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| author |   Bang Li <libang.linuxer@gmail.com> | 2022-03-19 10:03:16 +0800 |
|---|---|---|
| committer |   Vineet Gupta <vgupta@kernel.org> | 2022-04-18 14:47:05 -0700 |
| commit | c6ed4d84a2c49de7d6f490144cca7b4a4831fb6e (patch) | |
| tree | 8bd44a9893de75dde44a568294e510ae4aef87ab /arch/arc/kernel/smp.c | |
| parent | ARC: atomic: cleanup atomic-llsc definitions (diff) | |
| download | linux-dev-c6ed4d84a2c49de7d6f490144cca7b4a4831fb6e.tar.xz linux-dev-c6ed4d84a2c49de7d6f490144cca7b4a4831fb6e.zip | |
ARC: remove redundant READ_ONCE() in cmpxchg loop
This patch reverts commit 7082a29c22ac ("ARC: use ACCESS_ONCE in cmpxchg
loop").
It is not necessary to use READ_ONCE() because cmpxchg contains barrier. We
can get it from commit d57f727264f1 ("ARC: add compiler barrier to LLSC
based cmpxchg").
Signed-off-by: Bang Li <libang.linuxer@gmail.com>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
Diffstat (limited to 'arch/arc/kernel/smp.c')
| -rw-r--r-- | arch/arc/kernel/smp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c index 383fefee2ae5..d947473f1e6d 100644 --- a/arch/arc/kernel/smp.c +++ b/arch/arc/kernel/smp.c @@ -274,7 +274,7 @@ static void ipi_send_msg_one(int cpu, enum ipi_msg_type msg) * and read back old value */ do { - new = old = READ_ONCE(*ipi_data_ptr); + new = old = *ipi_data_ptr; new |= 1U << msg; } while (cmpxchg(ipi_data_ptr, old, new) != old); |