__ __ __ __ _____ _ _ _____ _ _ _ | \/ | \ \ / / | __ \ (_) | | / ____| | | | | | \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | | | |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | | | | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | | |_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1 if you need WebShell for Seo everyday contact me on Telegram Telegram Address : @jackleetFor_More_Tools:
/* SPDX-License-Identifier: GPL-2.0 */
/*
* 'Generic' ticket-lock implementation.
*
* It relies on atomic_fetch_add() having well defined forward progress
* guarantees under contention. If your architecture cannot provide this, stick
* to a test-and-set lock.
*
* It also relies on atomic_fetch_add() being safe vs smp_store_release() on a
* sub-word of the value. This is generally true for anything LL/SC although
* you'd be hard pressed to find anything useful in architecture specifications
* about this. If your architecture cannot do this you might be better off with
* a test-and-set.
*
* It further assumes atomic_*_release() + atomic_*_acquire() is RCpc and hence
* uses atomic_fetch_add() which is RCsc to create an RCsc hot path, along with
* a full fence after the spin to upgrade the otherwise-RCpc
* atomic_cond_read_acquire().
*
* The implementation uses smp_cond_load_acquire() to spin, so if the
* architecture has WFE like instructions to sleep instead of poll for word
* modifications be sure to implement that (see ARM64 for example).
*
*/
#ifndef __ASM_GENERIC_SPINLOCK_H
#define __ASM_GENERIC_SPINLOCK_H
#include <linux/atomic.h>
#include <asm-generic/spinlock_types.h>
static __always_inline void arch_spin_lock(arch_spinlock_t *lock)
{
u32 val = atomic_fetch_add(1<<16, lock);
u16 ticket = val >> 16;
if (ticket == (u16)val)
return;
/*
* atomic_cond_read_acquire() is RCpc, but rather than defining a
* custom cond_read_rcsc() here we just emit a full fence. We only
* need the prior reads before subsequent writes ordering from
* smb_mb(), but as atomic_cond_read_acquire() just emits reads and we
* have no outstanding writes due to the atomic_fetch_add() the extra
* orderings are free.
*/
atomic_cond_read_acquire(lock, ticket == (u16)VAL);
smp_mb();
}
static __always_inline bool arch_spin_trylock(arch_spinlock_t *lock)
{
u32 old = atomic_read(lock);
if ((old >> 16) != (old & 0xffff))
return false;
return atomic_try_cmpxchg(lock, &old, old + (1<<16)); /* SC, for RCsc */
}
static __always_inline void arch_spin_unlock(arch_spinlock_t *lock)
{
u16 *ptr = (u16 *)lock + IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
u32 val = atomic_read(lock);
smp_store_release(ptr, (u16)val + 1);
}
static __always_inline int arch_spin_value_unlocked(arch_spinlock_t lock)
{
u32 val = lock.counter;
return ((val >> 16) == (val & 0xffff));
}
static __always_inline int arch_spin_is_locked(arch_spinlock_t *lock)
{
arch_spinlock_t val = READ_ONCE(*lock);
return !arch_spin_value_unlocked(val);
}
static __always_inline int arch_spin_is_contended(arch_spinlock_t *lock)
{
u32 val = atomic_read(lock);
return (s16)((val >> 16) - (val & 0xffff)) > 1;
}
#include <asm/qrwlock.h>
#endif /* __ASM_GENERIC_SPINLOCK_H */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| bitops | Folder | 0755 |
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| vdso | Folder | 0755 |
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| Kbuild | File | 1.68 KB | 0644 |
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| access_ok.h | File | 1.37 KB | 0644 |
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| archrandom.h | File | 342 B | 0644 |
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| asm-offsets.h | File | 35 B | 0644 |
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| asm-prototypes.h | File | 507 B | 0644 |
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| atomic.h | File | 3.49 KB | 0644 |
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| atomic64.h | File | 2.49 KB | 0644 |
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| audit_change_attr.h | File | 484 B | 0644 |
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| audit_dir_write.h | File | 528 B | 0644 |
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| audit_read.h | File | 241 B | 0644 |
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| audit_signal.h | File | 36 B | 0644 |
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| audit_write.h | File | 461 B | 0644 |
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| barrier.h | File | 7.13 KB | 0644 |
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| bitops.h | File | 1.13 KB | 0644 |
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| bitsperlong.h | File | 1.18 KB | 0644 |
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| bug.h | File | 6.22 KB | 0644 |
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| bugs.h | File | 267 B | 0644 |
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| cache.h | File | 384 B | 0644 |
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| cacheflush.h | File | 2.51 KB | 0644 |
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| cfi.h | File | 129 B | 0644 |
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| checksum.h | File | 1.6 KB | 0644 |
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| cmpxchg-local.h | File | 1.43 KB | 0644 |
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| cmpxchg.h | File | 2.38 KB | 0644 |
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| compat.h | File | 3.67 KB | 0644 |
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| current.h | File | 256 B | 0644 |
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| delay.h | File | 1.13 KB | 0644 |
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| device.h | File | 245 B | 0644 |
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| div64.h | File | 7.48 KB | 0644 |
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| dma-mapping.h | File | 232 B | 0644 |
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| dma.h | File | 553 B | 0644 |
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| early_ioremap.h | File | 1.47 KB | 0644 |
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| emergency-restart.h | File | 248 B | 0644 |
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| error-injection.h | File | 1.13 KB | 0644 |
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| exec.h | File | 460 B | 0644 |
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| export.h | File | 369 B | 0644 |
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| extable.h | File | 802 B | 0644 |
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| fb.h | File | 2.85 KB | 0644 |
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| fixmap.h | File | 2.86 KB | 0644 |
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| ftrace.h | File | 314 B | 0644 |
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| futex.h | File | 2.59 KB | 0644 |
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| getorder.h | File | 1.23 KB | 0644 |
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| hardirq.h | File | 568 B | 0644 |
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| hugetlb.h | File | 3.48 KB | 0644 |
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| hw_irq.h | File | 270 B | 0644 |
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| ide_iops.h | File | 791 B | 0644 |
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| int-ll64.h | File | 863 B | 0644 |
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| io.h | File | 26.38 KB | 0644 |
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| ioctl.h | File | 506 B | 0644 |
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| iomap.h | File | 3.92 KB | 0644 |
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| irq.h | File | 403 B | 0644 |
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| irq_regs.h | File | 773 B | 0644 |
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| irq_work.h | File | 194 B | 0644 |
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| irqflags.h | File | 1.51 KB | 0644 |
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| kdebug.h | File | 182 B | 0644 |
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| kmap_size.h | File | 263 B | 0644 |
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| kprobes.h | File | 833 B | 0644 |
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| kvm_para.h | File | 549 B | 0644 |
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| kvm_types.h | File | 113 B | 0644 |
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| linkage.h | File | 225 B | 0644 |
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| local.h | File | 2.31 KB | 0644 |
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| local64.h | File | 4.04 KB | 0644 |
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| logic_io.h | File | 2.35 KB | 0644 |
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| mcs_spinlock.h | File | 260 B | 0644 |
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| memory_model.h | File | 1.75 KB | 0644 |
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| mm_hooks.h | File | 753 B | 0644 |
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| mmiowb.h | File | 1.72 KB | 0644 |
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| mmiowb_types.h | File | 249 B | 0644 |
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| mmu.h | File | 449 B | 0644 |
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| mmu_context.h | File | 1.62 KB | 0644 |
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| module.h | File | 1.09 KB | 0644 |
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| module.lds.h | File | 278 B | 0644 |
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| mshyperv.h | File | 11.13 KB | 0644 |
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| msi.h | File | 1.01 KB | 0644 |
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| nommu_context.h | File | 420 B | 0644 |
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| numa.h | File | 1.6 KB | 0644 |
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| page.h | File | 2.3 KB | 0644 |
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| param.h | File | 367 B | 0644 |
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| parport.h | File | 604 B | 0644 |
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| pci.h | File | 655 B | 0644 |
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| pci_iomap.h | File | 1.96 KB | 0644 |
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| percpu.h | File | 15.2 KB | 0644 |
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| pgalloc.h | File | 5.28 KB | 0644 |
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| pgtable-nop4d.h | File | 1.72 KB | 0644 |
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| pgtable-nopmd.h | File | 1.99 KB | 0644 |
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| pgtable-nopud.h | File | 1.95 KB | 0644 |
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| pgtable_uffd.h | File | 1.03 KB | 0644 |
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| preempt.h | File | 1.95 KB | 0644 |
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| qrwlock.h | File | 3.99 KB | 0644 |
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| qrwlock_types.h | File | 683 B | 0644 |
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| qspinlock.h | File | 4.67 KB | 0644 |
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| qspinlock_types.h | File | 2.08 KB | 0644 |
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| resource.h | File | 1.07 KB | 0644 |
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| runtime-const.h | File | 414 B | 0644 |
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| rwonce.h | File | 2.86 KB | 0644 |
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| seccomp.h | File | 1.16 KB | 0644 |
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| sections.h | File | 7.16 KB | 0644 |
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| serial.h | File | 345 B | 0644 |
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| set_memory.h | File | 362 B | 0644 |
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| shmparam.h | File | 207 B | 0644 |
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| signal.h | File | 308 B | 0644 |
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| simd.h | File | 436 B | 0644 |
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| softirq_stack.h | File | 281 B | 0644 |
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| spinlock.h | File | 2.73 KB | 0644 |
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| spinlock_types.h | File | 404 B | 0644 |
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| statfs.h | File | 169 B | 0644 |
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| string.h | File | 281 B | 0644 |
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| switch_to.h | File | 755 B | 0644 |
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| syscall.h | File | 5.02 KB | 0644 |
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| syscalls.h | File | 739 B | 0644 |
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| termios.h | File | 205 B | 0644 |
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| timex.h | File | 508 B | 0644 |
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| tlb.h | File | 20.38 KB | 0644 |
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| tlbflush.h | File | 485 B | 0644 |
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| topology.h | File | 2.17 KB | 0644 |
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| trace_clock.h | File | 391 B | 0644 |
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| uaccess.h | File | 5.51 KB | 0644 |
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| unaligned.h | File | 3.32 KB | 0644 |
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| user.h | File | 242 B | 0644 |
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| vermagic.h | File | 179 B | 0644 |
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| vga.h | File | 587 B | 0644 |
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| vmlinux.lds.h | File | 32.04 KB | 0644 |
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| vtime.h | File | 52 B | 0644 |
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| word-at-a-time.h | File | 2.75 KB | 0644 |
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| xor.h | File | 14.33 KB | 0644 |
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