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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: H4sIAAAAAAAAAzWSfVDLcRzH+/6etnaNn8X5kcPtPIbIhc8fOOfO+f3jjnOO4w/Gfmc7tdxi lYcTNaLJiuVqclPXT9piNo89XXJNSSx1WWnNyNT1dOhBLNnCf6/7fN6v9+efjxCXuMjZQqXq GKdWyWKllIgQ9YfdWiGJ6VSs+qSbD61nqwkYHkon4MY9CwXptlwSnHfNCDzD6QhGfxlxGBp7 L4CJSgeCnKZsHL5bf1Ng8HZRMMjrEPTUboV+TzkJE+4vGLwb6UPAd/3G4LrBiaDbegHBA0cn guauKdAyPEhBvSGDgv6mGxgMWCkwnaskISffRkBHTjYGHt5HQIO+IKD3UJBzfyYYr3djMMaX COBVYQcBxsZmEj4W5wnA742GCVM8OMxfBOC+YiCgvrOVhF5fNgWeF+dJsLXVIsi92UFBRWU9 AenjQwgcTz5ioLM+JKHTMkFCinGUhLdmZ+Cmo46AN2WlJBS9a8LA+8FFgr3xFQ4jmRHgzLpM 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1759392848-113477 X-HE-Meta: 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 KKozKS2n a0ZlGayAJS1YsEut/YElEmep1oRNwvdn6JOtQk4YLaqIvFYaqMK7Ch0C4SWUQKGxgOQYJKADHeH+SbhuHIIyVn2toniA7T30X4+knXNMDSHPt9KpN9HLB/82tBejcrd6pPsae X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.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 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, 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