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locking/rtmutex: Remove output from deadlock detector

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The rtmutex specific deadlock detector predates lockdep coverage of rtmutex
and since commit f5694788ad ("rt_mutex: Add lockdep annotations") it
contains a lot of redundant functionality:

 - lockdep will detect an potential deadlock before rtmutex-debug
   has a chance to do so

 - the deadlock debugging is restricted to rtmutexes which are not
   associated to futexes and have an active waiter, which is covered by
   lockdep already

Remove the redundant functionality and move actual deadlock WARN() into the
deadlock code path. The latter needs a seperate cleanup.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210326153943.320398604@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior
2021-03-26 16:29:32 +01:00
committed by Ingo Molnar
parent 2d445c3e4a
commit 6d41c675a5
6 changed files with 1 additions and 130 deletions
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4
kernel/locking/rtmutex_common.h
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@@ -29,10 +29,6 @@ struct rt_mutex_waiter {
struct rb_node pi_tree_entry;
struct task_struct *task;
struct rt_mutex *lock;
#ifdef CONFIG_DEBUG_RT_MUTEXES
struct pid *deadlock_task_pid;
struct rt_mutex *deadlock_lock;
#endif
int prio;
u64 deadline;
};