mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-12-28 16:56:26 +00:00
3774b28d8f
The 'inc' parameter of lockevent_add() and the cond parameter of lockevent_cond_inc() are only evaluated when CONFIG_LOCK_EVENT_COUNTS is on. That can cause problem if those parameters are expressions with side effect like a "++". Fix this by evaluating those non-event parameters once even if CONFIG_LOCK_EVENT_COUNTS is off. This will also eliminate the need of the __maybe_unused attribute to the wait_early local variable in pv_wait_node(). Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Link: https://lore.kernel.org/r/20240319005004.1692705-1-longman@redhat.com
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* Authors: Waiman Long <longman@redhat.com>
|
|
*/
|
|
|
|
#ifndef __LOCKING_LOCK_EVENTS_H
|
|
#define __LOCKING_LOCK_EVENTS_H
|
|
|
|
enum lock_events {
|
|
|
|
#include "lock_events_list.h"
|
|
|
|
lockevent_num, /* Total number of lock event counts */
|
|
LOCKEVENT_reset_cnts = lockevent_num,
|
|
};
|
|
|
|
#ifdef CONFIG_LOCK_EVENT_COUNTS
|
|
/*
|
|
* Per-cpu counters
|
|
*/
|
|
DECLARE_PER_CPU(unsigned long, lockevents[lockevent_num]);
|
|
|
|
/*
|
|
* Increment the statistical counters. use raw_cpu_inc() because of lower
|
|
* overhead and we don't care if we loose the occasional update.
|
|
*/
|
|
static inline void __lockevent_inc(enum lock_events event, bool cond)
|
|
{
|
|
if (cond)
|
|
raw_cpu_inc(lockevents[event]);
|
|
}
|
|
|
|
#define lockevent_inc(ev) __lockevent_inc(LOCKEVENT_ ##ev, true)
|
|
#define lockevent_cond_inc(ev, c) __lockevent_inc(LOCKEVENT_ ##ev, c)
|
|
|
|
static inline void __lockevent_add(enum lock_events event, int inc)
|
|
{
|
|
raw_cpu_add(lockevents[event], inc);
|
|
}
|
|
|
|
#define lockevent_add(ev, c) __lockevent_add(LOCKEVENT_ ##ev, c)
|
|
|
|
#else /* CONFIG_LOCK_EVENT_COUNTS */
|
|
|
|
#define lockevent_inc(ev)
|
|
#define lockevent_add(ev, c) do { (void)(c); } while (0)
|
|
#define lockevent_cond_inc(ev, c) do { (void)(c); } while (0)
|
|
|
|
#endif /* CONFIG_LOCK_EVENT_COUNTS */
|
|
|
|
ssize_t lockevent_read(struct file *file, char __user *user_buf,
|
|
size_t count, loff_t *ppos);
|
|
|
|
#endif /* __LOCKING_LOCK_EVENTS_H */
|