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@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
---
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
