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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 29 Sep 2020 15:21:17 +0200
Subject: [PATCH 01/23] locking/rtmutex: Remove cruft
Most of this is around since the very beginning. I'm not sure if this
was used while the rtmutex-deadlock-tester was around but today it seems
to only waste memory:
- save_state: No users
- name: Assigned and printed if a dead lock was detected. I'm keeping it
but want to point out that lockdep has the same information.
- file + line: Printed if ::name was NULL. This is only used for
in-kernel locks so it ::name shouldn't be NULL and then ::file and
::line isn't used.
- magic: Assigned to NULL by rt_mutex_destroy().
Remove members of rt_mutex which are not used.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
include/linux/rtmutex.h | 7 ++-----
kernel/locking/rtmutex-debug.c | 7 +------
kernel/locking/rtmutex.c | 3 ---
kernel/locking/rtmutex_common.h | 1 -
4 files changed, 3 insertions(+), 15 deletions(-)
--- a/include/linux/rtmutex.h
+++ b/include/linux/rtmutex.h
@@ -32,10 +32,7 @@ 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;
+ const char *name;
#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
@@ -60,7 +57,7 @@ struct hrtimer_sleeper;
#ifdef CONFIG_DEBUG_RT_MUTEXES
# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \
- , .name = #mutexname, .file = __FILE__, .line = __LINE__
+ , .name = #mutexname
# define rt_mutex_init(mutex) \
do { \
--- a/kernel/locking/rtmutex-debug.c
+++ b/kernel/locking/rtmutex-debug.c
@@ -42,12 +42,7 @@ static void printk_task(struct task_stru
static void printk_lock(struct rt_mutex *lock, int print_owner)
{
- if (lock->name)
- printk(" [%p] {%s}\n",
- lock, lock->name);
- else
- printk(" [%p] {%s:%d}\n",
- lock, lock->file, lock->line);
+ printk(" [%p] {%s}\n", lock, lock->name);
if (print_owner && rt_mutex_owner(lock)) {
printk(".. ->owner: %p\n", lock->owner);
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1655,9 +1655,6 @@ void __sched rt_mutex_futex_unlock(struc
void rt_mutex_destroy(struct rt_mutex *lock)
{
WARN_ON(rt_mutex_is_locked(lock));
-#ifdef CONFIG_DEBUG_RT_MUTEXES
- lock->magic = NULL;
-#endif
}
EXPORT_SYMBOL_GPL(rt_mutex_destroy);
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -30,7 +30,6 @@ struct rt_mutex_waiter {
struct task_struct *task;
struct rt_mutex *lock;
#ifdef CONFIG_DEBUG_RT_MUTEXES
- unsigned long ip;
struct pid *deadlock_task_pid;
struct rt_mutex *deadlock_lock;
#endif
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