From: Eric B Munson <emunson@mgebm.net>
To: David Laight <David.Laight@ACULAB.COM>
Cc: benh@kernel.crashing.org, a.p.zijlstra@chello.nl,
paulus@samba.org, mingo@elte.hu, acme@ghostprotocols.net,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
anton@samba.org, stable@kernel.org
Subject: Re: [PATCH V4] POWER: perf_event: Skip updating kernel counters if register value shrinks
Date: Wed, 27 Apr 2011 08:59:31 -0400 [thread overview]
Message-ID: <20110427125930.GB2936@mgebm.net> (raw)
In-Reply-To: <AE90C24D6B3A694183C094C60CF0A2F6D8AD03@saturn3.aculab.com>
[-- Attachment #1: Type: text/plain, Size: 232 bytes --]
On Wed, 27 Apr 2011, David Laight wrote:
> > But it isn't, and it doesn't have trouble with 2^32 - 1.
>
> what about:
> prev = 0x00000001
> val = 0xffffffff
Result is 0xfffffffe and we are fine.
>
> David
>
>
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 490 bytes --]
next prev parent reply other threads:[~2011-04-27 12:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-15 18:12 [PATCH V4] POWER: perf_event: Skip updating kernel counters if register value shrinks Eric B Munson
2011-04-27 7:40 ` David Laight
2011-04-27 12:19 ` Eric B Munson
2011-04-27 12:34 ` David Laight
2011-04-27 12:59 ` Eric B Munson [this message]
2011-04-27 13:04 ` David Laight
2011-04-27 12:42 ` David Laight
2011-04-27 13:08 ` Eric B Munson
2011-04-27 13:13 ` David Laight
2011-04-27 13:20 ` Eric B Munson
2011-04-27 13:26 ` Benjamin Herrenschmidt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110427125930.GB2936@mgebm.net \
--to=emunson@mgebm.net \
--cc=David.Laight@ACULAB.COM \
--cc=a.p.zijlstra@chello.nl \
--cc=acme@ghostprotocols.net \
--cc=anton@samba.org \
--cc=benh@kernel.crashing.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mingo@elte.hu \
--cc=paulus@samba.org \
--cc=stable@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox