[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <Pine.LNX.4.44L0.1204131411010.1166-100000@iolanthe.rowland.org>
Date: Fri, 13 Apr 2012 14:13:58 -0400 (EDT)
From: Alan Stern <stern@...land.harvard.edu>
To: Johannes Stezenbach <js@...21.net>
cc: Jason Baron <jbaron@...hat.com>, <linux-kernel@...r.kernel.org>,
<linux-usb@...r.kernel.org>
Subject: Re: ehci dynamic debug problem
On Fri, 13 Apr 2012, Johannes Stezenbach wrote:
> > But there is no such thing as dynamic debug for ehci, is there?
> > There's a separate dynamic debug setting for each dev_dbg statement.
> > So your ideal solution makes no sense.
>
> When CONFIG_DYNAMIC_DEBUG=y but ehci debug is disabled
There is no such thing as ehci debug! So how can it be disabled?
There's only an individual setting for each line of debugging code.
> in /sys/kernel/debug/dynamic_debug/control, then
> dbg_port() calls dbg_port_buf() which would
> format the string, then calls ehci_dbg() which
> calls dev_dbg() which discards it.
>
> Does it make sense now?
No. What happens if dynamic debug is enabled for one line that calls
dbg_port_buf() but not for another? There's no way to avoid the string
formatting in both lines, even though one of them discards the result.
Alan Stern
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists