linux-kernel - [PATCH 0/2] ring-buffer: Fix a race between readers and resize checks

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Message-Id: <20240517134008.24529-1-petr.pavlu@suse.com>
Date: Fri, 17 May 2024 15:40:06 +0200
From: Petr Pavlu <petr.pavlu@...e.com>
To: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Petr Pavlu <petr.pavlu@...e.com>
Subject: [PATCH 0/2] ring-buffer: Fix a race between readers and resize checks

Fix a race between a reader swapping a new reader page into the
ring-buffer from rb_get_reader_page() and the rb_check_pages() check
invoked at the end of the resize operation in ring_buffer_resize().

Note that a similar problem with rb_check_pages() being executed with
concurrent readers looks to exist for ring_buffer_subbuf_order_set()
too. I plan to tackle it in a separate series.

Petr Pavlu (2):
  ring-buffer: Correct stale comments related to non-consuming readers
  ring-buffer: Fix a race between readers and resize checks

 kernel/trace/ring_buffer.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

base-commit: ea5f6ad9ad9645733b72ab53a98e719b460d36a6
-- 
2.35.3