+ percpu-export-per_cpu_sum.patch added to -mm tree

+ percpu-export-per_cpu_sum.patch added to -mm tree

[akpm]

The patch titled
     Subject: percpu: export per_cpu_sum()
has been added to the -mm tree.  Its filename is
     percpu-export-per_cpu_sum.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/percpu-export-per_cpu_sum.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/percpu-export-per_cpu_sum.patch

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------------------------------------------------------
From: Xunlei Pang <xlpang@linux.alibaba.com>
Subject: percpu: export per_cpu_sum()

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

Link: https://lkml.kernel.org/r/1615303512-35058-4-git-send-email-xlpang@linux.alibaba.com
Signed-off-by: Xunlei Pang <xlpang@linux.alibaba.com>
Tested-by: James Wang <jnwang@linux.alibaba.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Shu Ming <sming56@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wen Yang <wenyang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/percpu-defs.h   |   10 ++++++++++
 kernel/locking/percpu-rwsem.c |   10 ----------
 2 files changed, 10 insertions(+), 10 deletions(-)

--- a/include/linux/percpu-defs.h~percpu-export-per_cpu_sum
+++ a/include/linux/percpu-defs.h
@@ -220,6 +220,16 @@ do {									\
 	(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
 
 /*
--- a/kernel/locking/percpu-rwsem.c~percpu-export-per_cpu_sum
+++ a/kernel/locking/percpu-rwsem.c
@@ -178,16 +178,6 @@ bool __percpu_down_read(struct percpu_rw
 }
 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
_

Patches currently in -mm which might be from xlpang@linux.alibaba.com are

mm-slub-introduce-two-counters-for-partial-objects.patch
mm-slub-get-rid-of-count_partial.patch
percpu-export-per_cpu_sum.patch
mm-slub-use-percpu-partial-free-counter.patch