From: Dan Malek <dan@embeddededge.com>
To: Jean-Denis Boyer <jdboyer@m5t.com>
Cc: Steffen Rumler <Steffen.Rumler@siemens.com>,
linuxppc <linuxppc-embedded@lists.linuxppc.org>
Subject: Re: Problem of concurrency in arch/ppc/8260_io/uart.c
Date: Mon, 15 Sep 2003 14:53:56 -0400 [thread overview]
Message-ID: <3F660AC4.8050003@embeddededge.com> (raw)
In-Reply-To: AB5AF73EAF23304EA1B932174137CED70303EA@m5tmail.m5t.com
Jean-Denis Boyer wrote:
> I have just tested your patch on 8260 and it fixes the problem when printk is called ...
The use of printk is strictly a debug function. If it is necessary to see
it print out pretty, then use a different I/O path for the application or
dump out the log buffer separately. Serial ports don't guarantee any
transactional operation with multiple users, printk isn't any different
although it does the bad thing of blocking interrupts while it processes
the message.
Adding this patch adds lots of interrupt latency and I would recommend
against it. It appears there is a bug that should be fixed to ensure
the proper synchronization of the BDs, but not with such large scale
blocking of interrupts.
Thanks.
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2003-09-15 18:53 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-15 16:26 Problem of concurrency in arch/ppc/8260_io/uart.c Jean-Denis Boyer
2003-09-15 18:37 ` Joakim Tjernlund
2003-09-15 18:53 ` Dan Malek [this message]
2003-09-15 20:02 ` Joakim Tjernlund
2003-09-16 12:25 ` Joakim Tjernlund
2003-09-17 9:33 ` Joakim Tjernlund
2003-09-17 13:38 ` Joakim Tjernlund
2003-09-17 14:58 ` Dan Malek
2003-09-17 15:22 ` Joakim Tjernlund
2003-09-17 16:33 ` Joakim Tjernlund
2003-09-23 8:28 ` Joakim Tjernlund
2003-09-26 16:31 ` Tom Rini
2003-09-26 18:34 ` Joakim Tjernlund
2003-09-26 18:38 ` Tom Rini
2003-09-26 21:24 ` Tom Rini
2003-09-26 22:20 ` Dan Malek
2003-09-26 22:39 ` Joakim Tjernlund
2003-09-26 23:12 ` Dan Malek
2003-09-27 8:07 ` Joakim Tjernlund
2003-09-27 13:43 ` Joakim Tjernlund
2003-09-29 15:33 ` Tom Rini
2003-09-30 15:28 ` Dan Malek
2003-10-01 14:26 ` Kumar Gala
2003-10-01 14:32 ` Tom Rini
2003-10-01 14:48 ` Gary Thomas
2003-10-01 21:20 ` Joakim Tjernlund
2003-10-01 21:32 ` Tom Rini
2003-10-01 21:51 ` Joakim Tjernlund
2003-10-01 22:00 ` Tom Rini
2003-10-01 22:17 ` Joakim Tjernlund
2003-10-01 22:31 ` Tom Rini
2003-10-01 23:23 ` Robin Gilks
2003-10-01 23:51 ` Tom Rini
2003-10-02 0:47 ` Wolfgang Denk
2003-10-02 6:03 ` Dan Kegel
2003-10-02 19:15 ` Tom Rini
[not found] <3F8E8817.5ACD7ACB@siemens.com>
2003-10-16 14:11 ` Joakim Tjernlund
-- strict thread matches above, loose matches on Subject: below --
2003-09-15 10:18 Steffen Rumler
2003-09-15 13:30 ` Joakim Tjernlund
2003-03-07 15:18 Jean-Denis Boyer
2003-03-07 12:52 Dayton, Dean
2003-03-06 21:39 Jean-Denis Boyer
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