From: Uros Bizjak <ubizjak@gmail.com>
Date: Tue, 28 May 2024 14:43:13 +0000 (+0200)
Subject: percpu: add __this_cpu_try_cmpxchg()
X-Git-Tag: v6.11-rc1~85^2~340
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=21664442be1bf79094dd9d21b8833acbfbd80ea7;p=thirdparty%2Flinux.git

percpu: add __this_cpu_try_cmpxchg()

Add __this_cpu_try_cmpxchg() version of the percpu op.

Link: https://lkml.kernel.org/r/20240528144345.5980-1-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Acked-by: Dennis Zhou <dennis@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index ec35731199234..8efce7414fad6 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)