diff options
| author | Puranjay Mohan <puranjay@kernel.org> | 2024-05-14 09:46:33 +0000 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2025-02-20 07:40:23 -0800 |
| commit | e176ebffc3f4a18b79f295fd9c322e936bc14592 (patch) | |
| tree | 3569b326e6d06129643eba9a7e908ffdb7f56661 /tools/memory-model | |
| parent | 2ada0addbdb68387074a72fe5530e5d49da9a147 (diff) | |
tools/memory-model: Add atomic_andnot() with its variants
Pull-855[1] added the support of atomic_andnot() to the herd tool. Use
this to add the implementation in the LKMM. All of the ordering variants
are also added.
Here is a small litmus-test that uses this operation:
C andnot
{
atomic_t u = ATOMIC_INIT(7);
}
P0(atomic_t *u)
{
r0 = atomic_fetch_andnot(3, u);
r1 = READ_ONCE(*u);
}
exists (0:r0=7 /\ 0:r1=4)
Test andnot Allowed
States 1
0:r0=7; 0:r1=4;
Ok
Witnesses
Positive: 1 Negative: 0
Condition exists (0:r0=7 /\ 0:r1=4)
Observation andnot Always 1 0
Time andnot 0.00
Hash=78f011a0b5a0c65fa1cf106fcd62c845
[1] https://github.com/herd/herdtools7/pull/855
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Acked-by: Andrea Parri <parri.andrea@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Will Deacon <will@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Jade Alglave <j.alglave@ucl.ac.uk>
Cc: Luc Maranget <luc.maranget@inria.fr>
Cc: Akira Yokosawa <akiyks@gmail.com>
Cc: Daniel Lustig <dlustig@nvidia.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: <linux-arch@vger.kernel.org>
Diffstat (limited to 'tools/memory-model')
| -rw-r--r-- | tools/memory-model/linux-kernel.def | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/memory-model/linux-kernel.def b/tools/memory-model/linux-kernel.def index d1f11930ec51..a12b96c547b7 100644 --- a/tools/memory-model/linux-kernel.def +++ b/tools/memory-model/linux-kernel.def @@ -70,6 +70,7 @@ atomic_or(V,X) { __atomic_op(X,|,V); } atomic_xor(V,X) { __atomic_op(X,^,V); } atomic_inc(X) { __atomic_op(X,+,1); } atomic_dec(X) { __atomic_op(X,-,1); } +atomic_andnot(V,X) { __atomic_op(X,&~,V); } atomic_add_return(V,X) __atomic_op_return{mb}(X,+,V) atomic_add_return_relaxed(V,X) __atomic_op_return{once}(X,+,V) @@ -138,3 +139,8 @@ atomic_add_negative(V,X) __atomic_op_return{mb}(X,+,V) < 0 atomic_add_negative_relaxed(V,X) __atomic_op_return{once}(X,+,V) < 0 atomic_add_negative_acquire(V,X) __atomic_op_return{acquire}(X,+,V) < 0 atomic_add_negative_release(V,X) __atomic_op_return{release}(X,+,V) < 0 + +atomic_fetch_andnot(V,X) __atomic_fetch_op{mb}(X,&~,V) +atomic_fetch_andnot_acquire(V,X) __atomic_fetch_op{acquire}(X,&~,V) +atomic_fetch_andnot_release(V,X) __atomic_fetch_op{release}(X,&~,V) +atomic_fetch_andnot_relaxed(V,X) __atomic_fetch_op{once}(X,&~,V) |