diff options
| author |   Peter Zijlstra <peterz@infradead.org> | 2016-04-18 01:16:03 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2016-06-16 10:48:30 +0200 |
| commit | 1af5de9af138941fb8638cf126293b16f3387de4 (patch) | |
| tree | 55b1f10f549b59c7e6442505905496a9e822ce36 /arch/tile/lib/atomic_asm_32.S | |
| parent | locking/atomic, arch/sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() (diff) | |
| download | linux-dev-1af5de9af138941fb8638cf126293b16f3387de4.tar.xz linux-dev-1af5de9af138941fb8638cf126293b16f3387de4.zip | |
locking/atomic, arch/tile: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()
Implement FETCH-OP atomic primitives, these are very similar to the
existing OP-RETURN primitives we already have, except they return the
value of the atomic variable _before_ modification.
This is especially useful for irreversible operations -- such as
bitops (because it becomes impossible to reconstruct the state prior
to modification).
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/tile/lib/atomic_asm_32.S | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/tile/lib/atomic_asm_32.S b/arch/tile/lib/atomic_asm_32.S index f611265633d6..507abdd2bf9a 100644 --- a/arch/tile/lib/atomic_asm_32.S +++ b/arch/tile/lib/atomic_asm_32.S @@ -177,10 +177,10 @@ atomic_op _xchg, 32, "move r24, r2" atomic_op _xchg_add, 32, "add r24, r22, r2" atomic_op _xchg_add_unless, 32, \ "sne r26, r22, r2; { bbns r26, 3f; add r24, r22, r3 }" -atomic_op _or, 32, "or r24, r22, r2" -atomic_op _and, 32, "and r24, r22, r2" -atomic_op _andn, 32, "nor r2, r2, zero; and r24, r22, r2" -atomic_op _xor, 32, "xor r24, r22, r2" +atomic_op _fetch_or, 32, "or r24, r22, r2" +atomic_op _fetch_and, 32, "and r24, r22, r2" +atomic_op _fetch_andn, 32, "nor r2, r2, zero; and r24, r22, r2" +atomic_op _fetch_xor, 32, "xor r24, r22, r2" atomic_op 64_cmpxchg, 64, "{ seq r26, r22, r2; seq r27, r23, r3 }; \ { bbns r26, 3f; move r24, r4 }; { bbns r27, 3f; move r25, r5 }" @@ -192,9 +192,9 @@ atomic_op 64_xchg_add_unless, 64, \ { bbns r26, 3f; add r24, r22, r4 }; \ { bbns r27, 3f; add r25, r23, r5 }; \ slt_u r26, r24, r22; add r25, r25, r26" -atomic_op 64_or, 64, "{ or r24, r22, r2; or r25, r23, r3 }" -atomic_op 64_and, 64, "{ and r24, r22, r2; and r25, r23, r3 }" -atomic_op 64_xor, 64, "{ xor r24, r22, r2; xor r25, r23, r3 }" +atomic_op 64_fetch_or, 64, "{ or r24, r22, r2; or r25, r23, r3 }" +atomic_op 64_fetch_and, 64, "{ and r24, r22, r2; and r25, r23, r3 }" +atomic_op 64_fetch_xor, 64, "{ xor r24, r22, r2; xor r25, r23, r3 }" jrp lr /* happy backtracer */ |