user/sven/linux.git/kernel/locking/lockdep_proc.c, branch v4.4.203

locking/lockdep: Hide unused 'class' variable

2019-08-04T07:34:59Z

[ Upstream commit 68037aa78208f34bda4e5cd76c357f718b838cbb ] The usage is now hidden in an #ifdef, so we need to move the variable itself in there as well to avoid this warning: kernel/locking/lockdep_proc.c:203:21: error: unused variable 'class' [-Werror,-Wunused-variable] Signed-off-by: Arnd Bergmann Signed-off-by: Peter Zijlstra (Intel) Cc: Andrew Morton Cc: Bart Van Assche Cc: Linus Torvalds Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Qian Cai Cc: Thomas Gleixner Cc: Waiman Long Cc: Will Deacon Cc: Will Deacon Cc: Yuyang Du Cc: frederic@kernel.org Fixes: 68d41d8c94a3 ("locking/lockdep: Fix lock used or unused stats error") Link: https://lkml.kernel.org/r/20190715092809.736834-1-arnd@arndb.de Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin

locking/lockdep: Fix lock used or unused stats error

2019-08-04T07:34:59Z

[ Upstream commit 68d41d8c94a31dfb8233ab90b9baf41a2ed2da68 ] The stats variable nr_unused_locks is incremented every time a new lock class is register and decremented when the lock is first used in __lock_acquire(). And after all, it is shown and checked in lockdep_stats. However, under configurations that either CONFIG_TRACE_IRQFLAGS or CONFIG_PROVE_LOCKING is not defined: The commit: 091806515124b20 ("locking/lockdep: Consolidate lock usage bit initialization") missed marking the LOCK_USED flag at IRQ usage initialization because as mark_usage() is not called. And the commit: 886532aee3cd42d ("locking/lockdep: Move mark_lock() inside CONFIG_TRACE_IRQFLAGS && CONFIG_PROVE_LOCKING") further made mark_lock() not defined such that the LOCK_USED cannot be marked at all when the lock is first acquired. As a result, we fix this by not showing and checking the stats under such configurations for lockdep_stats. Reported-by: Qian Cai Signed-off-by: Yuyang Du Signed-off-by: Peter Zijlstra (Intel) Cc: Andrew Morton Cc: Linus Torvalds Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Will Deacon Cc: arnd@arndb.de Cc: frederic@kernel.org Link: https://lkml.kernel.org/r/20190709101522.9117-1-duyuyang@gmail.com Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin

treewide: Remove old email address

2015-11-23T08:44:58Z

There were still a number of references to my old Red Hat email address in the kernel source. Remove these while keeping the Red Hat copyright notices intact. Signed-off-by: Peter Zijlstra (Intel) Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Signed-off-by: Ingo Molnar

lockdep: Fix a race between /proc/lock_stat and module unload

2015-06-07T13:46:30Z

The lock_class iteration of /proc/lock_stat is not serialized against the lockdep_free_key_range() call from module unload. Therefore it can happen that we find a class of which ->name/->key are no longer valid. There is a further bug in zap_class() that left ->name dangling. Cure this. Use RCU_INIT_POINTER() because NULL. Since lockdep_free_key_range() is rcu_sched serialized, we can read both ->name and ->key under rcu_read_lock_sched() (preempt-disable) and be assured that if we observe a !NULL value it stays safe to use for as long as we hold that lock. If we observe both NULL, skip the entry. Reported-by: Jerome Marchand Tested-by: Jerome Marchand Signed-off-by: Peter Zijlstra (Intel) Cc: Andrew Morton Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/20150602105013.GS3644@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar

lockdep/proc: Fix lock-time avg computation

2013-11-11T11:41:34Z

> kernel/locking/lockdep_proc.c: In function 'seq_lock_time': > >> kernel/locking/lockdep_proc.c:424:23: warning: comparison of distinct pointer types lacks a cast [enabled by default] > > 418 static void seq_lock_time(struct seq_file *m, struct lock_time *lt) > 419 { > 420 seq_printf(m, "%14lu", lt->nr); > 421 seq_time(m, lt->min); > 422 seq_time(m, lt->max); > 423 seq_time(m, lt->total); > > 424 seq_time(m, lt->nr ? do_div(lt->total, lt->nr) : 0); > 425 } My compiler refuses to actually say that; but it looks wrong in that do_div() returns the remainder, not the divisor. Reported-by: Fengguang Wu Tested-by: Fengguang Wu Signed-off-by: Peter Zijlstra Cc: Davidlohr Bueso Link: http://lkml.kernel.org/r/20131106164230.GE16117@laptop.programming.kicks-ass.net Signed-off-by: Ingo Molnar

locking: Move the lockdep code to kernel/locking/

2013-11-06T06:55:08Z

Suggested-by: Ingo Molnar Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/n/tip-wl7s3tta5isufzfguc23et06@git.kernel.org Signed-off-by: Ingo Molnar