From: Marco Elver <elver@google.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Petr Mladek <pmladek@suse.com>,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH][next] printk: ringbuffer: support dataless records
Date: Mon, 20 Jul 2020 16:19:49 +0200 [thread overview]
Message-ID: <20200720141949.GA2471546@elver.google.com> (raw)
In-Reply-To: <20200720140111.19935-1-john.ogness@linutronix.de>
On Mon, Jul 20, 2020 at 04:07PM +0206, John Ogness wrote:
> With commit ("printk: use the lockless ringbuffer"), printk()
> started silently dropping messages without text because such
> records are not supported by the new printk ringbuffer.
>
> Add support for such records.
>
> Currently dataless records are denoted by INVALID_LPOS in order
> to recognize failed prb_reserve() calls. Change the ringbuffer
> to instead use two different identifiers (FAILED_LPOS and
> NO_LPOS) to distinguish between failed prb_reserve() records and
> successful dataless records, respectively.
>
> Fixes: ("printk: use the lockless ringbuffer")
> Fixes: https://lkml.kernel.org/r/20200718121053.GA691245@elver.google.com
> Signed-off-by: John Ogness <john.ogness@linutronix.de>
> ---
> based on next-20200720
>
> kernel/printk/printk_ringbuffer.c | 58 ++++++++++++++-----------------
> kernel/printk/printk_ringbuffer.h | 15 ++++----
> 2 files changed, 35 insertions(+), 38 deletions(-)
Thanks! Ran a couple tests and sanitizer report blank lines are back
where they're expected.
Tested-by: Marco Elver <elver@google.com>
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next prev parent reply other threads:[~2020-07-20 14:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-20 14:01 [PATCH][next] printk: ringbuffer: support dataless records John Ogness
2020-07-20 14:19 ` Marco Elver [this message]
2020-07-21 2:54 ` Sergey Senozhatsky
2020-07-21 10:30 ` John Ogness
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