linux-kernel - [PATCH 0/3] printk: KUnit: Followup fixes for the new KUnit test

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Message-ID: <20250702095157.110916-1-pmladek@suse.com>
Date: Wed,  2 Jul 2025 11:51:54 +0200
From: Petr Mladek <pmladek@...e.com>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
	John Ogness <john.ogness@...utronix.de>,
	Dan Carpenter <dan.carpenter@...aro.org>
Cc: Steven Rostedt <rostedt@...dmis.org>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A . R . Silva" <gustavoars@...nel.org>,
	David Gow <davidgow@...gle.com>,
	Arnd Bergmann <arnd@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Petr Mladek <pmladek@...e.com>
Subject: [PATCH 0/3] printk: KUnit: Followup fixes for the new KUnit test

Hi,

this patchset puts together some followup fixes for the new KUnit test
which were discussed on several locations.

1st patch:

  + adds a comment exaplaing why the test ignores pr_reserve() failures.

  + was proposed at https://lore.kernel.org/r/aFUiQESkXjFIGqez@pathway.suse.cz

  + Thomas Weißschuh added into v4 of the original patch but I have already
    comitted v3 in the meantime, see
    https://lore.kernel.org/r/20250620-printk-ringbuffer-test-v4-1-8df873f1f3e0@linutronix.de


2nd patch:

  + dynamically allocates a cpu bitmap to make the code safe even on systems
    with many CPUs.

  + v1 was set by Arnd Bergmann but it had some problems, see
    https://lore.kernel.org/r/20250620192554.2234184-1-arnd@kernel.org

  + This version just integreates the proposed fixes from
    https://lore.kernel.org/r/aFkuqaFn3BOvsPT-@pathway.suse.cz


3rd patch:

  + stores "size" instead on "len" in struct prbtest_rbdata so that
    is can be used to check code sanity by __counted_by(size).

  + fixes https://lore.kernel.org/r/eaea66b9-266a-46e7-980d-33f40ad4b215@sabinyo.mountain

  + it is based on the idea from Thomas Weißschuh, see
    20250626082605-c5fbbb88-f6cc-4659-bea0-a283cdb58e81@...utronix.de


Sigh, I should have asked people to send new patches. But this looked
easier and I wanted to clean the table.


Arnd Bergmann (1):
  printk: kunit: support offstack cpumask

Petr Mladek (2):
  printk: ringbuffer: Explain why the KUnit test ignores failed writes
  printk: kunit: Fix __counted_by() in struct prbtest_rbdata

 kernel/printk/printk_ringbuffer_kunit_test.c | 78 +++++++++++++-------
 1 file changed, 52 insertions(+), 26 deletions(-)

-- 
2.50.0