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Subject[tip:locking/core] locking/lockdep: increase size of counters for lockdep statistics
Commit-ID:  9156e545765e467e6268c4814cfa609ebb16237e
Gitweb: https://git.kernel.org/tip/9156e545765e467e6268c4814cfa609ebb16237e
Author: Kobe Wu <kobe-cp.wu@mediatek.com>
AuthorDate: Mon, 24 Jun 2019 16:35:48 +0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 25 Jun 2019 10:17:08 +0200

locking/lockdep: increase size of counters for lockdep statistics

When system has been running for a long time, signed integer
counters are not enough for some lockdep statistics. Using
unsigned long counters can satisfy the requirement. Besides,
most of lockdep statistics are unsigned. It is better to use
unsigned int instead of int.

Remove unused variables.
- max_recursion_depth
- nr_cyclic_check_recursions
- nr_find_usage_forwards_recursions
- nr_find_usage_backwards_recursions

Signed-off-by: Kobe Wu <kobe-cp.wu@mediatek.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <linux-mediatek@lists.infradead.org>
Cc: <wsd_upstream@mediatek.com>
Cc: Eason Lin <eason-yh.lin@mediatek.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Link: https://lkml.kernel.org/r/1561365348-16050-1-git-send-email-kobe-cp.wu@mediatek.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/locking/lockdep_internals.h | 36 ++++++++++++++++--------------------
1 file changed, 16 insertions(+), 20 deletions(-)

diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h
index 150ec3f0c5b5..cc83568d5012 100644
--- a/kernel/locking/lockdep_internals.h
+++ b/kernel/locking/lockdep_internals.h
@@ -131,7 +131,6 @@ extern unsigned int nr_hardirq_chains;
extern unsigned int nr_softirq_chains;
extern unsigned int nr_process_chains;
extern unsigned int max_lockdep_depth;
-extern unsigned int max_recursion_depth;

extern unsigned int max_bfs_queue_depth;

@@ -160,25 +159,22 @@ lockdep_count_backward_deps(struct lock_class *class)
* and we want to avoid too much cache bouncing.
*/
struct lockdep_stats {
- int chain_lookup_hits;
- int chain_lookup_misses;
- int hardirqs_on_events;
- int hardirqs_off_events;
- int redundant_hardirqs_on;
- int redundant_hardirqs_off;
- int softirqs_on_events;
- int softirqs_off_events;
- int redundant_softirqs_on;
- int redundant_softirqs_off;
- int nr_unused_locks;
- int nr_redundant_checks;
- int nr_redundant;
- int nr_cyclic_checks;
- int nr_cyclic_check_recursions;
- int nr_find_usage_forwards_checks;
- int nr_find_usage_forwards_recursions;
- int nr_find_usage_backwards_checks;
- int nr_find_usage_backwards_recursions;
+ unsigned long chain_lookup_hits;
+ unsigned int chain_lookup_misses;
+ unsigned long hardirqs_on_events;
+ unsigned long hardirqs_off_events;
+ unsigned long redundant_hardirqs_on;
+ unsigned long redundant_hardirqs_off;
+ unsigned long softirqs_on_events;
+ unsigned long softirqs_off_events;
+ unsigned long redundant_softirqs_on;
+ unsigned long redundant_softirqs_off;
+ int nr_unused_locks;
+ unsigned int nr_redundant_checks;
+ unsigned int nr_redundant;
+ unsigned int nr_cyclic_checks;
+ unsigned int nr_find_usage_forwards_checks;
+ unsigned int nr_find_usage_backwards_checks;

/*
* Per lock class locking operation stat counts
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