linux-kernel - Re: [ANNOUNCE] 4.9.327-rt197

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Message-ID: <YzcEIU17EIZ7ZIF5@linutronix.de>
Date:   Fri, 30 Sep 2022 16:58:41 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Mark Gross <markgross@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Danie l Wagner <dwagner@...e.de>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Clark Williams <williams@...hat.com>,
        Junxiao Chang <junxiao.chang@...el.com>
Subject: Re: [ANNOUNCE] 4.9.327-rt197

On 2022-09-23 13:09:41 [-0700], Mark Gross wrote:
> > As this was a tricky one I request people to give a good look over.

You did good. I not so much. If you could please add the following patch
on top, then it will compile also on !RT.

Thank you for work.

------->8----------

From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Date: Fri, 30 Sep 2022 16:55:34 +0200
Subject: [PATCH] local_lock: Provide INIT_LOCAL_LOCK().

The original code was using INIT_LOCAL_LOCK() and I tried to sneak
around it and forgot that this code also needs to compile on !RT
platforms.

Provide INIT_LOCAL_LOCK() to initialize properly on RT and do nothing on
!RT. Let random.c use which is the only user so far and oes not compile
on !RT otherwise.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 drivers/char/random.c     | 4 ++--
 include/linux/locallock.h | 5 +++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index daea466812fed..86c475f70343d 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -236,7 +236,7 @@ struct crng {
 
 static DEFINE_PER_CPU(struct crng, crngs) = {
 	.generation = ULONG_MAX,
-	.lock.lock = __SPIN_LOCK_UNLOCKED(crngs.lock.lock),
+	.lock = INIT_LOCAL_LOCK(crngs.lock),
 };
 
 /* Used by crng_reseed() and crng_make_state() to extract a new seed from the input pool. */
@@ -515,7 +515,7 @@ struct batch_ ##type {								\
 };										\
 										\
 static DEFINE_PER_CPU(struct batch_ ##type, batched_entropy_ ##type) = {	\
-	.lock.lock = __SPIN_LOCK_UNLOCKED(batched_entropy_ ##type.lock.lock),	\
+	.lock = INIT_LOCAL_LOCK(batched_entropy_ ##type.lock),			\
 	.position = UINT_MAX							\
 };										\
 										\
diff --git a/include/linux/locallock.h b/include/linux/locallock.h
index 0c3ff5b23f6a1..70af9a177197e 100644
--- a/include/linux/locallock.h
+++ b/include/linux/locallock.h
@@ -22,6 +22,8 @@ struct local_irq_lock {
 	unsigned long		flags;
 };
 
+#define INIT_LOCAL_LOCK(lvar)			{ .lock = __SPIN_LOCK_UNLOCKED((lvar).lock.lock) }
+
 #define DEFINE_LOCAL_IRQ_LOCK(lvar)					\
 	DEFINE_PER_CPU(struct local_irq_lock, lvar) = {			\
 		.lock = __SPIN_LOCK_UNLOCKED((lvar).lock) }
@@ -256,6 +258,9 @@ static inline int __local_unlock_irqrestore(struct local_irq_lock *lv,
 
 #else /* PREEMPT_RT_BASE */
 
+struct local_irq_lock { };
+#define INIT_LOCAL_LOCK(lvar)			{ }
+
 #define DEFINE_LOCAL_IRQ_LOCK(lvar)		__typeof__(const int) lvar
 #define DECLARE_LOCAL_IRQ_LOCK(lvar)		extern __typeof__(const int) lvar
 
-- 
2.37.2


Sebastian