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4a57d6bbae
In preparation for converting bit_spin_lock to rwlock in zsmalloc so that multiple writers of zspages can run at the same time but those zspages are supposed to be different zspage instance. Thus, it's not deadlock. This patch adds write_lock_nested to support the case for LOCKDEP. [minchan@kernel.org: fix write_lock_nested for RT] Link: https://lkml.kernel.org/r/YZfrMTAXV56HFWJY@google.com [bigeasy@linutronix.de: fixup write_lock_nested() implementation] Link: https://lkml.kernel.org/r/20211123170134.y6xb7pmpgdn4m3bn@linutronix.de Link: https://lkml.kernel.org/r/20211115185909.3949505-8-minchan@kernel.org Signed-off-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Mike Galbraith <umgwanakikbuti@gmail.com> Cc: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Naresh Kamboju <naresh.kamboju@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
92 lines
3.4 KiB
C
92 lines
3.4 KiB
C
#ifndef __LINUX_SPINLOCK_API_UP_H
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#define __LINUX_SPINLOCK_API_UP_H
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#ifndef __LINUX_SPINLOCK_H
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# error "please don't include this file directly"
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#endif
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/*
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* include/linux/spinlock_api_up.h
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*
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* spinlock API implementation on UP-nondebug (inlined implementation)
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*
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* portions Copyright 2005, Red Hat, Inc., Ingo Molnar
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* Released under the General Public License (GPL).
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*/
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#define in_lock_functions(ADDR) 0
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#define assert_raw_spin_locked(lock) do { (void)(lock); } while (0)
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/*
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* In the UP-nondebug case there's no real locking going on, so the
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* only thing we have to do is to keep the preempt counts and irq
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* flags straight, to suppress compiler warnings of unused lock
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* variables, and to add the proper checker annotations:
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*/
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#define ___LOCK(lock) \
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do { __acquire(lock); (void)(lock); } while (0)
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#define __LOCK(lock) \
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do { preempt_disable(); ___LOCK(lock); } while (0)
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#define __LOCK_BH(lock) \
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do { __local_bh_disable_ip(_THIS_IP_, SOFTIRQ_LOCK_OFFSET); ___LOCK(lock); } while (0)
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#define __LOCK_IRQ(lock) \
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do { local_irq_disable(); __LOCK(lock); } while (0)
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#define __LOCK_IRQSAVE(lock, flags) \
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do { local_irq_save(flags); __LOCK(lock); } while (0)
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#define ___UNLOCK(lock) \
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do { __release(lock); (void)(lock); } while (0)
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#define __UNLOCK(lock) \
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do { preempt_enable(); ___UNLOCK(lock); } while (0)
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#define __UNLOCK_BH(lock) \
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do { __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_LOCK_OFFSET); \
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___UNLOCK(lock); } while (0)
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#define __UNLOCK_IRQ(lock) \
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do { local_irq_enable(); __UNLOCK(lock); } while (0)
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#define __UNLOCK_IRQRESTORE(lock, flags) \
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do { local_irq_restore(flags); __UNLOCK(lock); } while (0)
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#define _raw_spin_lock(lock) __LOCK(lock)
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#define _raw_spin_lock_nested(lock, subclass) __LOCK(lock)
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#define _raw_read_lock(lock) __LOCK(lock)
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#define _raw_write_lock(lock) __LOCK(lock)
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#define _raw_write_lock_nested(lock, subclass) __LOCK(lock)
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#define _raw_spin_lock_bh(lock) __LOCK_BH(lock)
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#define _raw_read_lock_bh(lock) __LOCK_BH(lock)
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#define _raw_write_lock_bh(lock) __LOCK_BH(lock)
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#define _raw_spin_lock_irq(lock) __LOCK_IRQ(lock)
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#define _raw_read_lock_irq(lock) __LOCK_IRQ(lock)
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#define _raw_write_lock_irq(lock) __LOCK_IRQ(lock)
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#define _raw_spin_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags)
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#define _raw_read_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags)
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#define _raw_write_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags)
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#define _raw_spin_trylock(lock) ({ __LOCK(lock); 1; })
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#define _raw_read_trylock(lock) ({ __LOCK(lock); 1; })
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#define _raw_write_trylock(lock) ({ __LOCK(lock); 1; })
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#define _raw_spin_trylock_bh(lock) ({ __LOCK_BH(lock); 1; })
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#define _raw_spin_unlock(lock) __UNLOCK(lock)
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#define _raw_read_unlock(lock) __UNLOCK(lock)
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#define _raw_write_unlock(lock) __UNLOCK(lock)
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#define _raw_spin_unlock_bh(lock) __UNLOCK_BH(lock)
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#define _raw_write_unlock_bh(lock) __UNLOCK_BH(lock)
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#define _raw_read_unlock_bh(lock) __UNLOCK_BH(lock)
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#define _raw_spin_unlock_irq(lock) __UNLOCK_IRQ(lock)
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#define _raw_read_unlock_irq(lock) __UNLOCK_IRQ(lock)
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#define _raw_write_unlock_irq(lock) __UNLOCK_IRQ(lock)
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#define _raw_spin_unlock_irqrestore(lock, flags) \
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__UNLOCK_IRQRESTORE(lock, flags)
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#define _raw_read_unlock_irqrestore(lock, flags) \
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__UNLOCK_IRQRESTORE(lock, flags)
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#define _raw_write_unlock_irqrestore(lock, flags) \
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__UNLOCK_IRQRESTORE(lock, flags)
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#endif /* __LINUX_SPINLOCK_API_UP_H */
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