From: Paul Clarke <pc@us.ibm.com>
To: Heinz Wrobel <Heinz.Wrobel@freescale.com>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH] powerpc: mitigate impact of decrementer reset
Date: Wed, 08 Oct 2014 07:27:15 -0500 [thread overview]
Message-ID: <54352DA3.8090509@us.ibm.com> (raw)
In-Reply-To: <cf20308cc3b44935a604f409958b610d@BLUPR03MB167.namprd03.prod.outlook.com>
On 10/08/2014 12:37 AM, Heinz Wrobel wrote:
> what if your tb wraps during the test?
Per the Power ISA, Time Base is 64 bits, monotonically increasing, and
is writable only in hypervisor state. To my understanding, it is set to
zero at boot (although this is not prescribed).
Also, as noted by others, the logic is roughly duplicated (with some
differences) from the analogous code in __timer_interrupt just above it.
I don't see wrapping as a concern.
PC
next prev parent reply other threads:[~2014-10-08 12:27 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1412708517-84726-1-git-send-email-pc@us.ibm.com>
2014-10-07 19:13 ` [PATCH] powerpc: mitigate impact of decrementer reset Paul Clarke
2014-10-08 2:52 ` Michael Ellerman
2014-10-08 10:27 ` Preeti U Murthy
2014-11-05 17:06 ` Paul Clarke
2014-11-13 2:39 ` Michael Ellerman
2014-11-13 19:33 ` Paul Clarke
2014-10-08 5:37 ` [PATCH] " Heinz Wrobel
2014-10-08 12:27 ` Paul Clarke [this message]
2014-11-10 10:08 ` Benjamin Herrenschmidt
2014-11-10 20:58 ` Paul Clarke
2014-11-13 2:42 ` Michael Ellerman
2014-11-17 19:18 ` Paul E. McKenney
2014-11-18 1:46 ` Michael Ellerman
2014-11-18 3:08 ` Paul E. McKenney
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