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Re: [PATCH v4 03/12] xen/spinlock: introduce new type for recursive spinlocks
- To: Julien Grall <julien@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Tue, 12 Dec 2023 14:04:09 +0100
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>
- Delivery-date: Tue, 12 Dec 2023 13:04:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.12.23 13:57, Julien Grall wrote:
Hi Juergen,
On 12/12/2023 09:47, Juergen Gross wrote:
diff --git a/xen/include/xen/spinlock.h b/xen/include/xen/spinlock.h
index 1cd9120eac..20d15f34dd 100644
--- a/xen/include/xen/spinlock.h
+++ b/xen/include/xen/spinlock.h
@@ -45,7 +45,7 @@ union lock_debug { };
lock profiling on:
Global locks which should be subject to profiling must be declared via
- DEFINE_SPINLOCK.
+ DEFINE_[R]SPINLOCK.
For locks in structures further measures are necessary:
- the structure definition must include a profile_head with exactly this
@@ -56,7 +56,7 @@ union lock_debug { };
- the single locks which are subject to profiling have to be initialized
via
- spin_lock_init_prof(ptr, lock);
+ [r]spin_lock_init_prof(ptr, lock);
with ptr being the main structure pointer and lock the spinlock field
@@ -109,12 +109,16 @@ struct lock_profile_qhead {
spinlock_t l = _SPIN_LOCK_UNLOCKED(NULL);
\
static struct lock_profile __lock_profile_data_##l = _LOCK_PROFILE(l);
\
_LOCK_PROFILE_PTR(l)
+#define DEFINE_RSPINLOCK(l) \
+ rspinlock_t l = _SPIN_LOCK_UNLOCKED(NULL); \
+ static struct lock_profile __lock_profile_data_##l = _LOCK_PROFILE(l); \
+ _LOCK_PROFILE_PTR(l)
-#define spin_lock_init_prof(s, l) \
+#define __spin_lock_init_prof(s, l, locktype) \
If I am not mistaken the double-underscore prefix is a violation in MISRA. So
can this be renamed to:
spin_lock_init_prof__()?
Fine with me.
Note that __lock_profile_data_##l and __lock_profile_##name seem to violate
MISRA, too. Probably a good idea to change them as well? This should probably
be done as a prereq patch then?
The rest of the code looks fine. I have checked the lock you are modifying in
common/drivers and they all are meant to be recursive lock:
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
Thanks,
Juergen
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