Attachment 307154 Details for Bug 446397 – rwlock-prio-fix patch from Steven

rwlock-prio-fix patch from Steven

rwlock-prio-fix.patch (text/plain), 1.21 KB, created by IBM Bug Proxy on 2008-05-30 00:33:00 UTC

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Creator: IBM Bug Proxy

Created: 2008-05-30 00:33:00 UTC

Size: 1.21 KB

patch

obsolete

>From: Steven Rostedt <srostedt@redhat.com>
>Subject: rwlock: reset prio on unlocks and wakeups
>
>The unlocking of an rwlock that woke up processes did not update
>the rwm prio.
>
>Signed-off-by: Steven Rostedt <srostedt@redhat.com>
>---
> kernel/rtmutex.c |   12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
>Index: linux-2.6.24.7-rt11/kernel/rtmutex.c
>===================================================================
>--- linux-2.6.24.7-rt11.orig/kernel/rtmutex.c	2008-05-29 19:22:13.000000000 -0400
>+++ linux-2.6.24.7-rt11/kernel/rtmutex.c	2008-05-29 19:35:29.000000000 -0400
>@@ -1791,6 +1791,12 @@ rt_read_slowunlock(struct rw_mutex *rwm,
>
> 	wakeup_next_waiter(mutex, savestate);
>
>+	if (rt_mutex_has_waiters(mutex)) {
>+		waiter = rt_mutex_top_waiter(mutex);
>+		rwm->prio = waiter->task->prio;
>+	} else
>+		rwm->prio = MAX_PRIO;
>+
>  out:
> 	spin_unlock_irqrestore(&mutex->wait_lock, flags);
>
>@@ -1932,7 +1938,11 @@ rt_write_slowunlock(struct rw_mutex *rwm
> 		plist_del(&next->pi_list_entry, &pendowner->pi_waiters);
> 		/* add back in as top waiter */
> 		plist_add(&next->pi_list_entry, &pendowner->pi_waiters);
>-	}
>+
>+		rwm->prio = next->task->prio;
>+	} else
>+		rwm->prio = MAX_PRIO;
>+
> 	spin_unlock(&pendowner->pi_lock);
>
>  out:

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