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authorPaul E. McKenney <paulmck@kernel.org>2020-11-06 20:58:01 +0300
committerPaul E. McKenney <paulmck@kernel.org>2021-01-05 01:40:49 +0300
commit8881e7a774a8d14088d6c6fde8730660f74a3642 (patch)
tree7df822e767c099adad831f3143f4151c717bfaa8 /tools/memory-model
parent5c8fe583cce542aa0b84adc939ce85293de36e5e (diff)
downloadlinux-8881e7a774a8d14088d6c6fde8730660f74a3642.tar.xz
tools/memory-model: Tie acquire loads to reads-from
This commit explicitly makes the connection between acquire loads and the reads-from relation. It also adds an entry for happens-before, and refers to the corresponding section of explanation.txt. Reported-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'tools/memory-model')
-rw-r--r--tools/memory-model/Documentation/glossary.txt12
1 files changed, 9 insertions, 3 deletions
diff --git a/tools/memory-model/Documentation/glossary.txt b/tools/memory-model/Documentation/glossary.txt
index 79acb75d56ea..b2da6365be63 100644
--- a/tools/memory-model/Documentation/glossary.txt
+++ b/tools/memory-model/Documentation/glossary.txt
@@ -33,10 +33,11 @@ Acquire: With respect to a lock, acquiring that lock, for example,
acquire loads.
When an acquire load returns the value stored by a release store
- to that same variable, then all operations preceding that store
- happen before any operations following that load acquire.
+ to that same variable, (in other words, the acquire load "reads
+ from" the release store), then all operations preceding that
+ store "happen before" any operations following that load acquire.
- See also "Relaxed" and "Release".
+ See also "Happens-Before", "Reads-From", "Relaxed", and "Release".
Coherence (co): When one CPU's store to a given variable overwrites
either the value from another CPU's store or some later value,
@@ -119,6 +120,11 @@ Fully Ordered: An operation such as smp_mb() that orders all of
that orders all of its CPU's prior accesses, itself, and
all of its CPU's subsequent accesses.
+Happens-Before (hb): A relation between two accesses in which LKMM
+ guarantees the first access precedes the second. For more
+ detail, please see the "THE HAPPENS-BEFORE RELATION: hb"
+ section of explanation.txt.
+
Marked Access: An access to a variable that uses an special function or
macro such as "r1 = READ_ONCE(x)" or "smp_store_release(&a, 1)".