From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- tools/memory-model/Documentation/cheatsheet.txt | 35 +++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 tools/memory-model/Documentation/cheatsheet.txt (limited to 'tools/memory-model/Documentation/cheatsheet.txt') diff --git a/tools/memory-model/Documentation/cheatsheet.txt b/tools/memory-model/Documentation/cheatsheet.txt new file mode 100644 index 000000000..99d00870b --- /dev/null +++ b/tools/memory-model/Documentation/cheatsheet.txt @@ -0,0 +1,35 @@ + 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 -- cgit v1.2.3