Received-SPF: pass (google.com: domain of linux-kernel+bounces-187135-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
From: Uros Bizjak <ubizjak@gmail.com>
To: linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Cc: Uros Bizjak <ubizjak@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Uladzislau Rezki <urezki@gmail.com>,
	Christoph Hellwig <hch@infradead.org>,
	Lorenzo Stoakes <lstoakes@gmail.com>,
	Dennis Zhou <dennis@kernel.org>,
	Tejun Heo <tj@kernel.org>,
	Christoph Lameter <cl@linux.com>
Subject: [PATCH 1/2] percpu: Add __this_cpu_try_cmpxchg()
Date: Thu, 23 May 2024 10:00:31 +0200
Message-ID: <20240523080136.9863-1-ubizjak@gmail.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

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