linux-kernel - [PATCH v2 0/2] printk_ringbuffer: don't needlessly wrap data blocks around

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Message-Id: <20250905144152.9137-1-d-tatianin@yandex-team.ru>
Date: Fri,  5 Sep 2025 17:41:50 +0300
From: Daniil Tatianin <d-tatianin@...dex-team.ru>
To: Petr Mladek <pmladek@...e.com>
Cc: Daniil Tatianin <d-tatianin@...dex-team.ru>,
	linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCH v2 0/2] printk_ringbuffer: don't needlessly wrap data blocks around

This series fixes the issue where data blocks would wrap in cases where the last
data block perfectly fits the ring. This caused whatever was at the beginning of
the ring to get discarded in this case, and the data block would get put there
even though it could be put at the end of the data ring just fine without
discarding anything.

Fixing this issue also allows to simplify the check in data_check_size,
previously it would ensure there's space for a trailing id, which we
don't need anymore.

v0->v1:
- Fix severely broken code alignment

v1->v2:
- Rename & invert get_next_lpos -> is_blk_wrapped
- Add a new commit for changing the logic in data_check_size

Daniil Tatianin (2):
  printk_ringbuffer: don't needlessly wrap data blocks around
  printk_ringbuffer: allow one data block to occupy the entire data ring

 kernel/printk/printk_ringbuffer.c | 38 +++++++++++++++++--------------
 1 file changed, 21 insertions(+), 17 deletions(-)

-- 
2.43.0