[PATCH 1/2] percpu: Add __this_cpu_try_cmpxchg()

Uros Bizjak
2024-05-23T08:01:42Z

Add __this_cpu_try_cmpxchg() version of the percpu op.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Uladzislau Rezki <urezki@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
---
include/linux/percpu-defs.h | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index ec3573119923..8efce7414fad 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -475,6 +475,12 @@ do { \
raw_cpu_cmpxchg(pcp, oval, nval); \
})

+#define __this_cpu_try_cmpxchg(pcp, ovalp, nval) \
+({ \
+ __this_cpu_preempt_check("try_cmpxchg"); \
+ raw_cpu_try_cmpxchg(pcp, ovalp, nval); \
+})
+
#define __this_cpu_sub(pcp, val) __this_cpu_add(pcp, -(typeof(pcp))(val))
#define __this_cpu_inc(pcp) __this_cpu_add(pcp, 1)
#define __this_cpu_dec(pcp) __this_cpu_sub(pcp, 1)
--
2.45.1