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| author | Paul E. McKenney <paulmck@kernel.org> | 2023-01-29 18:41:44 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2023-03-22 20:02:21 +0100 |
| commit | 02bae7a24257947fe95fcca80c78e6cb602e94bf (patch) | |
| tree | 2c8cade39b72d52e748157c284c7b47174879058 /tools/memory-model | |
| parent | tools/memory-model: Unify UNLOCK+LOCK pairings to po-unlock-lock-po (diff) | |
| download | linux-02bae7a24257947fe95fcca80c78e6cb602e94bf.tar.xz linux-02bae7a24257947fe95fcca80c78e6cb602e94bf.zip | |
tools/memory-model: Add smp_mb__after_srcu_read_unlock()
This commit adds support for smp_mb__after_srcu_read_unlock(), which,
when combined with a prior srcu_read_unlock(), implies a full memory
barrier. No ordering is guaranteed to accesses between the two, and
placing accesses between is bad practice in any case.
Tests may be found at https://github.com/paulmckrcu/litmus in files
matching manual/kernel/C-srcu-mb-*.litmus.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'tools/memory-model')
| -rw-r--r-- | tools/memory-model/linux-kernel.bell | 3 | ||||
| -rw-r--r-- | tools/memory-model/linux-kernel.cat | 3 | ||||
| -rw-r--r-- | tools/memory-model/linux-kernel.def | 1 |
3 files changed, 5 insertions, 2 deletions
diff --git a/tools/memory-model/linux-kernel.bell b/tools/memory-model/linux-kernel.bell index dc464854d28a..b92fdf7f6eeb 100644 --- a/tools/memory-model/linux-kernel.bell +++ b/tools/memory-model/linux-kernel.bell @@ -31,7 +31,8 @@ enum Barriers = 'wmb (*smp_wmb*) || 'before-atomic (*smp_mb__before_atomic*) || 'after-atomic (*smp_mb__after_atomic*) || 'after-spinlock (*smp_mb__after_spinlock*) || - 'after-unlock-lock (*smp_mb__after_unlock_lock*) + 'after-unlock-lock (*smp_mb__after_unlock_lock*) || + 'after-srcu-read-unlock (*smp_mb__after_srcu_read_unlock*) instructions F[Barriers] (* SRCU *) diff --git a/tools/memory-model/linux-kernel.cat b/tools/memory-model/linux-kernel.cat index 6e531457bb73..3a4d3b49e85c 100644 --- a/tools/memory-model/linux-kernel.cat +++ b/tools/memory-model/linux-kernel.cat @@ -49,7 +49,8 @@ let mb = ([M] ; fencerel(Mb) ; [M]) | * also affected by the fence. *) ([M] ; po-unlock-lock-po ; - [After-unlock-lock] ; po ; [M]) + [After-unlock-lock] ; po ; [M]) | + ([M] ; po? ; [Srcu-unlock] ; fencerel(After-srcu-read-unlock) ; [M]) let gp = po ; [Sync-rcu | Sync-srcu] ; po? let strong-fence = mb | gp diff --git a/tools/memory-model/linux-kernel.def b/tools/memory-model/linux-kernel.def index ef0f3c1850de..a6b6fbc9d0b2 100644 --- a/tools/memory-model/linux-kernel.def +++ b/tools/memory-model/linux-kernel.def @@ -24,6 +24,7 @@ smp_mb__before_atomic() { __fence{before-atomic}; } smp_mb__after_atomic() { __fence{after-atomic}; } smp_mb__after_spinlock() { __fence{after-spinlock}; } smp_mb__after_unlock_lock() { __fence{after-unlock-lock}; } +smp_mb__after_srcu_read_unlock() { __fence{after-srcu-read-unlock}; } barrier() { __fence{barrier}; } // Exchange |