Message ID | 20230803220202.78036-6-robdclark@gmail.com |
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State | New |
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Wysocki" <rafael@kernel.org>, Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, linux-pm@vger.kernel.org (open list:SUSPEND TO RAM), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 5/9] PM / QoS: Teach lockdep about dev_pm_qos_mtx locking order Date: Thu, 3 Aug 2023 15:01:53 -0700 Message-ID: <20230803220202.78036-6-robdclark@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230803220202.78036-1-robdclark@gmail.com> References: <20230803220202.78036-1-robdclark@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: <linux-kernel.vger.kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773257069059437949 X-GMAIL-MSGID: 1773257069059437949 |
Series |
drm/msm+PM+icc: Make job_run() reclaim-safe
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Commit Message
Rob Clark
Aug. 3, 2023, 10:01 p.m. UTC
From: Rob Clark <robdclark@chromium.org> Annotate dev_pm_qos_mtx to teach lockdep to scream about allocations that could trigger reclaim under dev_pm_qos_mtx. Signed-off-by: Rob Clark <robdclark@chromium.org> --- drivers/base/power/qos.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 4537d93ddb45..6cb4143d1090 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -1010,3 +1010,14 @@ void dev_pm_qos_hide_latency_tolerance(struct device *dev) pm_runtime_put(dev); } EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_tolerance); + +static int __init dev_pm_qos_init(void) +{ + /* Teach lockdep about lock ordering wrt. shrinker: */ + fs_reclaim_acquire(GFP_KERNEL); + might_lock(&dev_pm_qos_mtx); + fs_reclaim_release(GFP_KERNEL); + + return 0; +} +early_initcall(dev_pm_qos_init);