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Wed, 30 Apr 2025 20:27:36 -0700 (PDT) From: Alexei Starovoitov To: bpf@vger.kernel.org, linux-mm@kvack.org Cc: vbabka@suse.cz, harry.yoo@oracle.com, shakeel.butt@linux.dev, mhocko@suse.com, bigeasy@linutronix.de, andrii@kernel.org, memxor@gmail.com, akpm@linux-foundation.org, peterz@infradead.org, rostedt@goodmis.org, hannes@cmpxchg.org, willy@infradead.org Subject: [PATCH 3/6] locking/local_lock: Introduce local_lock_is_locked(). Date: Wed, 30 Apr 2025 20:27:15 -0700 Message-Id: <20250501032718.65476-4-alexei.starovoitov@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250501032718.65476-1-alexei.starovoitov@gmail.com> References: <20250501032718.65476-1-alexei.starovoitov@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 5312BC0003 X-Stat-Signature: rgdjf8bortusa9eaxhg9t9514urimaxm X-Rspam-User: X-HE-Tag: 1746070058-976807 X-HE-Meta: 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 Cf6M/HdL 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 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: From: Alexei Starovoitov Introduce local_lock_is_locked() that returns true when given local_lock is locked by current cpu (in !PREEMPT_RT) or by current task (in PREEMPT_RT). Signed-off-by: Alexei Starovoitov --- include/linux/local_lock.h | 2 ++ include/linux/local_lock_internal.h | 8 ++++++++ 2 files changed, 10 insertions(+) diff --git a/include/linux/local_lock.h b/include/linux/local_lock.h index 16a2ee4f8310..092ce89b162a 100644 --- a/include/linux/local_lock.h +++ b/include/linux/local_lock.h @@ -66,6 +66,8 @@ */ #define local_trylock(lock) __local_trylock(lock) +#define local_lock_is_locked(lock) __local_lock_is_locked(lock) + /** * local_trylock_irqsave - Try to acquire a per CPU local lock, save and disable * interrupts if acquired diff --git a/include/linux/local_lock_internal.h b/include/linux/local_lock_internal.h index 29df45f95843..263723a45ecd 100644 --- a/include/linux/local_lock_internal.h +++ b/include/linux/local_lock_internal.h @@ -165,6 +165,9 @@ do { \ !!tl; \ }) +/* preemption or migration must be disabled before calling __local_lock_is_locked */ +#define __local_lock_is_locked(lock) READ_ONCE(this_cpu_ptr(lock)->acquired) + #define __local_lock_release(lock) \ do { \ local_trylock_t *tl; \ @@ -285,4 +288,9 @@ do { \ __local_trylock(lock); \ }) +/* migration must be disabled before calling __local_lock_is_locked */ +#include "../../kernel/locking/rtmutex_common.h" +#define __local_lock_is_locked(__lock) \ + (rt_mutex_owner(&this_cpu_ptr(__lock)->lock) == current) + #endif /* CONFIG_PREEMPT_RT */ -- 2.47.1