linux-kernel - [PATCH 0/3] cleanup: provide and use a locking guard for nested read semaphores

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Message-Id: <20240110203215.36396-1-brgl@bgdev.pl>
Date: Wed, 10 Jan 2024 21:32:12 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>,
	Boqun Feng <boqun.feng@...il.com>
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 0/3] cleanup: provide and use a locking guard for nested read semaphores

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

This series adds cleanup infrastructure for defining locking guards with
additional arguments, then uses it to provide a guard for
down_read_nested() with RW semaphores and finally uses the new guard in
GPIOLIB.

Patch 3/3 of this series is a second attempt, this time with
lockdep-correct nesting.

The first two patches can either be picked up into the relevant
maintainer trees and I can pull an immutable tag or can be acked and go
directly through the GPIO tree.

Bartosz Golaszewski (3):
  cleanup: provide DEFINE_LOCK_GUARD_ARGS()
  locking/rwsem: provide a lock guard for down_read_nested()
  gpiolib: pin GPIO devices in place during descriptor lookup

 drivers/gpio/gpiolib.c  | 42 +++++++++++++++++++++++------------------
 include/linux/cleanup.h |  6 ++++++
 include/linux/rwsem.h   |  6 ++++++
 3 files changed, 36 insertions(+), 18 deletions(-)

-- 
2.40.1