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[46.138.41.28]) by smtp.gmail.com with ESMTPSA id d7sm104336ljl.18.2021.10.27.14.17.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Oct 2021 14:17:57 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Lee Jones , "Rafael J . Wysocki" , Mark Brown , Andrew Morton , Guenter Roeck , Russell King , Daniel Lezcano , Andy Shevchenko , Ulf Hansson Subject: [PATCH v2 03/45] notifier: Add atomic/blocking_notifier_has_unique_priority() Date: Thu, 28 Oct 2021 00:16:33 +0300 Message-Id: <20211027211715.12671-4-digetx@gmail.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211027211715.12671-1-digetx@gmail.com> References: <20211027211715.12671-1-digetx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Thu, 28 Oct 2021 09:51:48 +1100 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rich Felker , linux-ia64@vger.kernel.org, Tomer Maimon , Santosh Shilimkar , linux-sh@vger.kernel.org, Boris Ostrovsky , Linus Walleij , Dave Hansen , linux-acpi@vger.kernel.org, Tali Perry , "James E.J. Bottomley" , Paul Mackerras , Pavel Machek , "H. Peter Anvin" , linux-riscv@lists.infradead.org, Vincent Chen , Will Deacon , Greg Ungerer , Stefano Stabellini , Benjamin Fair , Yoshinori Sato , Krzysztof Kozlowski , Helge Deller , x86@kernel.org, linux-csky@vger.kernel.org, Tony Lindgren , Chen-Yu Tsai , Ingo Molnar , Geert Uytterhoeven , Catalin Marinas , xen-devel@lists.xenproject.org, linux-mips@vger.kernel.org, Len Brown , Albert Ou , linux-pm@vger.kernel.org, =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= , Vladimir Zapolskiy , linux-m68k@lists.linux-m68k.org, Borislav Petkov , Greentime Hu , Paul Walmsley , linux-tegra@vger.kernel.org, Thomas Gleixner , linux-omap@vger.kernel.org, Nancy Yuen , linux-arm-kernel@lists.infradead.org, Juergen Gross , Thomas Bogendoerfer , linux-parisc@vger.kernel.org, Nick Hu , Avi Fishman , Patrick Venture , Liam Girdwood , linux-kernel@vger.kernel.org, Palmer Dabbelt , Philipp Zabel , Guo Ren , linuxppc-dev@lists.ozlabs.org, openbmc@lists.ozlabs.org, Joshua Thompson Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Add atomic/blocking_notifier_has_unique_priority() helpers which return true if given handler has unique priority. Signed-off-by: Dmitry Osipenko --- include/linux/notifier.h | 5 +++ kernel/notifier.c | 74 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 79 insertions(+) diff --git a/include/linux/notifier.h b/include/linux/notifier.h index 054271e9cb20..b782ce100022 100644 --- a/include/linux/notifier.h +++ b/include/linux/notifier.h @@ -175,6 +175,11 @@ int raw_notifier_call_chain_robust(struct raw_notifier_head *nh, bool blocking_notifier_call_chain_empty(struct blocking_notifier_head *nh); +bool atomic_notifier_has_unique_priority(struct atomic_notifier_head *nh, + struct notifier_block *nb); +bool blocking_notifier_has_unique_priority(struct blocking_notifier_head *nh, + struct notifier_block *nb); + #define NOTIFY_DONE 0x0000 /* Don't care */ #define NOTIFY_OK 0x0001 /* Suits me */ #define NOTIFY_STOP_MASK 0x8000 /* Don't call further */ diff --git a/kernel/notifier.c b/kernel/notifier.c index 1f7ba8988b90..cf0e1c4bd364 100644 --- a/kernel/notifier.c +++ b/kernel/notifier.c @@ -203,6 +203,40 @@ int atomic_notifier_call_chain(struct atomic_notifier_head *nh, EXPORT_SYMBOL_GPL(atomic_notifier_call_chain); NOKPROBE_SYMBOL(atomic_notifier_call_chain); +/** + * atomic_notifier_has_unique_priority - Checks whether notifier's priority is unique + * @nh: Pointer to head of the atomic notifier chain + * @n: Entry in notifier chain to check + * + * Checks whether there is another notifier in the chain with the same priority. + * Must be called in process context. + * + * Returns true if priority is unique, false otherwise. + */ +bool atomic_notifier_has_unique_priority(struct atomic_notifier_head *nh, + struct notifier_block *n) +{ + struct notifier_block **nl = &nh->head; + unsigned long flags; + bool ret = true; + + spin_lock_irqsave(&nh->lock, flags); + + while ((*nl) != NULL && (*nl)->priority >= n->priority) { + if ((*nl)->priority == n->priority && (*nl) != n) { + ret = false; + break; + } + + nl = &((*nl)->next); + } + + spin_unlock_irqrestore(&nh->lock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(atomic_notifier_has_unique_priority); + /* * Blocking notifier chain routines. All access to the chain is * synchronized by an rwsem. @@ -336,6 +370,46 @@ bool blocking_notifier_call_chain_empty(struct blocking_notifier_head *nh) } EXPORT_SYMBOL_GPL(blocking_notifier_call_chain_empty); +/** + * blocking_notifier_has_unique_priority - Checks whether notifier's priority is unique + * @nh: Pointer to head of the blocking notifier chain + * @n: Entry in notifier chain to check + * + * Checks whether there is another notifier in the chain with the same priority. + * Must be called in process context. + * + * Returns true if priority is unique, false otherwise. + */ +bool blocking_notifier_has_unique_priority(struct blocking_notifier_head *nh, + struct notifier_block *n) +{ + struct notifier_block **nl = &nh->head; + bool ret = true; + + /* + * This code gets used during boot-up, when task switching is + * not yet working and interrupts must remain disabled. At + * such times we must not call down_write(). + */ + if (system_state != SYSTEM_BOOTING) + down_write(&nh->rwsem); + + while ((*nl) != NULL && (*nl)->priority >= n->priority) { + if ((*nl)->priority == n->priority && (*nl) != n) { + ret = false; + break; + } + + nl = &((*nl)->next); + } + + if (system_state != SYSTEM_BOOTING) + up_write(&nh->rwsem); + + return ret; +} +EXPORT_SYMBOL_GPL(blocking_notifier_has_unique_priority); + /* * Raw notifier chain routines. There is no protection; * the caller must provide it. Use at your own risk! -- 2.33.1