forked from luck/tmp_suning_uos_patched
0ce0c78eff
This commit adds a key entry enumerating the various types of relaxed operations. While in the area, it also renames the relaxed rows. [ paulmck: Apply Boqun Feng feedback. ] Acked-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
36 lines
2.0 KiB
Plaintext
36 lines
2.0 KiB
Plaintext
Prior Operation Subsequent Operation
|
|
--------------- ---------------------------
|
|
C Self R W RMW Self R W DR DW RMW SV
|
|
-- ---- - - --- ---- - - -- -- --- --
|
|
|
|
Relaxed store Y Y
|
|
Relaxed load Y Y Y Y
|
|
Relaxed RMW operation Y Y Y Y
|
|
rcu_dereference() Y Y Y Y
|
|
Successful *_acquire() R Y Y Y Y Y Y
|
|
Successful *_release() C Y Y Y W Y
|
|
smp_rmb() Y R Y Y R
|
|
smp_wmb() Y W Y Y W
|
|
smp_mb() & synchronize_rcu() CP Y Y Y Y Y Y Y Y
|
|
Successful full non-void RMW CP Y Y Y Y Y Y Y Y Y Y Y
|
|
smp_mb__before_atomic() CP Y Y Y a a a a Y
|
|
smp_mb__after_atomic() CP a a Y Y Y Y Y Y
|
|
|
|
|
|
Key: Relaxed: A relaxed operation is either READ_ONCE(), WRITE_ONCE(),
|
|
a *_relaxed() RMW operation, an unsuccessful RMW
|
|
operation, a non-value-returning RMW operation such
|
|
as atomic_inc(), or one of the atomic*_read() and
|
|
atomic*_set() family of operations.
|
|
C: Ordering is cumulative
|
|
P: Ordering propagates
|
|
R: Read, for example, READ_ONCE(), or read portion of RMW
|
|
W: Write, for example, WRITE_ONCE(), or write portion of RMW
|
|
Y: Provides ordering
|
|
a: Provides ordering given intervening RMW atomic operation
|
|
DR: Dependent read (address dependency)
|
|
DW: Dependent write (address, data, or control dependency)
|
|
RMW: Atomic read-modify-write operation
|
|
SELF: Orders self, as opposed to accesses before and/or after
|
|
SV: Orders later accesses to the same variable
|