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@xxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxx
Signed-off-by: Xunlei Pang <xlpang@xxxxxxxxxxxxxxxxx>
Tested-by: James Wang <jnwang@xxxxxxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Shu Ming <sming56@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Wen Yang <wenyang@xxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxxxxxxxxx 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
