[RFC RESEND v10 14/14] locking: Switch to _irq_{disable,enable}() variants in cleanup guards

[RFC RESEND v10 14/14] locking: Switch to _irq_{disable,enable}() variants in cleanup guards

[Lyude Paul]

From: Boqun Feng <boqun.feng@gmail.com>

The semantics of various irq disabling guards match what
*_irq_{disable,enable}() provide, i.e. the interrupt disabling is
properly nested, therefore it's OK to switch to use
*_irq_{disable,enable}() primitives.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>

---
V10:
* Add PREEMPT_RT build fix from Guangbo Cui

Signed-off-by: Lyude Paul <lyude@redhat.com>
---
 include/linux/spinlock.h    | 26 ++++++++++++--------------
 include/linux/spinlock_rt.h |  6 ++++++
 2 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index b21da4bd51a42..7ff11c893940b 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -605,10 +605,10 @@ DEFINE_LOCK_GUARD_1(raw_spinlock_nested, raw_spinlock_t,
 		    raw_spin_unlock(_T->lock))
 
 DEFINE_LOCK_GUARD_1(raw_spinlock_irq, raw_spinlock_t,
-		    raw_spin_lock_irq(_T->lock),
-		    raw_spin_unlock_irq(_T->lock))
+		    raw_spin_lock_irq_disable(_T->lock),
+		    raw_spin_unlock_irq_enable(_T->lock))
 
-DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irq, _try, raw_spin_trylock_irq(_T->lock))
+DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irq, _try, raw_spin_trylock_irq_disable(_T->lock))
 
 DEFINE_LOCK_GUARD_1(raw_spinlock_bh, raw_spinlock_t,
 		    raw_spin_lock_bh(_T->lock),
@@ -617,12 +617,11 @@ DEFINE_LOCK_GUARD_1(raw_spinlock_bh, raw_spinlock_t,
 DEFINE_LOCK_GUARD_1_COND(raw_spinlock_bh, _try, raw_spin_trylock_bh(_T->lock))
 
 DEFINE_LOCK_GUARD_1(raw_spinlock_irqsave, raw_spinlock_t,
-		    raw_spin_lock_irqsave(_T->lock, _T->flags),
-		    raw_spin_unlock_irqrestore(_T->lock, _T->flags),
-		    unsigned long flags)
+		    raw_spin_lock_irq_disable(_T->lock),
+		    raw_spin_unlock_irq_enable(_T->lock))
 
 DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irqsave, _try,
-			 raw_spin_trylock_irqsave(_T->lock, _T->flags))
+			 raw_spin_trylock_irq_disable(_T->lock))
 
 DEFINE_LOCK_GUARD_1(spinlock, spinlock_t,
 		    spin_lock(_T->lock),
@@ -631,11 +630,11 @@ DEFINE_LOCK_GUARD_1(spinlock, spinlock_t,
 DEFINE_LOCK_GUARD_1_COND(spinlock, _try, spin_trylock(_T->lock))
 
 DEFINE_LOCK_GUARD_1(spinlock_irq, spinlock_t,
-		    spin_lock_irq(_T->lock),
-		    spin_unlock_irq(_T->lock))
+		    spin_lock_irq_disable(_T->lock),
+		    spin_unlock_irq_enable(_T->lock))
 
 DEFINE_LOCK_GUARD_1_COND(spinlock_irq, _try,
-			 spin_trylock_irq(_T->lock))
+			 spin_trylock_irq_disable(_T->lock))
 
 DEFINE_LOCK_GUARD_1(spinlock_bh, spinlock_t,
 		    spin_lock_bh(_T->lock),
@@ -645,12 +644,11 @@ DEFINE_LOCK_GUARD_1_COND(spinlock_bh, _try,
 			 spin_trylock_bh(_T->lock))
 
 DEFINE_LOCK_GUARD_1(spinlock_irqsave, spinlock_t,
-		    spin_lock_irqsave(_T->lock, _T->flags),
-		    spin_unlock_irqrestore(_T->lock, _T->flags),
-		    unsigned long flags)
+		    spin_lock_irq_disable(_T->lock),
+		    spin_unlock_irq_enable(_T->lock))
 
 DEFINE_LOCK_GUARD_1_COND(spinlock_irqsave, _try,
-			 spin_trylock_irqsave(_T->lock, _T->flags))
+			 spin_trylock_irq_disable(_T->lock))
 
 DEFINE_LOCK_GUARD_1(read_lock, rwlock_t,
 		    read_lock(_T->lock),
diff --git a/include/linux/spinlock_rt.h b/include/linux/spinlock_rt.h
index 6ea08fafa6d7b..f54e184735563 100644
--- a/include/linux/spinlock_rt.h
+++ b/include/linux/spinlock_rt.h
@@ -132,6 +132,12 @@ static __always_inline void spin_unlock_irqrestore(spinlock_t *lock,
 	rt_spin_unlock(lock);
 }
 
+static __always_inline int spin_trylock_irq_disable(spinlock_t *lock)
+{
+	return rt_spin_trylock(lock);
+}
+
+
 #define spin_trylock(lock)				\
 	__cond_lock(lock, rt_spin_trylock(lock))
 
-- 
2.49.0

Re: [RFC RESEND v10 14/14] locking: Switch to _irq_{disable,enable}() variants in cleanup guards

[Sebastian Andrzej Siewior]

On 2025-05-27 18:21:55 [-0400], Lyude Paul wrote:
> diff --git a/include/linux/spinlock_rt.h b/include/linux/spinlock_rt.h
> index 6ea08fafa6d7b..f54e184735563 100644
> --- a/include/linux/spinlock_rt.h
> +++ b/include/linux/spinlock_rt.h
> @@ -132,6 +132,12 @@ static __always_inline void spin_unlock_irqrestore(spinlock_t *lock,
>  	rt_spin_unlock(lock);
>  }
>  
> +static __always_inline int spin_trylock_irq_disable(spinlock_t *lock)
> +{
> +	return rt_spin_trylock(lock);
> +}
> +
> +

no extra space, please. It appears this should be part of another patch.
That patch where the spin_trylock_irq_disable() was introduced.

>  #define spin_trylock(lock)				\
>  	__cond_lock(lock, rt_spin_trylock(lock))
>  

Sebastian