From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Adrian Bunk <bunk@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Josh Triplett <josh@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: 2.6.23-rc2-mm1: rcutorture xtime usage
Date: Thu, 9 Aug 2007 19:00:40 -0700 [thread overview]
Message-ID: <20070810020040.GK8424@linux.vnet.ibm.com> (raw)
In-Reply-To: <20070810013146.GD18938@stusta.de>
On Fri, Aug 10, 2007 at 03:31:46AM +0200, Adrian Bunk wrote:
> On Thu, Aug 09, 2007 at 01:51:06AM -0700, Andrew Morton wrote:
> >...
> > Changes since 2.6.23-rc2-mm1:
> >...
> > +allow-rcutorture-to-handle-synchronize_sched.patch
> >...
> > 2.6.23 queue
> >...
>
> All drivers were converted to no longer use xtime directly since it
> might be quite outdated, but this patch adds a usage of xtime.tv_nsec
> as RNG...
This code doesn't care if the time is outdated, as it is simply
periodically perturbing an RNG, but OK.
So, what interface are we supposed to be using instead? I cannot use
get_random_bytes() due to locking issues. This is not a cryptographically
secure usage, so the perturbation does not need to be extremely high
quality.
On x86, I would just grab the low-order bits of the TSC, but all of the
world is not an x86. ;-)
Thanx, Paul
next prev parent reply other threads:[~2007-08-10 2:01 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-09 8:51 2.6.23-rc2-mm1 Andrew Morton
2007-08-09 10:10 ` [usb-storage] schedule_timeout: wrong timeout value c1a95554 Mariusz Kozlowski
2007-08-09 14:43 ` [linux-usb-devel] " Alan Stern
2007-08-09 15:07 ` Rafael J. Wysocki
2007-08-09 15:20 ` Mariusz Kozlowski
2007-08-09 19:15 ` Rafael J. Wysocki
2007-08-09 12:53 ` 2.6.23-rc2-mm1 -- spinlock bad magic Andy Whitcroft
2007-08-09 17:17 ` Andy Whitcroft
2007-08-09 13:04 ` 2.6.23-rc2-mm1 -- PPC G5 kernel compile failure Andy Whitcroft
2007-08-09 14:20 ` 2.6.23-rc2-mm1 -- PPC G5 kernel compile failure (patch) Krzysztof Helt
2007-08-09 17:18 ` Andy Whitcroft
2007-08-10 13:09 ` Andy Whitcroft
2007-08-09 13:23 ` 2.6.23-rc2-mm1 Michal Piotrowski
2007-08-09 18:37 ` 2.6.23-rc2-mm1 Andrew Morton
2007-08-09 19:04 ` 2.6.23-rc2-mm1 Michal Piotrowski
2007-08-09 19:10 ` 2.6.23-rc2-mm1 Andrew Morton
2007-08-09 19:27 ` 2.6.23-rc2-mm1 Jeff Garzik
2007-08-09 13:51 ` 2.6.23-rc2-mm1: e1000e global symbols must be renamed Adrian Bunk
2007-08-09 17:06 ` [E1000-devel] " Kok, Auke
2007-08-09 14:24 ` 2.6.23-rc2-mm1: no bcm43xx Rafael J. Wysocki
2007-08-09 14:16 ` Michael Buesch
2007-08-09 15:11 ` 2.6.23-rc2-mm1: kernel BUG at mm/swap_state.c:78! Mariusz Kozlowski
2007-08-09 15:14 ` Adrian Bunk
2007-08-09 15:25 ` Mariusz Kozlowski
2007-08-09 15:37 ` Hugh Dickins
2007-08-09 16:00 ` Michal Piotrowski
2007-08-10 0:30 ` Nick Piggin
2007-08-09 15:36 ` 2.6.23-rc2-mm1 Michal Piotrowski
2007-08-09 16:19 ` 2.6.23-rc2-mm1 Michal Piotrowski
2007-08-09 17:04 ` 2.6.23-rc2-mm1 Andrew Morton
2007-08-09 16:31 ` 2.6.23-rc2-mm1 Andrew Morton
2007-08-09 20:17 ` 2.6.23-rc2-mm1: silly df numbers on 32bit extN Hugh Dickins
2007-08-09 20:56 ` Andrew Morton
2007-08-09 20:30 ` 2.6.23-rc2-mm1 Jesper Juhl
2007-08-09 21:36 ` 2.6.23-rc2-mm1 Gabriel C
2007-08-09 22:04 ` 2.6.23-rc2-mm1 Andrew Morton
2007-08-09 22:42 ` 2.6.23-rc2-mm1 Alan Cox
2007-08-09 23:33 ` 2.6.23-rc2-mm1 Gabriel C
2007-08-09 23:23 ` 2.6.23-rc2-mm1: sleeping function called from invalid context at kernel/mutex.c:86 Mariusz Kozlowski
2007-08-10 0:11 ` Andrew Morton
2007-08-10 5:36 ` Josh Triplett
2007-08-10 7:27 ` Mariusz Kozlowski
2007-08-10 7:40 ` Ingo Molnar
2007-08-10 7:55 ` Andrew Morton
2007-08-11 7:24 ` Alexey Dobriyan
2007-08-09 23:49 ` 2.6.23-rc2-mm1: rtl8139 inconsistent lock state Mariusz Kozlowski
2007-08-22 13:35 ` [PATCH 2.6.23-rc3-mm1] request_irq fix DEBUG_SHIRQ handling " Jarek Poplawski
2007-08-25 9:43 ` Mariusz Kozlowski
2007-08-27 5:54 ` Jarek Poplawski
2007-08-23 8:44 ` [PATCH (take 2)] " Jarek Poplawski
2007-08-24 5:46 ` Jarek Poplawski
2007-08-10 1:31 ` 2.6.23-rc2-mm1: rcutorture xtime usage Adrian Bunk
2007-08-10 2:00 ` Paul E. McKenney [this message]
2007-08-10 2:06 ` Andrew Morton
2007-08-10 15:12 ` Paul E. McKenney
2007-08-10 17:12 ` Andrew Morton
2007-08-10 20:30 ` Paul E. McKenney
2007-08-11 0:29 ` Paul E. McKenney
2007-08-11 4:47 ` Paul E. McKenney
2007-08-11 18:09 ` Ingo Molnar
2007-08-11 19:39 ` Paul E. McKenney
2007-08-10 2:22 ` Adrian Bunk
2007-08-10 7:06 ` 2.6.23-rc2-mm1: irq lock inversion dependency detected Mariusz Kozlowski
2007-08-24 8:27 ` Jarek Poplawski
2007-08-24 8:50 ` Jarek Poplawski
2007-08-14 21:22 ` [-mm patch] make fs/nfsd/nfs4callback.c:do_probe_callback() static Adrian Bunk
2007-08-14 22:02 ` J. Bruce Fields
2007-08-14 21:23 ` [-mm patch] make drivers/ata/libata-scsi.c:ata_scsi_link_pm_policy() static Adrian Bunk
2007-08-14 21:23 ` [-mm patch] unexport ide_acpi_set_state Adrian Bunk
2007-08-14 21:23 ` [-mm patch] drivers/mtd/mtdbdi.c is no longer an own module Adrian Bunk
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