FM / asm-generic

/usr/src/linux-headers-5.15.0-181/include/asm-generic/

/usr/src/linux-headers-5.15.0-181/include/asm-generic

Name	Size	Mode	Actions
bitops/	-	0755	rm
vdso/	-	0755	rm
asm-offsets.h	35	0644	edit dl rm
asm-prototypes.h	507	0644	edit dl rm
atomic.h	3569	0644	edit dl rm
atomic64.h	2549	0644	edit dl rm
audit_change_attr.h	484	0644	edit dl rm
audit_dir_write.h	528	0644	edit dl rm
audit_read.h	241	0644	edit dl rm
audit_signal.h	36	0644	edit dl rm
audit_write.h	461	0644	edit dl rm
barrier.h	6518	0644	edit dl rm
bitops.h	1197	0644	edit dl rm
bitsperlong.h	1207	0644	edit dl rm
bug.h	6939	0644	edit dl rm
cache.h	384	0644	edit dl rm
cacheflush.h	2401	0644	edit dl rm
checksum.h	1634	0644	edit dl rm
cmpxchg-local.h	1464	0644	edit dl rm
cmpxchg.h	2440	0644	edit dl rm
compat.h	1190	0644	edit dl rm
current.h	256	0644	edit dl rm
delay.h	1157	0644	edit dl rm
device.h	245	0644	edit dl rm
div64.h	7437	0644	edit dl rm
dma-mapping.h	248	0644	edit dl rm
dma.h	553	0644	edit dl rm
early_ioremap.h	1501	0644	edit dl rm
emergency-restart.h	248	0644	edit dl rm
error-injection.h	1162	0644	edit dl rm
exec.h	460	0644	edit dl rm
export.h	2344	0644	edit dl rm
extable.h	802	0644	edit dl rm
fb.h	271	0644	edit dl rm
fixmap.h	2932	0644	edit dl rm
flat.h	610	0644	edit dl rm
ftrace.h	314	0644	edit dl rm
futex.h	2669	0644	edit dl rm
getorder.h	1262	0644	edit dl rm
gpio.h	4537	0644	edit dl rm
hardirq.h	568	0644	edit dl rm
hugetlb.h	3030	0644	edit dl rm
hw_irq.h	270	0644	edit dl rm
hyperv-tlfs.h	19828	0644	edit dl rm
ide_iops.h	791	0644	edit dl rm
int-ll64.h	863	0644	edit dl rm
io.h	23436	0644	edit dl rm
ioctl.h	506	0644	edit dl rm
iomap.h	4019	0644	edit dl rm
irq.h	403	0644	edit dl rm
irqflags.h	1543	0644	edit dl rm
irq_regs.h	773	0644	edit dl rm
irq_work.h	194	0644	edit dl rm
Kbuild	1643	0644	edit dl rm
kdebug.h	182	0644	edit dl rm
kmap_size.h	263	0644	edit dl rm
kprobes.h	833	0644	edit dl rm
kvm_para.h	549	0644	edit dl rm
kvm_types.h	113	0644	edit dl rm
linkage.h	225	0644	edit dl rm
local.h	2282	0644	edit dl rm
local64.h	3887	0644	edit dl rm
logic_io.h	2402	0644	edit dl rm
mcs_spinlock.h	260	0644	edit dl rm
memory_model.h	1441	0644	edit dl rm
mmiowb.h	1764	0644	edit dl rm
mmiowb_types.h	249	0644	edit dl rm
mmu.h	449	0644	edit dl rm
mmu_context.h	1654	0644	edit dl rm
mm_hooks.h	753	0644	edit dl rm
module.h	1118	0644	edit dl rm
module.lds.h	278	0644	edit dl rm
mshyperv.h	7727	0644	edit dl rm
msi.h	1053	0644	edit dl rm
nommu_context.h	420	0644	edit dl rm
numa.h	1642	0644	edit dl rm
page.h	2351	0644	edit dl rm
param.h	367	0644	edit dl rm
parport.h	604	0644	edit dl rm
pci.h	401	0644	edit dl rm
pci_iomap.h	1920	0644	edit dl rm
percpu.h	12957	0644	edit dl rm
pgalloc.h	4747	0644	edit dl rm
pgtable-nop4d.h	1758	0644	edit dl rm
pgtable-nopmd.h	1980	0644	edit dl rm
pgtable-nopud.h	1995	0644	edit dl rm
pgtable_uffd.h	1052	0644	edit dl rm
preempt.h	1995	0644	edit dl rm
qrwlock.h	3859	0644	edit dl rm
qrwlock_types.h	682	0644	edit dl rm
qspinlock.h	3354	0644	edit dl rm
qspinlock_types.h	2134	0644	edit dl rm
resource.h	1100	0644	edit dl rm
rwonce.h	2932	0644	edit dl rm
seccomp.h	1187	0644	edit dl rm
sections.h	6104	0644	edit dl rm
serial.h	345	0644	edit dl rm
set_memory.h	362	0644	edit dl rm
shmparam.h	207	0644	edit dl rm
signal.h	308	0644	edit dl rm
simd.h	436	0644	edit dl rm
softirq_stack.h	286	0644	edit dl rm
spinlock.h	329	0644	edit dl rm
statfs.h	169	0644	edit dl rm
string.h	281	0644	edit dl rm
switch_to.h	755	0644	edit dl rm
syscall.h	5735	0644	edit dl rm
syscalls.h	739	0644	edit dl rm
termios-base.h	2164	0644	edit dl rm
termios.h	2877	0644	edit dl rm
timex.h	508	0644	edit dl rm
tlb.h	19264	0644	edit dl rm
tlbflush.h	485	0644	edit dl rm
topology.h	2219	0644	edit dl rm
trace_clock.h	391	0644	edit dl rm
uaccess.h	6508	0644	edit dl rm
unaligned.h	2886	0644	edit dl rm
user.h	242	0644	edit dl rm
vermagic.h	179	0644	edit dl rm
vga.h	587	0644	edit dl rm
vmlinux.lds.h	32881	0644	edit dl rm
vtime.h	52	0644	edit dl rm
word-at-a-time.h	2826	0644	edit dl rm
xor.h	13560	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-181/include/asm-generic/qrwlock.h (3859B)

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Queue read/write lock
 *
 * (C) Copyright 2013-2014 Hewlett-Packard Development Company, L.P.
 *
 * Authors: Waiman Long <waiman.long@hp.com>
 */
#ifndef __ASM_GENERIC_QRWLOCK_H
#define __ASM_GENERIC_QRWLOCK_H

#include <linux/atomic.h>
#include <asm/barrier.h>
#include <asm/processor.h>

#include <asm-generic/qrwlock_types.h>

/* Must be included from asm/spinlock.h after defining arch_spin_is_locked.  */

/*
 * Writer states & reader shift and bias.
 */
#define	_QW_WAITING	0x100		/* A writer is waiting	   */
#define	_QW_LOCKED	0x0ff		/* A writer holds the lock */
#define	_QW_WMASK	0x1ff		/* Writer mask		   */
#define	_QR_SHIFT	9		/* Reader count shift	   */
#define _QR_BIAS	(1U << _QR_SHIFT)

/*
 * External function declarations
 */
extern void queued_read_lock_slowpath(struct qrwlock *lock);
extern void queued_write_lock_slowpath(struct qrwlock *lock);

/**
 * queued_read_trylock - try to acquire read lock of a queue rwlock
 * @lock : Pointer to queue rwlock structure
 * Return: 1 if lock acquired, 0 if failed
 */
static inline int queued_read_trylock(struct qrwlock *lock)
{
	int cnts;

cnts = atomic_read(&lock->cnts);
	if (likely(!(cnts & _QW_WMASK))) {
		cnts = (u32)atomic_add_return_acquire(_QR_BIAS, &lock->cnts);
		if (likely(!(cnts & _QW_WMASK)))
			return 1;
		atomic_sub(_QR_BIAS, &lock->cnts);
	}
	return 0;
}

/**
 * queued_write_trylock - try to acquire write lock of a queue rwlock
 * @lock : Pointer to queue rwlock structure
 * Return: 1 if lock acquired, 0 if failed
 */
static inline int queued_write_trylock(struct qrwlock *lock)
{
	int cnts;

cnts = atomic_read(&lock->cnts);
	if (unlikely(cnts))
		return 0;

return likely(atomic_try_cmpxchg_acquire(&lock->cnts, &cnts,
				_QW_LOCKED));
}
/**
 * queued_read_lock - acquire read lock of a queue rwlock
 * @lock: Pointer to queue rwlock structure
 */
static inline void queued_read_lock(struct qrwlock *lock)
{
	int cnts;

cnts = atomic_add_return_acquire(_QR_BIAS, &lock->cnts);
	if (likely(!(cnts & _QW_WMASK)))
		return;

/* The slowpath will decrement the reader count, if necessary. */
	queued_read_lock_slowpath(lock);
}

/**
 * queued_write_lock - acquire write lock of a queue rwlock
 * @lock : Pointer to queue rwlock structure
 */
static inline void queued_write_lock(struct qrwlock *lock)
{
	int cnts = 0;
	/* Optimize for the unfair lock case where the fair flag is 0. */
	if (likely(atomic_try_cmpxchg_acquire(&lock->cnts, &cnts, _QW_LOCKED)))
		return;

queued_write_lock_slowpath(lock);
}

/**
 * queued_read_unlock - release read lock of a queue rwlock
 * @lock : Pointer to queue rwlock structure
 */
static inline void queued_read_unlock(struct qrwlock *lock)
{
	/*
	 * Atomically decrement the reader count
	 */
	(void)atomic_sub_return_release(_QR_BIAS, &lock->cnts);
}

/**
 * queued_write_unlock - release write lock of a queue rwlock
 * @lock : Pointer to queue rwlock structure
 */
static inline void queued_write_unlock(struct qrwlock *lock)
{
	smp_store_release(&lock->wlocked, 0);
}

/**
 * queued_rwlock_is_contended - check if the lock is contended
 * @lock : Pointer to queue rwlock structure
 * Return: 1 if lock contended, 0 otherwise
 */
static inline int queued_rwlock_is_contended(struct qrwlock *lock)
{
	return arch_spin_is_locked(&lock->wait_lock);
}

/*
 * Remapping rwlock architecture specific functions to the corresponding
 * queue rwlock functions.
 */
#define arch_read_lock(l)		queued_read_lock(l)
#define arch_write_lock(l)		queued_write_lock(l)
#define arch_read_trylock(l)		queued_read_trylock(l)
#define arch_write_trylock(l)		queued_write_trylock(l)
#define arch_read_unlock(l)		queued_read_unlock(l)
#define arch_write_unlock(l)		queued_write_unlock(l)
#define arch_rwlock_is_contended(l)	queued_rwlock_is_contended(l)

#endif /* __ASM_GENERIC_QRWLOCK_H */

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