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ast@kernel.org, ziy@nvidia.com, yuzhao@google.com, baolin.wang@linux.alibaba.com, usamaarif642@gmail.com, joel.granados@kernel.org, richard.weiyang@gmail.com, geert+renesas@glider.be, tim.c.chen@linux.intel.com, linux@treblig.org, alexander.shishkin@linux.intel.com, lillian@star-ark.net, chenhuacai@kernel.org, francesco@valla.it, guoweikang.kernel@gmail.com, link@vivo.com, jpoimboe@kernel.org, masahiroy@kernel.org, brauner@kernel.org, thomas.weissschuh@linutronix.de, oleg@redhat.com, mjguzik@gmail.com, andrii@kernel.org, wangfushuai@baidu.com, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-i2c@vger.kernel.org, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, rcu@vger.kernel.org, linux-nfs@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: [PATCH v17 27/47] locking/lockdep: prevent various lockdep assertions when lockdep_off()'ed Date: Thu, 2 Oct 2025 17:12:27 +0900 Message-Id: <20251002081247.51255-28-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20251002081247.51255-1-byungchul@sk.com> References: <20251002081247.51255-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSa1CMYRTHe97r7rLjtcKrzGTWhJFymTJnMJgxpueDTOELZmjHvmNXtZpN qWZiVxe5NRWRVrpn1SY2ly4iXQwim8sq2tREqSwzpdBFdjO+/eac//93vhwRKTtLu4nUmiOC VqMIlTMSSmKfme8t8+1UrRrI4SGxaoqCyfTHLJhu6wkYbBhCcKlfT0FWr4GFT3UnEUxeDIGc /AoGxl+8JCGv20ZCrfEEA59T75CQbUhHEF9QzkBVVzULrYMTBJSaA8BwKZ6AjLIaAop1nnDD /pKGe7ouFn686SbAdLaXhOTqEQrMPVYaat97QV5SIQWvq68wYKlrpqG8r42Ap1nXKdA/KqAg afgPDUmFtwgoMtppeGYbZuH8q1wGMiaSGTDoUxAkN46ScKfpJwv64Y8IEjr8YPyXQ1c2aUVg aOpkN6/CpqsmhMfH0hFu+PqdxGMjbxlcO5pL4bQX3rgqy8biXHMkTmi007jCuBwX3O8ncN7Q CI3NJacY3GG9z+CH2SYWVxQeD3TfI9mgFELVUYJ25cZgiUqfaKfC22dHP6sbRDpUPOs0Eot4 zpePHyim/rOlt4VwMsMt5dvafpNOduUW8RXnemknk1zzQt7ausLJczgl/+DM4HSe4jz5jIka 1slSbi3/QFfG/nN68KU366Y9Ysf8dXfz9C0Z58cnfk9wdCWOjEHMW1L6iX+FBfwjYxuViqS5 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63RT3G/fe4prHi8nuI4KliuyruQaSxw0l9/ymd4fd1i4OYlXKdN5deyWBKEiRztMnPq0IKOj dQhlI/P8QhQiYJl1bNfAayzIFBPFfvw4iQc5jIlg6y8PkEHGmc6lbI8tJsgLmSS25eLQXz/B SFmDv4kOsojZwLZk36f/ZS5nq+ta/+aEBO7dzk4iyGJmPav15GM6JCxHc6pQmDI1PUWmVK1f pUlWZKYqM1YdT0uxoMA3mbP8RU+Qt3tHG2IESDJPZJM6FGJSlq7JTGlDrACXhIkSKu0KsShJ lnmeV6cdU59V8Zo2tERASMJFuw7xCWJGLjvDJ/P8KV79X8UEIYuz0dr+I0cfbrX74z06edhI TOiYceO4PDdKXjg6o9cXvhYljpSmOYWVB2pN8e4G6bLrDd7Efct2WkczX13LkL7YHjehEj77 5iuMihTFDmqje8LfFmfN9Z8Yc9uLxLBaXpa+7aQg3rXb6rWsOHj6nHhXmTA69C552JL1LjLi Q4SkbUZCaBSyNdG4WiP7A0laOYtJAwAA X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" lockdep provides APIs for assertion only if lockdep is enabled at the moment asserting to avoid unnecessary confusion, using the following condition, debug_locks && !this_cpu_read(lockdep_recursion). However, lockdep_{off,on}() are also used for disabling and enabling lockdep for a simular purpose. Add !lockdep_recursing(current) that is updated by lockdep_{off,on}() to the condition so that the assertions are aware of !__lockdep_enabled if lockdep_off()'ed. Signed-off-by: Byungchul Park --- include/linux/lockdep.h | 3 ++- kernel/locking/lockdep.c | 10 ++++++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index ef03d8808c10..c83fe95199db 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -303,6 +303,7 @@ extern void lock_unpin_lock(struct lockdep_map *lock, s= truct pin_cookie); lockdep_assert_once(!current->lockdep_depth) =20 #define lockdep_recursing(tsk) ((tsk)->lockdep_recursion) +extern bool lockdep_recursing_current(void); =20 #define lockdep_pin_lock(l) lock_pin_lock(&(l)->dep_map) #define lockdep_repin_lock(l,c) lock_repin_lock(&(l)->dep_map, (c)) @@ -630,7 +631,7 @@ DECLARE_PER_CPU(int, hardirqs_enabled); DECLARE_PER_CPU(int, hardirq_context); DECLARE_PER_CPU(unsigned int, lockdep_recursion); =20 -#define __lockdep_enabled (debug_locks && !this_cpu_read(lockdep_recursion= )) +#define __lockdep_enabled (debug_locks && !this_cpu_read(lockdep_recursion= ) && !lockdep_recursing_current()) =20 #define lockdep_assert_irqs_enabled() \ do { \ diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index dc97f2753ef8..39b9e3e27c0b 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -6900,3 +6900,13 @@ void lockdep_rcu_suspicious(const char *file, const = int line, const char *s) warn_rcu_exit(rcu); } EXPORT_SYMBOL_GPL(lockdep_rcu_suspicious); + +/* + * For avoiding header dependency when using (struct task_struct *)current + * and lockdep_recursing() at the same time. + */ +noinstr bool lockdep_recursing_current(void) +{ + return lockdep_recursing(current); +} +EXPORT_SYMBOL_GPL(lockdep_recursing_current); --=20 2.17.1