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From: Jason Baron <jbaron@redhat.com>
To: Bart Van Assche <bvanassche@acm.org>
Cc: gregkh@suse.de, joe@perches.com, jim.cromie@gmail.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 03/11] dynamic_debug: Remove uses of KERN_CONT in dynamic_emit_prefix
Date: Fri, 15 Jul 2011 11:07:34 -0400	[thread overview]
Message-ID: <20110715150734.GA2493@redhat.com> (raw)
In-Reply-To: <CAO+b5-qQ452VojorX_p4W2orh4DKnM206TA3F5yA2fnhcPhXsQ@mail.gmail.com>

On Fri, Jul 15, 2011 at 12:04:22PM +0200, Bart Van Assche wrote:
> On Thu, Jul 14, 2011 at 6:09 PM, Jason Baron <jbaron@redhat.com> wrote:
> > +       char tid[sizeof(int) + sizeof(int)/2 + 4];
> > +       char lineno[sizeof(int) + sizeof(int)/2];
> 
> It's not clear to me where the array bounds come from ? Also, why
> sizeof(int) + sizeof(int)/2 instead of sizeof(int)*3 + 1 ?
> 
> Bart.

hmmm...for the tid it bounded by PID_MAX_LIMIT, which is 4 million, so
you need 7 characters + 3 for the brackets and space = 10. So that looks
right to me. Although I'm not sure where the sizeof() comes from? Joe?

For the lineno, it is 24 bits, so it can be 2^24 = 16,777,216, or 8
characters, so I think the 6 is incorrect. Although, in practice I don't
think we have any files that are that big. Joe?

Thanks,

-Jason

  reply	other threads:[~2011-07-15 15:07 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-14 16:09 [PATCH 00/11] various fixes v2 Jason Baron
2011-07-14 16:09 ` [PATCH 01/11] dynamic_debug: Add __dynamic_dev_dbg Jason Baron
2011-07-14 16:09 ` [PATCH 02/11] dynamic_debug: Consolidate prefix output to single routine Jason Baron
2011-07-14 16:09 ` [PATCH 03/11] dynamic_debug: Remove uses of KERN_CONT in dynamic_emit_prefix Jason Baron
2011-07-15 10:04   ` Bart Van Assche
2011-07-15 15:07     ` Jason Baron [this message]
2011-07-15 15:54       ` Joe Perches
2011-07-14 16:09 ` [PATCH 04/11] dynamic_debug: Convert printks to pr_<level> Jason Baron
2011-07-14 16:09 ` [PATCH 05/11] dynamic_debug: remove unused control variables Jason Baron
2011-07-14 16:09 ` [PATCH 06/11] dynamic_debug: add Jason Baron as maintainer Jason Baron
2011-07-14 16:09 ` [PATCH 07/11] dynamic_debug: make netdev_dbg() call __netdev_printk() Jason Baron
2011-07-14 16:09 ` [PATCH 08/11] dynamic_debug: make netif_dbg() " Jason Baron
2011-07-14 16:09 ` [PATCH 09/11] dynamic_debug: consolidate repetitive struct _ddebug descriptor definitions Jason Baron
2011-07-14 16:09 ` [PATCH 10/11] dynamic_debug: remove num_enabled accounting Jason Baron
2011-07-14 16:09 ` [PATCH 11/11] dynamic_debug: use a single printk() to emit msgs Jason Baron
2011-07-15  6:41   ` Joe Perches
2011-07-15 10:05   ` Bart Van Assche
2011-07-15 15:48     ` Joe Perches
2011-07-15 15:57       ` Bart Van Assche
2011-07-15 16:04         ` Jason Baron
2011-07-15 16:10           ` Joe Perches
2011-07-15 16:10           ` Bart Van Assche
2011-07-15 16:16             ` Joe Perches
2011-07-15 19:59               ` [PATCH 11/11 re-post] " Jason Baron
2011-07-15 23:46                 ` Joe Perches
2011-07-18 14:30                   ` Jason Baron
2011-07-18 14:50                     ` Joe Perches
2011-07-15 16:08         ` [PATCH 11/11] " Joe Perches
2011-08-11 18:36 [PATCH 00/11] various fixes v3 Jason Baron
2011-08-11 18:36 ` [PATCH 03/11] dynamic_debug: Remove uses of KERN_CONT in dynamic_emit_prefix Jason Baron

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