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alex.gaynor@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, rust-for-linux@vger.kernel.org Subject: [PATCH v19 24/40] locking/lockdep: prevent various lockdep assertions when lockdep_off()'ed Date: Mon, 6 Jul 2026 15:19:12 +0900 Message-Id: <20260706061928.66713-25-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260706061928.66713-1-byungchul@sk.com> References: <20260706061928.66713-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSbUxTdxTG97/3f1/a0ezasXHVD5gmqCPBuUXnyeIW4mK4ypaZ+fJhGKXa m7UIhbSKssWsIJ0VRREHBOqQF9M05UVsgwixruLAF0LoVkzaorYQrJAGMR3FICC2GL+c/PI8 z3mSkxyWlPupVaxGe1TUaZW5ClqKpVMJjWl4R2bOxif1EjAZf4fHgXEKojMmDIvmLgZM9loK 3O0tCIzdSzGtsp+BmbkRBrzuv0n4v+MNDeG7EQRVo+M01EwWY5i2nEMw2ZcB467TCBarj0C4 +iUN84NDJNRUuRFEJoMInNYSGp5VdJIwHJ2m4UHVWRqm/r1MQMjvJOBU8zUauoM9DAQsIQwD FU1ErJyG6utJYK45RcTGBAEWQwqYBz0UjFnrGFhqyIf+lucMhEOVNATu/UFBlyHIgN3Xh2Bm 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linux-modules@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 60b17a2ff555..5113b7053b62 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -303,6 +303,7 @@ extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie); lockdep_assert_once(!current->lockdep_depth) #define lockdep_recursing(tsk) ((tsk)->lockdep_recursion) +extern bool lockdep_recursing_current(void); #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); -#define __lockdep_enabled (debug_locks && !this_cpu_read(lockdep_recursion)) +#define __lockdep_enabled (debug_locks && !this_cpu_read(lockdep_recursion) && !lockdep_recursing_current()) #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); -- 2.17.1