linux-kernel - [PATCH 1/2] locking/rtmutex: Delete save_state member of struct rt

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Date:   Tue, 10 Apr 2018 09:27:49 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     peterz@...radead.org, tglx@...utronix.de, mingo@...nel.org
Cc:     longman@...hat.com, dave@...olabs.net,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 1/2] locking/rtmutex: Delete save_state member of struct rt_mutex

This field (debug) is unused. Furthermore it looks like a result
of rtmutex from -rt into upstream, where it serves to determine
if the wakeup is for a task blocked on a "sleeping spinlock",
iow if this is a regular rt_mutex_lock() or rt_spin_lock().

Of course, upstream we only have regular rt_mutexes, thus we
can safely assume nothing will be done with this field anyway.
There is also the fact that this is under debug.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 include/linux/rtmutex.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h
index 1b92a28dd672..572606acd700 100644
--- a/include/linux/rtmutex.h
+++ b/include/linux/rtmutex.h
@@ -32,7 +32,6 @@ struct rt_mutex {
 	struct rb_root_cached   waiters;
 	struct task_struct	*owner;
 #ifdef CONFIG_DEBUG_RT_MUTEXES
-	int			save_state;
 	const char		*name, *file;
 	int			line;
 	void			*magic;
-- 
2.13.6