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From: Xunlei Pang <xlpang@linux.alibaba.com>
To: Christoph Lameter <cl@linux.com>,
	Christoph Lameter <cl@gentwo.de>,
	Pekka Enberg <penberg@kernel.org>,
	Vlastimil Babka <vbabka@suse.cz>, Roman Gushchin <guro@fb.com>,
	Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
	David Rientjes <rientjes@google.com>,
	Matthew Wilcox <willy@infradead.org>,
	Shu Ming <sming56@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Wen Yang <wenyang@linux.alibaba.com>,
	James Wang <jnwang@linux.alibaba.com>,
	Xunlei Pang <xlpang@linux.alibaba.com>
Subject: [PATCH v4 2/3] percpu: Export per_cpu_sum()
Date: Wed, 17 Mar 2021 15:54:51 +0800	[thread overview]
Message-ID: <1615967692-80524-3-git-send-email-xlpang@linux.alibaba.com> (raw)
In-Reply-To: <1615967692-80524-1-git-send-email-xlpang@linux.alibaba.com>

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

Tested-by: James Wang <jnwang@linux.alibaba.com>
Signed-off-by: Xunlei Pang <xlpang@linux.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



  parent reply	other threads:[~2021-03-17  7:55 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-17  7:54 [PATCH v4 0/3] mm/slub: Fix count_partial() problem Xunlei Pang
2021-03-17  7:54 ` [PATCH v4 1/3] mm/slub: Introduce two counters for partial objects Xunlei Pang
2021-03-17 18:45   ` Vlastimil Babka
2021-03-18  4:52     ` Xunlei Pang
2021-03-18 12:18   ` Vlastimil Babka
2021-03-18 12:56     ` Xunlei Pang
2021-03-22  1:46       ` Shu Ming
2021-03-22 10:22         ` Vlastimil Babka
2021-03-29  1:58           ` Shu Ming
2021-03-17  7:54 ` Xunlei Pang [this message]
2021-03-17  7:54 ` [PATCH v4 3/3] mm/slub: Get rid of count_partial() Xunlei Pang

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