From: Keir Fraser <keir@xen.org>
To: Olaf Hering <olaf@aepfle.de>
Cc: xen-devel@lists.xensource.com,
George Dunlap <george.dunlap@citrix.com>,
Jan Beulich <JBeulich@novell.com>
Subject: Re: [PATCH 1 of 5] xentrace: fix t_info_pages calculation for the default case
Date: Wed, 23 Mar 2011 12:33:03 +0000 [thread overview]
Message-ID: <C9AF98FF.2BC96%keir@xen.org> (raw)
In-Reply-To: <20110323112040.GB28535@aepfle.de>
On 23/03/2011 11:20, "Olaf Hering" <olaf@aepfle.de> wrote:
>>>> t_info_pages /= PAGE_SIZE;
>>>> - if ( t_info_pages % PAGE_SIZE )
>>>> + if ( t_info_pages % PAGE_SIZE || t_info_pages == 0 )
>>>
>>> While certainly not having a significant effect, to the unsuspecting
>>> reader this looks like a bug - is it really meant to be a remainder
>>> operation on the *result* of a division (rather than on the original
>>> dividend)? Couldn't you just (ab)use PFN_UP() here?
>>
>> By which you mean to replace the division and subsequent if statement with
>> t_info_pages = PFN_UP(t_info_pages).
>
> I did not know about PFN_UP() until now, using it would work as well.
As opposed to the existing code (even including your latest patch) which
doesn't work properly. You need to respin at least your patch 1/5.
-- Keir
next prev parent reply other threads:[~2011-03-23 12:33 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-22 19:21 [PATCH 0 of 5] xentrace updates Olaf Hering
2011-03-22 19:21 ` [PATCH 1 of 5] xentrace: fix t_info_pages calculation for the default case Olaf Hering
2011-03-23 10:12 ` Jan Beulich
2011-03-23 10:22 ` Keir Fraser
2011-03-23 11:20 ` Olaf Hering
2011-03-23 12:33 ` Keir Fraser [this message]
2011-03-23 12:46 ` Olaf Hering
2011-03-23 14:56 ` George Dunlap
2011-03-23 12:45 ` Jan Beulich
2011-03-23 13:16 ` Olaf Hering
2011-03-23 13:35 ` Keir Fraser
2011-03-22 19:21 ` [PATCH 2 of 5] xentrace: print calculated numbers in calculate_tbuf_size() Olaf Hering
2011-03-22 19:21 ` [PATCH 3 of 5] xentrace: remove gdprintk usage since they are not in guest context Olaf Hering
2011-03-22 19:21 ` [PATCH 4 of 5] xentrace: update comments Olaf Hering
2011-03-22 19:21 ` [PATCH 5 of 5] xentrace: use consistent printk prefix Olaf Hering
2011-03-23 10:14 ` Jan Beulich
2011-03-23 11:18 ` Olaf Hering
2011-03-23 14:47 ` George Dunlap
2011-03-23 16:20 ` Jan Beulich
2011-03-23 17:02 ` George Dunlap
2011-03-23 17:11 ` Olaf Hering
-- strict thread matches above, loose matches on Subject: below --
2011-03-23 17:54 [PATCH 0 of 5] xentrace updates Olaf Hering
2011-03-23 17:54 ` [PATCH 1 of 5] xentrace: fix t_info_pages calculation for the default case Olaf Hering
2011-03-24 12:09 ` Christoph Egger
2011-03-24 12:18 ` Christoph Egger
2011-03-24 12:34 ` Keir Fraser
2011-03-24 15:47 ` George Dunlap
2011-03-24 16:03 ` Olaf Hering
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