linux-kernel - Re: [PATCH v5 17/36] locking/rwsem: Support Clang's context analysis

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Message-ID: <81d2defc-8980-4022-a464-3d285aff199c@acm.org>
Date: Fri, 19 Dec 2025 12:55:01 -0800
From: Bart Van Assche <bvanassche@....org>
To: Marco Elver <elver@...gle.com>, Peter Zijlstra <peterz@...radead.org>,
 Boqun Feng <boqun.feng@...il.com>, Ingo Molnar <mingo@...nel.org>,
 Will Deacon <will@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
 Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
 Chris Li <sparse@...isli.org>, "Paul E. McKenney" <paulmck@...nel.org>,
 Alexander Potapenko <glider@...gle.com>, Arnd Bergmann <arnd@...db.de>,
 Christoph Hellwig <hch@....de>, Dmitry Vyukov <dvyukov@...gle.com>,
 Eric Dumazet <edumazet@...gle.com>, Frederic Weisbecker
 <frederic@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
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Subject: Re: [PATCH v5 17/36] locking/rwsem: Support Clang's context analysis

On 12/19/25 7:40 AM, Marco Elver wrote:
>   static inline void rwsem_assert_held_nolockdep(const struct rw_semaphore *sem)
> +	__assumes_ctx_lock(sem)
>   {
>   	WARN_ON(atomic_long_read(&sem->count) == RWSEM_UNLOCKED_VALUE);
>   }
>   
>   static inline void rwsem_assert_held_write_nolockdep(const struct rw_semaphore *sem)
> +	__assumes_ctx_lock(sem)
>   {
>   	WARN_ON(!(atomic_long_read(&sem->count) & RWSEM_WRITER_LOCKED));
>   }
> @@ -119,6 +121,7 @@ do {								\
>   	static struct lock_class_key __key;			\
>   								\
>   	__init_rwsem((sem), #sem, &__key);			\
> +	__assume_ctx_lock(sem);					\
>   } while (0)

Just like as for lockdep.h, I think that the above annotations should be 
changed into __must_hold().

Thanks,

Bart.