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ff7138813a
lockevent_read() has a __weak definition and the only caller in kernel/locking/lock_events.c, plus a strong definition in qspinlock_stat.h that overrides it, but no other declaration. This causes a W=1 warning: kernel/locking/lock_events.c:61:16: error: no previous prototype for 'lockevent_read' [-Werror=missing-prototypes] Add shared prototype to avoid the warnings. Link: https://lkml.kernel.org/r/20230517131102.934196-7-arnd@kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Lameter <cl@linux.com> Cc: Dennis Zhou <dennis@kernel.org> Cc: Eric Paris <eparis@redhat.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Moore <paul@paul-moore.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rafael J. Wysocki <rafael@kernel.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <longman@redhat.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Authors: Waiman Long <longman@redhat.com>
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*/
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#ifndef __LOCKING_LOCK_EVENTS_H
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#define __LOCKING_LOCK_EVENTS_H
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enum lock_events {
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#include "lock_events_list.h"
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lockevent_num, /* Total number of lock event counts */
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LOCKEVENT_reset_cnts = lockevent_num,
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};
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#ifdef CONFIG_LOCK_EVENT_COUNTS
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/*
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* Per-cpu counters
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*/
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DECLARE_PER_CPU(unsigned long, lockevents[lockevent_num]);
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/*
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* Increment the statistical counters. use raw_cpu_inc() because of lower
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* overhead and we don't care if we loose the occasional update.
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*/
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static inline void __lockevent_inc(enum lock_events event, bool cond)
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{
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if (cond)
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raw_cpu_inc(lockevents[event]);
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}
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#define lockevent_inc(ev) __lockevent_inc(LOCKEVENT_ ##ev, true)
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#define lockevent_cond_inc(ev, c) __lockevent_inc(LOCKEVENT_ ##ev, c)
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static inline void __lockevent_add(enum lock_events event, int inc)
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{
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raw_cpu_add(lockevents[event], inc);
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}
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#define lockevent_add(ev, c) __lockevent_add(LOCKEVENT_ ##ev, c)
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#else /* CONFIG_LOCK_EVENT_COUNTS */
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#define lockevent_inc(ev)
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#define lockevent_add(ev, c)
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#define lockevent_cond_inc(ev, c)
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#endif /* CONFIG_LOCK_EVENT_COUNTS */
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ssize_t lockevent_read(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos);
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#endif /* __LOCKING_LOCK_EVENTS_H */
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