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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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7ff495e26a
local_lock.h is the main header for the local_lock_t type and provides wrappers around internal functions prefixed with __ in local_lock_internal.h. Move the this_cpu_ptr() dereference of the variable from the internal to the main header. Since it is all macro implemented, this_cpu_ptr() will still happen within the preempt/ IRQ disabled section. This frees the internal implementation (__) to be used on local_lock_t types which are local variables and must not be accessed via this_cpu_ptr(). Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Waiman Long <longman@redhat.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/all/20250630075138.3448715-2-bigeasy@linutronix.de
104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_LOCAL_LOCK_H
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#define _LINUX_LOCAL_LOCK_H
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#include <linux/local_lock_internal.h>
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/**
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* local_lock_init - Runtime initialize a lock instance
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*/
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#define local_lock_init(lock) __local_lock_init(lock)
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/**
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* local_lock - Acquire a per CPU local lock
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* @lock: The lock variable
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*/
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#define local_lock(lock) __local_lock(this_cpu_ptr(lock))
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/**
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* local_lock_irq - Acquire a per CPU local lock and disable interrupts
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* @lock: The lock variable
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*/
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#define local_lock_irq(lock) __local_lock_irq(this_cpu_ptr(lock))
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/**
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* local_lock_irqsave - Acquire a per CPU local lock, save and disable
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* interrupts
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* @lock: The lock variable
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* @flags: Storage for interrupt flags
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*/
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#define local_lock_irqsave(lock, flags) \
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__local_lock_irqsave(this_cpu_ptr(lock), flags)
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/**
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* local_unlock - Release a per CPU local lock
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* @lock: The lock variable
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*/
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#define local_unlock(lock) __local_unlock(this_cpu_ptr(lock))
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/**
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* local_unlock_irq - Release a per CPU local lock and enable interrupts
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* @lock: The lock variable
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*/
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#define local_unlock_irq(lock) __local_unlock_irq(this_cpu_ptr(lock))
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/**
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* local_unlock_irqrestore - Release a per CPU local lock and restore
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* interrupt flags
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* @lock: The lock variable
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* @flags: Interrupt flags to restore
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*/
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#define local_unlock_irqrestore(lock, flags) \
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__local_unlock_irqrestore(this_cpu_ptr(lock), flags)
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/**
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* local_lock_init - Runtime initialize a lock instance
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*/
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#define local_trylock_init(lock) __local_trylock_init(lock)
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/**
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* local_trylock - Try to acquire a per CPU local lock
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* @lock: The lock variable
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*
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* The function can be used in any context such as NMI or HARDIRQ. Due to
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* locking constrains it will _always_ fail to acquire the lock in NMI or
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* HARDIRQ context on PREEMPT_RT.
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*/
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#define local_trylock(lock) __local_trylock(this_cpu_ptr(lock))
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/**
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* local_trylock_irqsave - Try to acquire a per CPU local lock, save and disable
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* interrupts if acquired
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* @lock: The lock variable
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* @flags: Storage for interrupt flags
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*
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* The function can be used in any context such as NMI or HARDIRQ. Due to
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* locking constrains it will _always_ fail to acquire the lock in NMI or
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* HARDIRQ context on PREEMPT_RT.
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*/
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#define local_trylock_irqsave(lock, flags) \
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__local_trylock_irqsave(this_cpu_ptr(lock), flags)
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DEFINE_GUARD(local_lock, local_lock_t __percpu*,
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local_lock(_T),
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local_unlock(_T))
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DEFINE_GUARD(local_lock_irq, local_lock_t __percpu*,
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local_lock_irq(_T),
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local_unlock_irq(_T))
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DEFINE_LOCK_GUARD_1(local_lock_irqsave, local_lock_t __percpu,
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local_lock_irqsave(_T->lock, _T->flags),
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local_unlock_irqrestore(_T->lock, _T->flags),
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unsigned long flags)
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#define local_lock_nested_bh(_lock) \
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__local_lock_nested_bh(this_cpu_ptr(_lock))
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#define local_unlock_nested_bh(_lock) \
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__local_unlock_nested_bh(this_cpu_ptr(_lock))
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DEFINE_GUARD(local_lock_nested_bh, local_lock_t __percpu*,
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local_lock_nested_bh(_T),
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local_unlock_nested_bh(_T))
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#endif
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