linux-kernel - [PATCH v4 2/3] percpu: Export per_cpu

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Message-Id: <1615967692-80524-3-git-send-email-xlpang@linux.alibaba.com>
Date:   Wed, 17 Mar 2021 15:54:51 +0800
From:   Xunlei Pang <xlpang@...ux.alibaba.com>
To:     Christoph Lameter <cl@...ux.com>, Christoph Lameter <cl@...two.de>,
        Pekka Enberg <penberg@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, Roman Gushchin <guro@...com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Shu Ming <sming56@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Wen Yang <wenyang@...ux.alibaba.com>,
        James Wang <jnwang@...ux.alibaba.com>,
        Xunlei Pang <xlpang@...ux.alibaba.com>
Subject: [PATCH v4 2/3] percpu: Export per_cpu_sum()

per_cpu_sum() is useful, and deserves to be exported.

Tested-by: James Wang <jnwang@...ux.alibaba.com>
Signed-off-by: Xunlei Pang <xlpang@...ux.alibaba.com>
---
 include/linux/percpu-defs.h   | 10 ++++++++++
 kernel/locking/percpu-rwsem.c | 10 ----------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index dff7040..0e71b68 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -220,6 +220,16 @@
 	(void)__vpp_verify;						\
 } while (0)
 
+#define per_cpu_sum(var)						\
+({									\
+	typeof(var) __sum = 0;						\
+	int cpu;							\
+	compiletime_assert_atomic_type(__sum);				\
+	for_each_possible_cpu(cpu)					\
+		__sum += per_cpu(var, cpu);				\
+	__sum;								\
+})
+
 #ifdef CONFIG_SMP
 
 /*
diff --git a/kernel/locking/percpu-rwsem.c b/kernel/locking/percpu-rwsem.c
index 70a32a5..0980e51 100644
--- a/kernel/locking/percpu-rwsem.c
+++ b/kernel/locking/percpu-rwsem.c
@@ -178,16 +178,6 @@ bool __percpu_down_read(struct percpu_rw_semaphore *sem, bool try)
 }
 EXPORT_SYMBOL_GPL(__percpu_down_read);
 
-#define per_cpu_sum(var)						\
-({									\
-	typeof(var) __sum = 0;						\
-	int cpu;							\
-	compiletime_assert_atomic_type(__sum);				\
-	for_each_possible_cpu(cpu)					\
-		__sum += per_cpu(var, cpu);				\
-	__sum;								\
-})
-
 /*
  * Return true if the modular sum of the sem->read_count per-CPU variable is
  * zero.  If this sum is zero, then it is stable due to the fact that if any
-- 
1.8.3.1