From: Joe Perches <joe@perches.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: John Ogness <john.ogness@linutronix.de>,
Petr Mladek <pmladek@suse.com>,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
kexec@lists.infradead.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/4] printk: store instead of processing cont parts
Date: Mon, 20 Jul 2020 20:53:52 -0700 [thread overview]
Message-ID: <b44b9b7c0f0d5ace01e56d2bac0251573ea7df17.camel@perches.com> (raw)
In-Reply-To: <CAHk-=whqiemoYRE41+qMuwQ_Qw3pn7gy2-Mso=ZDrwxQCVkncg@mail.gmail.com>
On Mon, 2020-07-20 at 11:30 -0700, Linus Torvalds wrote:
> On Sun, Jul 19, 2020 at 6:51 PM Sergey Senozhatsky
> <sergey.senozhatsky@gmail.com> wrote:
> > Do I get it right, what you are saying is - when we process a PR_CONT
> > message the cont buffer should already contain previous non-LOG_NEWLINE
> > and non-PR_CONT message, otherwise it's a bug?
>
> No.
>
> I'm saying that the code that does PR_CONT should have done *some*
> printing before, otherwise it's at the very least questionable.
>
> IOW, you can't just randomly start printing with PR_CONT, without
> having established _some_ context for it.
I believe there are at least a few cases that
_only_ use pr_cont to emit
complete lines.
For example: SEQ_printf in kernel/sched/debug.c
next prev parent reply other threads:[~2020-07-21 3:53 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-17 23:48 [PATCH 0/4] printk: reimplement LOG_CONT handling John Ogness
2020-07-17 23:48 ` [PATCH 1/4] printk: ringbuffer: support dataless records John Ogness
2020-07-20 14:49 ` John Ogness
2020-07-17 23:48 ` [PATCH 2/4] printk: store instead of processing cont parts John Ogness
2020-07-19 14:35 ` Sergey Senozhatsky
2020-07-19 18:27 ` Linus Torvalds
2020-07-20 1:50 ` Sergey Senozhatsky
2020-07-20 18:30 ` Linus Torvalds
2020-07-21 3:53 ` Joe Perches [this message]
2020-07-21 14:42 ` Sergey Senozhatsky
2020-07-21 14:57 ` John Ogness
2020-07-29 2:03 ` Sergey Senozhatsky
2020-07-21 15:40 ` Linus Torvalds
2020-07-28 2:22 ` Sergey Senozhatsky
2020-07-17 23:48 ` [PATCH 3/4] printk: process cont records during reading John Ogness
2020-07-17 23:48 ` [PATCH 4/4] ipconfig: cleanup printk usage John Ogness
2020-07-18 0:00 ` [PATCH 0/4] printk: reimplement LOG_CONT handling Linus Torvalds
2020-07-18 14:42 ` John Ogness
2020-07-18 17:42 ` Linus Torvalds
2020-08-11 16:05 ` Petr Mladek
2020-08-12 16:39 ` POC: Alternative solution: " Petr Mladek
2020-08-13 0:24 ` John Ogness
2020-08-13 5:18 ` Sergey Senozhatsky
2020-08-13 7:44 ` John Ogness
2020-08-13 8:41 ` Petr Mladek
2020-08-13 10:29 ` John Ogness
2020-08-13 11:30 ` Petr Mladek
2020-08-14 3:34 ` Sergey Senozhatsky
2020-08-14 8:16 ` John Ogness
2020-08-14 9:12 ` Petr Mladek
2020-08-13 11:54 ` Sergey Senozhatsky
2020-08-14 9:04 ` Petr Mladek
2020-08-14 22:46 ` Linus Torvalds
2020-08-14 23:52 ` Joe Perches
2020-08-15 2:33 ` Linus Torvalds
2020-08-15 3:08 ` Joe Perches
2020-08-15 9:25 ` David Laight
2020-08-15 5:41 ` Sergey Senozhatsky
2020-08-13 7:51 ` Petr Mladek
2020-08-13 7:31 ` Petr Mladek
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