linux-kernel - Re: [PATCH v2] locking/spinlocks: Make __raw

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Date: Mon, 4 Mar 2024 12:41:27 -0500
From: Waiman Long <longman@...hat.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Will Deacon <will@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
 Arnd Bergmann <arnd@...db.de>
Cc: linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
 linux-s390@...r.kernel.org
Subject: Re: [PATCH v2] locking/spinlocks: Make __raw_* lock ops static


On 3/4/24 05:56, Geert Uytterhoeven wrote:
> If CONFIG_GENERIC_LOCKBREAK=y and CONFIG_DEBUG_LOCK_ALLOC=n
> (e.g. sh/sdk7786_defconfig):
>
>      kernel/locking/spinlock.c:68:17: warning: no previous prototype for '__raw_spin_lock' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:80:26: warning: no previous prototype for '__raw_spin_lock_irqsave' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:98:17: warning: no previous prototype for '__raw_spin_lock_irq' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:103:17: warning: no previous prototype for '__raw_spin_lock_bh' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:68:17: warning: no previous prototype for '__raw_read_lock' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:80:26: warning: no previous prototype for '__raw_read_lock_irqsave' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:98:17: warning: no previous prototype for '__raw_read_lock_irq' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:103:17: warning: no previous prototype for '__raw_read_lock_bh' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:68:17: warning: no previous prototype for '__raw_write_lock' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:80:26: warning: no previous prototype for '__raw_write_lock_irqsave' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:98:17: warning: no previous prototype for '__raw_write_lock_irq' [-Wmissing-prototypes]
>      kernel/locking/spinlock.c:103:17: warning: no previous prototype for '__raw_write_lock_bh' [-Wmissing-prototypes]
>
> All __raw_* lock ops are internal functions without external callers.
> Hence fix this by making them static.
>
> Note that if CONFIG_GENERIC_LOCKBREAK=y, no lock ops are inlined, as all
> of CONFIG_INLINE_*_LOCK* depend on !GENERIC_LOCKBREAK.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Acked-by: Waiman Long <longman@...hat.com>

Thanks for updating the change log.

Cheers,
Longman

> ---
> Compile-tested on all defconfigs that have CONFIG_GENERIC_LOCKBREAK=y:
>    - sh/sdk7786_defconfig,
>    - sh/shx3_defconfig,
>    - s390/debug_defconfig,
> and also on s390/debug_defconfig after changing:
>      CONFIG_DEBUG_LOCK_ALLOC=n
>      CONFIG_DEBUG_WW_MUTEX_SLOWPATH=n
>      CONFIG_LOCK_STAT=n
>      CONFIG_PROVE_LOCKING=n
>
> v2:
>    - Add Acked-by,
>    - Drop RFC,
>    - Improve patch description.
> ---
>   kernel/locking/spinlock.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/locking/spinlock.c b/kernel/locking/spinlock.c
> index 8475a0794f8c5ad2..7009b568e6255d64 100644
> --- a/kernel/locking/spinlock.c
> +++ b/kernel/locking/spinlock.c
> @@ -65,7 +65,7 @@ EXPORT_PER_CPU_SYMBOL(__mmiowb_state);
>    * towards that other CPU that it should break the lock ASAP.
>    */
>   #define BUILD_LOCK_OPS(op, locktype)					\
> -void __lockfunc __raw_##op##_lock(locktype##_t *lock)			\
> +static void __lockfunc __raw_##op##_lock(locktype##_t *lock)		\
>   {									\
>   	for (;;) {							\
>   		preempt_disable();					\
> @@ -77,7 +77,7 @@ void __lockfunc __raw_##op##_lock(locktype##_t *lock)			\
>   	}								\
>   }									\
>   									\
> -unsigned long __lockfunc __raw_##op##_lock_irqsave(locktype##_t *lock)	\
> +static unsigned long __lockfunc __raw_##op##_lock_irqsave(locktype##_t *lock) \
>   {									\
>   	unsigned long flags;						\
>   									\
> @@ -95,12 +95,12 @@ unsigned long __lockfunc __raw_##op##_lock_irqsave(locktype##_t *lock)	\
>   	return flags;							\
>   }									\
>   									\
> -void __lockfunc __raw_##op##_lock_irq(locktype##_t *lock)		\
> +static void __lockfunc __raw_##op##_lock_irq(locktype##_t *lock)	\
>   {									\
>   	_raw_##op##_lock_irqsave(lock);					\
>   }									\
>   									\
> -void __lockfunc __raw_##op##_lock_bh(locktype##_t *lock)		\
> +static void __lockfunc __raw_##op##_lock_bh(locktype##_t *lock)		\
>   {									\
>   	unsigned long flags;						\
>   									\