                           ` Peter Hurley
2014-09-05 20:14                           ` Peter Hurley
2014-09-05 20:34                           ` H. Peter Anvin
2014-09-05 20:34                             ` H. Peter Anvin
2014-09-05 20:34                             ` H. Peter Anvin
2014-09-05 20:42                             ` Michael Cree
2014-09-05 20:42                               ` Michael Cree
2014-09-05 20:42                               ` Michael Cree
2014-09-05 20:43                             ` Paul E. McKenney
2014-09-05 20:43                               ` Paul E. McKenney
2014-09-05 20:43                               ` Paul E. McKenney
2014-09-05 20:48                               ` Thomas Gleixner
2014-09-05 20:48                                 ` Thomas Gleixner
2014-09-05 20:48                                 ` Thomas Gleixner
2014-09-05 21:05                                 ` Paul E. McKenney
2014-09-05 21:05                                   ` Paul E. McKenney
2014-09-05 21:05                                   ` Paul E. McKenney
2014-09-05 20:39                           ` Michael Cree
2014-09-05 20:39                             ` Michael Cree
2014-09-05 20:39                             ` Michael Cree
2014-09-05 21:12                             ` Peter Hurley
2014-09-05 21:12                               ` Peter Hurley
2014-09-05 21:27                               ` Michael Cree
2014-09-05 21:27                                 ` Michael Cree
2014-09-05 21:27                                 ` Michael Cree
2014-09-05 20:42                           ` Paul E. McKenney
2014-09-05 20:42                             ` Paul E. McKenney
2014-09-05 20:42                             ` Paul E. McKenney
2014-09-05  2:08             ` H. Peter Anvin
2014-09-05  2:08               ` H. Peter Anvin
2014-09-05  2:08               ` H. Peter Anvin
2014-09-05  2:08               ` H. Peter Anvin
2014-09-05 15:31               ` Peter Hurley
2014-09-05 15:31                 ` Peter Hurley
2014-09-05 15:31                 ` Peter Hurley
2014-09-05 15:41                 ` H. Peter Anvin
2014-09-05 15:41                   ` H. Peter Anvin
2014-09-05 15:41                   ` H. Peter Anvin
2014-09-08 17:52                   ` One Thousand Gnomes
2014-09-08 17:52                     ` One Thousand Gnomes
2014-09-08 17:52                     ` One Thousand Gnomes
2014-09-08 17:59                     ` H. Peter Anvin
2014-09-08 17:59                       ` H. Peter Anvin
2014-09-08 17:59                       ` H. Peter Anvin
2014-09-08 19:17                       ` One Thousand Gnomes
2014-09-08 19:17                         ` One Thousand Gnomes
2014-09-08 19:17                         ` One Thousand Gnomes
2014-09-09 11:18                         ` Peter Hurley
2014-09-09 11:18                           ` Peter Hurley
2014-09-09 11:18                           ` Peter Hurley
2014-09-08 22:47                       ` Peter Hurley
2014-09-08 22:47                         ` Peter Hurley
2014-09-08 22:47                         ` Peter Hurley
2014-09-09  1:59                         ` Paul E. McKenney
2014-09-09  1:59                           ` Paul E. McKenney
2014-09-09  1:59                           ` Paul E. McKenney
2014-09-09 11:14                         ` Peter Hurley
2014-09-09 11:14                           ` Peter Hurley
2014-09-09 11:14                           ` Peter Hurley
2014-09-11 10:04                         ` One Thousand Gnomes
2014-09-11 10:04                           ` One Thousand Gnomes
2014-09-11 10:04                           ` One Thousand Gnomes
2014-09-11 16:16                           ` Paul E. McKenney
2014-09-11 16:16                             ` Paul E. McKenney
2014-09-11 16:16                             ` Paul E. McKenney
2014-09-11 20:01                           ` Peter Hurley
2014-09-11 20:01                             ` Peter Hurley
2014-09-11 20:01                             ` Peter Hurley
2014-09-14 23:24                             ` One Thousand Gnomes
2014-09-14 23:24                               ` One Thousand Gnomes
2014-09-14 23:24                               ` One Thousand Gnomes
2014-09-22 19:51                               ` Paul E. McKenney
2014-09-22 19:51                                 ` Paul E. McKenney
2014-09-22 19:51                                 ` Paul E. McKenney
2014-09-23 18:19                               ` Peter Hurley
2014-09-23 18:19                                 ` Peter Hurley
2014-09-23 18:19                                 ` Peter Hurley
2014-09-23 18:39                                 ` One Thousand Gnomes
2014-09-23 18:39                                   ` One Thousand Gnomes
2014-09-23 18:39                                   ` One Thousand Gnomes
2014-09-23 18:39                                   ` One Thousand Gnomes
2014-09-08 18:13                     ` James Bottomley
2014-09-08 18:13                       ` James Bottomley
2014-09-08 18:13                       ` James Bottomley
2014-09-10 20:18                     ` H. Peter Anvin
2014-09-10 20:18                       ` H. Peter Anvin
2014-09-10 20:18                       ` H. Peter Anvin
2014-09-10 21:10                       ` Rob Landley
2014-09-10 21:10                         ` Rob Landley
2014-09-10 21:10                         ` Rob Landley
2014-09-04  8:57     ` Mikael Pettersson
2014-09-04  8:57       ` Mikael Pettersson
2014-09-04  8:57       ` Mikael Pettersson
2014-09-04  8:57       ` Mikael Pettersson
2014-09-04  9:09       ` Jakub Jelinek
2014-09-04  9:09         ` Jakub Jelinek
2014-09-04  9:09         ` Jakub Jelinek
2014-09-04 12:24         ` Peter Hurley
2014-09-04 12:24           ` Peter Hurley
2014-09-04 12:24           ` Peter Hurley
2014-09-04 12:29           ` Jakub Jelinek
2014-09-04 12:29             ` Jakub Jelinek
2014-09-04 12:29             ` Jakub Jelinek
2014-09-04 16:50           ` One Thousand Gnomes
2014-09-04 16:50             ` One Thousand Gnomes
2014-09-04 16:50             ` One Thousand Gnomes
2014-09-04 16:50             ` One Thousand Gnomes
2014-09-04 19:42             ` Peter Hurley
2014-09-04 19:42               ` Peter Hurley
2014-09-04 19:42               ` Peter Hurley
2014-09-04 22:16               ` H. Peter Anvin
2014-09-04 22:16                 ` H. Peter Anvin
2014-09-04 22:16                 ` H. Peter Anvin
2014-09-05  0:17                 ` Paul E. McKenney
2014-09-05  0:17                   ` Paul E. McKenney
2014-09-05  0:17                   ` Paul E. McKenney
2014-09-05  1:57                   ` Peter Hurley
2014-09-05  1:57                     ` Peter Hurley
2014-09-05  1:57                     ` Peter Hurley
2014-09-05  2:11                   ` James Bottomley
2014-09-05  2:11                     ` James Bottomley
2014-09-05  2:11                     ` James Bottomley
2014-09-05  2:47                     ` Peter Hurley
2014-09-05  2:47                       ` Peter Hurley
2014-09-05  2:47                       ` Peter Hurley
2014-09-05  4:06                       ` Paul E. McKenney
2014-09-05  4:06                         ` Paul E. McKenney
2014-09-05  4:06                         ` Paul E. McKenney
2014-09-05  8:30                         ` David Laight
2014-09-05  8:30                           ` David Laight
2014-09-05  8:30                           ` David Laight
2014-09-05  8:30                           ` David Laight
2014-09-05 12:31                           ` Peter Hurley
2014-09-05 12:31                             ` Peter Hurley
2014-09-05 12:31                             ` Peter Hurley
2014-09-05 12:37                             ` David Laight
2014-09-05 12:37                               ` David Laight
2014-09-05 12:37                               ` David Laight
2014-09-05 12:37                               ` David Laight
2014-09-05 16:17                               ` Peter Hurley
2014-09-05 16:17                                 ` Peter Hurley
2014-09-05 16:17                                 ` Peter Hurley
2014-09-25 16:12                                 ` Pavel Machek
2014-09-25 16:12                                   ` Pavel Machek
2014-09-25 16:12                                   ` Pavel Machek
2014-09-07  5:07                         ` James Bottomley
2014-09-07  5:07                           ` James Bottomley
2014-09-07  5:07                           ` James Bottomley
2014-09-07 16:21                           ` Paul E. McKenney
2014-09-07 16:21                             ` Paul E. McKenney
2014-09-07 16:21                             ` Paul E. McKenney
2014-09-07 19:04                             ` James Bottomley
2014-09-07 19:04                               ` James Bottomley
2014-09-07 19:04                               ` James Bottomley
2014-09-07 20:41                               ` Peter Hurley
2014-09-07 20:41                                 ` Peter Hurley
2014-09-07 20:41                                 ` Peter Hurley
2014-09-08  5:50                                 ` James Bottomley
2014-09-08  5:50                                   ` James Bottomley
2014-09-08  5:50                                   ` James Bottomley
2014-09-08 20:45                                   ` Chris Metcalf
2014-09-08 20:45                                     ` Chris Metcalf
2014-09-08 20:45                                     ` Chris Metcalf
2014-09-08 20:45                                     ` Chris Metcalf
2014-09-08 22:43                                     ` James Bottomley
2014-09-08 22:43                                       ` James Bottomley
2014-09-08 22:43                                       ` James Bottomley
2014-09-09  2:27                                       ` H. Peter Anvin [this message]
2014-09-09  2:27                                         ` H. Peter Anvin
2014-09-09  2:27                                         ` H. Peter Anvin
2014-09-09  2:27                                         ` H. Peter Anvin
2014-09-09  8:11                                         ` Arnd Bergmann
2014-09-09  8:11                                           ` Arnd Bergmann
2014-09-09  8:11                                           ` Arnd Bergmann
2014-09-08 23:30                                   ` Peter Hurley
2014-09-08 23:30                                     ` Peter Hurley
2014-09-08 23:30                                     ` Peter Hurley
2014-09-09  2:56                                     ` James Bottomley
2014-09-09  2:56                                       ` James Bottomley
2014-09-09  2:56                                       ` James Bottomley
2014-09-09  3:20                                       ` H. Peter Anvin
2014-09-09  3:20                                         ` H. Peter Anvin
2014-09-09  3:20                                         ` H. Peter Anvin
2014-09-09  4:30                                       ` H. Peter Anvin
2014-09-09  4:30                                         ` H. Peter Anvin
2014-09-09  4:30                                         ` H. Peter Anvin
2014-09-09  4:30                                         ` H. Peter Anvin
2014-09-09 10:40                                       ` Peter Hurley
2014-09-09 10:40                                         ` Peter Hurley
2014-09-09 10:40                                         ` Peter Hurley
2014-09-10 21:48                                         ` James Bottomley
2014-09-10 21:48                                           ` James Bottomley
2014-09-10 21:48                                           ` James Bottomley
2014-09-10 23:50                                           ` Peter Hurley
2014-09-10 23:50                                             ` Peter Hurley
2014-09-10 23:50                                             ` Peter Hurley
2014-09-11 10:23                                           ` Will Deacon
2014-09-11 10:23                                             ` Will Deacon
2014-09-11 10:23                                             ` Will Deacon
2014-09-07 23:00                               ` Paul E. McKenney
2014-09-07 23:00                                 ` Paul E. McKenney
2014-09-07 23:00                                 ` Paul E. McKenney
2014-09-07 23:17                                 ` H. Peter Anvin
2014-09-07 23:17                                   ` H. Peter Anvin
2014-09-07 23:17                                   ` H. Peter Anvin
2014-09-07 23:36                                   ` Paul E. McKenney
2014-09-07 23:36                                     ` Paul E. McKenney
2014-09-07 23:36                                     ` Paul E. McKenney
2014-09-07 23:39                                     ` H. Peter Anvin
2014-09-07 23:39                                       ` H. Peter Anvin
2014-09-07 23:39                                       ` H. Peter Anvin
2014-09-08  5:56                                       ` James Bottomley
2014-09-08  5:56                                         ` James Bottomley
2014-09-08  5:56                                         ` James Bottomley
2014-09-08 18:12                                         ` H. Peter Anvin
2014-09-08 18:12                                           ` H. Peter Anvin
2014-09-08 18:12                                           ` H. Peter Anvin
2014-09-08 19:09                                           ` James Bottomley
2014-09-08 19:09                                             ` James Bottomley
2014-09-08 19:09                                             ` James Bottomley
2014-09-08 19:12                                             ` H. Peter Anvin
2014-09-08 19:12                                               ` H. Peter Anvin
2014-09-08 19:12                                               ` H. Peter Anvin
2014-09-08 19:12                                               ` H. Peter Anvin
2014-09-08 22:39                                               ` James Bottomley
2014-09-08 22:39                                                 ` James Bottomley
2014-09-08 22:39                                                 ` James Bottomley
2014-09-09  2:30                                                 ` H. Peter Anvin
2014-09-09  2:30                                                   ` H. Peter Anvin
2014-09-09  2:30                                                   ` H. Peter Anvin
2014-09-08 19:12                                             ` H. Peter Anvin
2014-09-08 19:12                                               ` H. Peter Anvin
2014-09-08 19:12                                               ` H. Peter Anvin

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