From: Petr Mladek <pmladek@suse.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] printk: kmsg_dump: revert msg_print_text() workaround
Date: Thu, 14 Jan 2021 16:49:50 +0100 [thread overview]
Message-ID: <YABoHgNunkcfBElL@alley> (raw)
In-Reply-To: <20210114090511.17784-1-john.ogness@linutronix.de>
On Thu 2021-01-14 10:11:11, John Ogness wrote:
> The old msg_print_text() function only filled up to size-1 bytes of
> the buffer. A workaround for this quirky behavior was implemented
> with commit c9dccacfccc7 ("printk: Do not lose last line in kmsg
> buffer dump").
>
> However, with commit 896fbe20b4e2 ("printk: use the lockless
> ringbuffer"), msg_print_text() was replaced by,
> which will fill the full buffer. Therefore, the workaround is now
> incorrectly assuming less data can fit into the buffer. Revert the
> workaround.
We should make record_print_text() behave the same as msg_print_text()
behaved. There might be more users affected by this change and even
in userspace :-(
Let's discuss it in the other thread
https://lore.kernel.org/lkml/87im8038v7.fsf@jogness.linutronix.de/
Best Regards,
Petr
prev parent reply other threads:[~2021-01-14 15:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-14 9:05 John Ogness
2021-01-14 15:49 ` Petr Mladek [this message]
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