[tip: locking/core] locking/rtmutex: Move debug functions as inlines into common header

tip-bot2 for Thomas Gleixner
2021-03-24T07:23:21Z

The following commit has been merged into the locking/core branch of tip:

Commit-ID: 143d13d824e4ae416433eb92eb428b6771f94f00
Gitweb: https://git.kernel.org/tip/143d13d824e4ae416433eb92eb428b6771f94f00
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Tue, 23 Mar 2021 22:30:29 +01:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Wed, 24 Mar 2021 08:06:08 +01:00

locking/rtmutex: Move debug functions as inlines into common header

There is no value in having two header files providing just empty stubs and
a C file which implements trivial debug functions which can just be inlined.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210323213708.503445251@linutronix.de
---
kernel/locking/Makefile | 2 +-
kernel/locking/rtmutex-debug.c | 65 +--------------------------------
kernel/locking/rtmutex-debug.h | 26 +-------------
kernel/locking/rtmutex.h | 24 +------------
kernel/locking/rtmutex_common.h | 30 ++++++++++++---
5 files changed, 25 insertions(+), 122 deletions(-)
delete mode 100644 kernel/locking/rtmutex-debug.c
delete mode 100644 kernel/locking/rtmutex-debug.h
delete mode 100644 kernel/locking/rtmutex.h

diff --git a/kernel/locking/Makefile b/kernel/locking/Makefile
index 8838f1d..3572808 100644
--- a/kernel/locking/Makefile
+++ b/kernel/locking/Makefile
@@ -12,7 +12,6 @@ ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_lockdep.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_lockdep_proc.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_mutex-debug.o = $(CC_FLAGS_FTRACE)
-CFLAGS_REMOVE_rtmutex-debug.o = $(CC_FLAGS_FTRACE)
endif

obj-$(CONFIG_DEBUG_IRQFLAGS) += irqflag-debug.o
@@ -26,7 +25,6 @@ obj-$(CONFIG_LOCK_SPIN_ON_OWNER) += osq_lock.o
obj-$(CONFIG_PROVE_LOCKING) += spinlock.o
obj-$(CONFIG_QUEUED_SPINLOCKS) += qspinlock.o
obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
-obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
obj-$(CONFIG_QUEUED_RWLOCKS) += qrwlock.o
diff --git a/kernel/locking/rtmutex-debug.c b/kernel/locking/rtmutex-debug.c
deleted file mode 100644
index f1a83ec..0000000
--- a/kernel/locking/rtmutex-debug.c
+++ /dev/null
@@ -1,65 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * RT-Mutexes: blocking mutual exclusion locks with PI support
- *
- * started by Ingo Molnar and Thomas Gleixner:
- *
- * Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
- * Copyright (C) 2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
- *
- * This code is based on the rt.c implementation in the preempt-rt tree.
- * Portions of said code are
- *
- * Copyright (C) 2004 LynuxWorks, Inc., Igor Manyilov, Bill Huey
- * Copyright (C) 2006 Esben Nielsen
- * Copyright (C) 2006 Kihon Technologies Inc.,
- * Steven Rostedt <rostedt@goodmis.org>
- *
- * See rt.c in preempt-rt for proper credits and further information
- */
-#include <linux/sched.h>
-#include <linux/sched/rt.h>
-#include <linux/sched/debug.h>
-#include <linux/delay.h>
-#include <linux/export.h>
-#include <linux/spinlock.h>
-#include <linux/kallsyms.h>
-#include <linux/syscalls.h>
-#include <linux/interrupt.h>
-#include <linux/rbtree.h>
-#include <linux/fs.h>
-#include <linux/debug_locks.h>
-
-#include "rtmutex_common.h"
-
-void debug_rt_mutex_unlock(struct rt_mutex *lock)
-{
- DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current);
-}
-
-void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock)
-{
- DEBUG_LOCKS_WARN_ON(!rt_mutex_owner(lock));
-}
-
-void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter)
-{
- memset(waiter, 0x11, sizeof(*waiter));
-}
-
-void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter)
-{
- memset(waiter, 0x22, sizeof(*waiter));
-}
-
-void debug_rt_mutex_init(struct rt_mutex *lock, const char *name, struct lock_class_key *key)
-{
- /*
- * Make sure we are not reinitializing a held lock:
- */
- debug_check_no_locks_freed((void *)lock, sizeof(*lock));
-
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
- lockdep_init_map(&lock->dep_map, name, key, 0);
-#endif
-}
diff --git a/kernel/locking/rtmutex-debug.h b/kernel/locking/rtmutex-debug.h
deleted file mode 100644
index 659e93e..0000000
--- a/kernel/locking/rtmutex-debug.h
+++ /dev/null
@@ -1,26 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * RT-Mutexes: blocking mutual exclusion locks with PI support
- *
- * started by Ingo Molnar and Thomas Gleixner:
- *
- * Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
- * Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
- *
- * This file contains macros used solely by rtmutex.c. Debug version.
- */
-
-extern void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter);
-extern void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter);
-extern void debug_rt_mutex_init(struct rt_mutex *lock, const char *name, struct lock_class_key *key);
-extern void debug_rt_mutex_lock(struct rt_mutex *lock);
-extern void debug_rt_mutex_unlock(struct rt_mutex *lock);
-extern void debug_rt_mutex_proxy_lock(struct rt_mutex *lock,
- struct task_struct *powner);
-extern void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock);
-
-static inline bool debug_rt_mutex_detect_deadlock(struct rt_mutex_waiter *waiter,
- enum rtmutex_chainwalk walk)
-{
- return (waiter != NULL);
-}
diff --git a/kernel/locking/rtmutex.h b/kernel/locking/rtmutex.h
deleted file mode 100644
index 1e484ab..0000000
--- a/kernel/locking/rtmutex.h
+++ /dev/null
@@ -1,24 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * RT-Mutexes: blocking mutual exclusion locks with PI support
- *
- * started by Ingo Molnar and Thomas Gleixner:
- *
- * Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
- * Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
- *
- * This file contains macros used solely by rtmutex.c.
- * Non-debug version.
- */
-
-#define debug_rt_mutex_init_waiter(w) do { } while (0)
-#define debug_rt_mutex_free_waiter(w) do { } while (0)
-#define debug_rt_mutex_proxy_unlock(l) do { } while (0)
-#define debug_rt_mutex_unlock(l) do { } while (0)
-#define debug_rt_mutex_init(m, n, k) do { } while (0)
-
-static inline bool debug_rt_mutex_detect_deadlock(struct rt_mutex_waiter *w,
- enum rtmutex_chainwalk walk)
-{
- return walk == RT_MUTEX_FULL_CHAINWALK;
-}
diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h
index 1e11855..8456db5 100644
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -13,6 +13,7 @@
#ifndef __KERNEL_RTMUTEX_COMMON_H
#define __KERNEL_RTMUTEX_COMMON_H

+#include <linux/debug_locks.h>
#include <linux/rtmutex.h>
#include <linux/sched/wake_q.h>

@@ -123,10 +124,29 @@ extern bool __rt_mutex_futex_unlock(struct rt_mutex *lock,

extern void rt_mutex_postunlock(struct wake_q_head *wake_q);

-#ifdef CONFIG_DEBUG_RT_MUTEXES
-# include "rtmutex-debug.h"
-#else
-# include "rtmutex.h"
-#endif
+/* Debug functions */
+static inline void debug_rt_mutex_unlock(struct rt_mutex *lock)
+{
+ if (IS_ENABLED(CONFIG_DEBUG_RT_MUTEXES))
+ DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current);
+}
+
+static inline void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock)
+{
+ if (IS_ENABLED(CONFIG_DEBUG_RT_MUTEXES))
+ DEBUG_LOCKS_WARN_ON(!rt_mutex_owner(lock));
+}
+
+static inline void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter)
+{
+ if (IS_ENABLED(CONFIG_DEBUG_RT_MUTEXES))
+ memset(waiter, 0x11, sizeof(*waiter));
+}
+
+static inline void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter)
+{
+ if (IS_ENABLED(CONFIG_DEBUG_RT_MUTEXES))
+ memset(waiter, 0x22, sizeof(*waiter));
+}

#endif