| /openbmc/linux/lib/ |
| H A D | locking-selftest.c | 3 * lib/locking-selftest.c
5 * Testsuite for various locking APIs: spinlocks, rwlocks,
309 #include "locking-selftest-spin.h"
311 #include "locking-selftest-wlock.h"
313 #include "locking-selftest-rlock.h"
315 #include "locking-selftest-mutex.h"
317 #include "locking-selftest-wsem.h"
319 #include "locking-selftest-rsem.h"
323 #include "locking-selftest-rtmutex.h"
330 * Special-case for read-locking, they are
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| /openbmc/linux/kernel/locking/ |
| H A D | lock_events_list.h | 23 * Locking events for PV qspinlock.
39 * Locking events for qspinlock
44 LOCK_EVENT(lock_pending) /* # of locking ops via pending code */
45 LOCK_EVENT(lock_slowpath) /* # of locking ops via MCS lock queue */
46 LOCK_EVENT(lock_use_node2) /* # of locking ops that use 2nd percpu node */
47 LOCK_EVENT(lock_use_node3) /* # of locking ops that use 3rd percpu node */
48 LOCK_EVENT(lock_use_node4) /* # of locking ops that use 4th percpu node */
49 LOCK_EVENT(lock_no_node) /* # of locking ops w/o using percpu node */
53 * Locking events for rwsem
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| /openbmc/linux/tools/memory-model/Documentation/ |
| H A D | simple.txt | 39 This approach is called "code locking".
41 Code locking can severely limit both performance and scalability, so it
47 One of the advantages of locking is that, in happy contrast with the
48 year 1981, almost all kernel developers are very familiar with locking.
52 Please use the standard locking primitives provided by the kernel rather
58 locking functions must carefully prevent both the CPU and the compiler
59 from moving code in either direction across the locking function.
86 Data locking
89 With code locking, we use single-threaded code execution to guarantee
104 As the number of buckets increases, data locking scales naturally.
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| H A D | locking.txt | 1 Locking
4 Locking is well-known and the common use cases are straightforward: Any
13 Locking and Prior Accesses
16 The basic rule of locking is worth repeating:
50 Locking and Subsequent Accesses
82 locking basic rule extend across multiple acquisitions of a given lock
86 Double-Checked Locking
90 double-checked locking work correctly, This litmus test illustrates
93 /* See Documentation/litmus-tests/locking/DCL-broken.litmus. */
118 /* See Documentation/litmus-tests/locking/DCL-fixed.litmus. */
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| /openbmc/linux/drivers/iio/accel/ |
| H A D | mma9551_core.c | 210 * Locking note: This function must be called with the device lock held.
211 * Locking is not handled inside the function. Callers should ensure they
235 * Locking note: This function must be called with the device lock held.
236 * Locking is not handled inside the function. Callers should ensure they
260 * Locking note: This function must be called with the device lock held.
261 * Locking is not handled inside the function. Callers should ensure they
285 * Locking note: This function must be called with the device lock held.
286 * Locking is not handled inside the function. Callers should ensure they
319 * Locking note: This function must be called with the device lock held.
320 * Locking is not handled inside the function. Callers should ensure they
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| /openbmc/linux/Documentation/filesystems/ |
| H A D | directory-locking.rst | 2 Directory Locking
6 Locking scheme used for directory operations is based on two
16 1) read access. Locking rules: caller locks directory we are accessing.
19 2) object creation. Locking rules: same as above, but the lock is taken
22 3) object removal. Locking rules: caller locks parent, finds victim,
25 4) rename() that is _not_ cross-directory. Locking rules: caller locks
36 5) link creation. Locking rules:
45 6) cross-directory rename. The trickiest in the whole bunch. Locking
123 But locking rules for cross-directory rename guarantee that we do not
139 While this locking scheme works for arbitrary DAGs, it relies on
|
| H A D | dlmfs.rst | 41 dlmfs for easy to setup and easy to use clustered locking in
64 Locking chapter
69 system calls and presents a more traditional locking api.
74 locking.
94 domain directory. Locking against them is done via the open(2) system
113 Open Flag Resulting Locking Behavior
140 For more information on the VMS distributed locking API.
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| /openbmc/linux/Documentation/locking/ |
| H A D | lockdep-design.rst | 1 Runtime locking correctness validator
14 respect to locking rules, even if the locks may have multiple (possibly
51 where the n STATEs are coded in kernel/locking/lockdep_states.h and as of
61 When locking rules are violated, these usage bits are presented in the
62 locking error messages, inside curlies, with a total of 2 * n STATEs bits.
152 i.e., there can be any other locking sequence between the acquire-lock
168 The above rules are enforced for any locking sequence that occurs in the
192 Exception: Nested data dependencies leading to nested locking
202 An example of such an object hierarchy that results in "nested locking"
207 automatically detect this natural ordering, as the locking rule behind
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| H A D | preempt-locking.rst | 2 Proper Locking Under a Preemptible Kernel: Keeping Kernel Code Preempt-Safe
12 A preemptible kernel creates new locking issues. The issues are the same as
14 kernel model leverages existing SMP locking mechanisms. Thus, the kernel
15 requires explicit additional locking for very few additional situations.
32 First, since the data is per-CPU, it may not have explicit SMP locking, but
132 in doubt, rely on locking or explicit preemption disabling.
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| H A D | percpu-rw-semaphore.rst | 6 optimized for locking for reading.
13 Locking for reading is very fast, it uses RCU and it avoids any atomic
14 instruction in the lock and unlock path. On the other hand, locking for
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| /openbmc/linux/include/linux/ |
| H A D | kfifo.h | 30 * Note about locking: There is no locking required until only one reader
251 * a spinlock for locking
253 * @lock: spinlock to be used for locking
267 * using a spinlock for locking, doesn't disable interrupts
269 * @lock: spinlock to be used for locking
403 * writer, you don't need extra locking to use these macro.
440 * writer, you don't need extra locking to use these macro.
479 * writer, you don't need extra locking to use these macro.
517 * writer, you don't need extra locking to use these macro.
532 * kfifo_in_spinlocked - put data into the fifo using a spinlock for locking
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| H A D | seqlock.h | 9 * See Documentation/locking/seqlock.rst
55 * locking primitives, use a sequence counter with associated lock
62 * See Documentation/locking/seqlock.rst
131 * See Documentation/locking/seqlock.rst
148 * sleeping locks. See Documentation/locking/locktypes.rst
500 * See Documentation/locking/lockdep-design.rst
851 * - Documentation/locking/seqlock.rst
1042 * read_seqlock_excl() - begin a seqlock_t locking reader section
1045 * read_seqlock_excl opens a seqlock_t locking reader critical section. A
1046 * locking reader exclusively locks out *both* other writers *and* other
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| H A D | serial_core.h | 48 * Locking: none.
67 * Locking: @port->lock taken.
87 * Locking: @port->lock taken.
99 * Locking: @port->lock taken.
107 * Locking: @port->lock taken.
118 * Locking: serialized with @unthrottle() and termios modification by the
129 * Locking: serialized with @throttle() and termios modification by the
142 * Locking: none.
149 * Locking: @port->lock taken.
157 * Locking: @port->lock taken.
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| /openbmc/linux/tools/testing/selftests/net/forwarding/ |
| H A D | bridge_locked_port.sh | 100 check_err $? "Ping did not work before locking port"
105 check_fail $? "Ping worked after locking port, but before adding FDB entry"
110 check_err $? "Ping did not work after locking port and adding FDB entry"
131 check_err $? "Ping through vlan did not work before locking port"
135 check_fail $? "Ping through vlan worked after locking port, but before adding FDB entry"
140 check_err $? "Ping through vlan did not work after locking port and adding FDB entry"
159 check_err $? "Ping6 did not work before locking port"
164 check_fail $? "Ping6 worked after locking port, but before adding FDB entry"
168 check_err $? "Ping6 did not work after locking port and adding FDB entry"
185 check_err $? "Ping did not work before locking port"
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| /openbmc/linux/tools/testing/selftests/drivers/net/dsa/ |
| H A D | bridge_locked_port.sh | 100 check_err $? "Ping did not work before locking port"
105 check_fail $? "Ping worked after locking port, but before adding FDB entry"
110 check_err $? "Ping did not work after locking port and adding FDB entry"
131 check_err $? "Ping through vlan did not work before locking port"
135 check_fail $? "Ping through vlan worked after locking port, but before adding FDB entry"
140 check_err $? "Ping through vlan did not work after locking port and adding FDB entry"
159 check_err $? "Ping6 did not work before locking port"
164 check_fail $? "Ping6 worked after locking port, but before adding FDB entry"
168 check_err $? "Ping6 did not work after locking port and adding FDB entry"
185 check_err $? "Ping did not work before locking port"
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| /openbmc/linux/fs/gfs2/ |
| H A D | Kconfig | 22 the locking module below. Documentation and utilities for GFS2 can
29 bool "GFS2 DLM locking"
33 Multiple node locking module for GFS2
35 Most users of GFS2 will require this. It provides the locking
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| /openbmc/qemu/tests/qemu-iotests/ |
| H A D | 182 | 4 # Test image locking for POSIX locks
52 _launch_qemu -drive file=$TEST_IMG,if=none,id=drive0,file.locking=on \
58 -drive file=$TEST_IMG,if=none,id=drive0,file.locking=on \
90 'locking': 'on'
116 'locking': 'on'
151 _launch_qemu -drive file=$TEST_IMG,if=none,file.locking=on
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| /openbmc/linux/fs/ocfs2/ |
| H A D | ocfs2_lockingver.h | 5 * Defines OCFS2 Locking version values.
14 * The protocol version for ocfs2 cluster locking. See dlmglue.c for
17 * 1.0 - Initial locking version from ocfs2 1.4.
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| /openbmc/linux/drivers/ata/ |
| H A D | libata-sff.c | 61 * LOCKING:
81 * LOCKING:
113 * LOCKING:
136 * LOCKING:
153 * LOCKING:
202 * LOCKING:
224 * LOCKING:
252 * LOCKING:
284 * LOCKING:
312 * LOCKING:
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| /openbmc/linux/block/ |
| H A D | opal_proto.h | 187 /* locking tokens */
197 /* locking info table */
218 /* Locking state for a locking range */
328 * Locking Feature Descriptor. Contains flags indicating support for the
329 * locking features described in the OPAL specification. The names match the
342 * bit 1: locking enabled
343 * bit 0: locking supported
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| /openbmc/openbmc/poky/documentation/dev-manual/ |
| H A D | bblock.rst | 3 Locking and Unlocking Recipes Using ``bblock``
32 Locking tasks and recipes
43 Locking a recipe means locking all tasks of the recipe. If you need to
83 Locking mechanism
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| /openbmc/phosphor-host-ipmid/user_channel/ |
| H A D | shadowlock.hpp | 20 * @brief Responsible for locking and unlocking /etc/shadow
35 lg2::error("Locking Shadow failed"); in Lock()
43 lg2::error("Un-Locking Shadow failed"); in ~Lock()
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| /openbmc/linux/Documentation/kernel-hacking/ |
| H A D | locking.rst | 4 Unreliable Guide To Locking
12 Welcome, to Rusty's Remarkably Unreliable Guide to Kernel Locking
13 issues. This document describes the locking systems in the Linux Kernel
18 fundamentals of concurrency and locking for SMP.
94 Locking in the Linux Kernel
97 If I could give you one piece of advice on locking: **keep it simple**.
134 You should always test your locking code with ``CONFIG_SMP`` and
136 because it will still catch some kinds of locking bugs.
141 Locking Only In User Context
161 Locking Between User Context and Softirqs
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| /openbmc/linux/drivers/dma/ |
| H A D | dmaengine.h | 66 * non-NULL. No locking is required.
111 * No locking is required.
129 * Locking is dependent on the driver.
157 * Locking is dependent on the driver.
174 * No locking is required.
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| /openbmc/linux/Documentation/networking/devlink/ |
| H A D | index.rst | 7 Locking chapter
11 locking. Drivers can use the existing ``devlink_*`` set of APIs, or
12 new APIs prefixed by ``devl_*``. The older APIs handle all the locking
|