user/sven/linux.git/include/linux/semaphore.h, branch v5.7

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 436

2019-06-05T15:37:17Z

Based on 1 normalized pattern(s): distributed under the terms of the gnu gpl version 2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 2 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Armijn Hemel Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190115.032570679@linutronix.de Signed-off-by: Greg Kroah-Hartman

locking/semaphore: Update the file path in documentation

2018-02-13T14:00:06Z

While reading this header I noticed that the locking stuff has moved to kernel/locking/*, so update the path in semaphore.h to point to that. Signed-off-by: Tycho Andersen Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/20180201114119.1090-1-tycho@tycho.ws Signed-off-by: Ingo Molnar

locking, semaphores: Annotate inner lock as raw

2011-09-13T09:11:57Z

There is no reason to have the spin_lock protecting the semaphore preemptible on -rt. Annotate it as a raw_spinlock. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. ( On rt this also solves lockdep complaining about the rt_mutex.wait_lock being not initialized. ) Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar

semaphore: Remove mutex emulation

2010-10-30T10:12:50Z

Semaphores used as mutexes have been deprecated for years. Now that all users are either converted to real semaphores or to mutexes remove the cruft. Signed-off-by: Thomas Gleixner Cc: Peter Zijlstra Cc: Christoph Hellwig LKML-Reference: <20100907125057.562399240@linutronix.de>

semaphore: Add DEFINE_SEMAPHORE

2010-09-08T13:04:10Z

The full cleanup of init_MUTEX[_LOCKED] and DECLARE_MUTEX has not been done. Some of the users are real semaphores and we should name them as such instead of confusing everyone with "MUTEX". Provide the infrastructure to get finally rid of init_MUTEX[_LOCKED] and DECLARE_MUTEX. Signed-off-by: Thomas Gleixner Cc: Peter Zijlstra Cc: Christoph Hellwig LKML-Reference: <20100907125054.795929962@linutronix.de>

Remove __DECLARE_SEMAPHORE_GENERIC

2008-07-24T12:31:21Z

There are no users of __DECLARE_SEMAPHORE_GENERIC in the kernel Signed-off-by: Matthew Wilcox

Improve semaphore documentation

2008-04-17T14:43:01Z

Move documentation from semaphore.h to semaphore.c as requested by Andrew Morton. Also reformat to kernel-doc style and add some more notes about the implementation. Signed-off-by: Matthew Wilcox

Simplify semaphore implementation

2008-04-17T14:42:54Z

By removing the negative values of 'count' and relying on the wait_list to indicate whether we have any waiters, we can simplify the implementation by removing the protection against an unlikely race condition. Thanks to David Howells for his suggestions. Signed-off-by: Matthew Wilcox

Add down_timeout and change ACPI to use it

2008-04-17T14:42:46Z

ACPI currently emulates a timeout for semaphores with calls to down_trylock and sleep. This produces horrible behaviour in terms of fairness and excessive wakeups. Now that we have a unified semaphore implementation, adding a real down_trylock is almost trivial. Signed-off-by: Matthew Wilcox

Introduce down_killable()

2008-04-17T14:42:40Z

down_killable() is the functional counterpart of mutex_lock_killable. Signed-off-by: Matthew Wilcox