[PATCH 07/10] percpu: per_cpu_sum()

[Kent Overstreet <kent.overstreet@xxxxxxxxx>]

Add a little helper to replace open coded versions.

Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
---
 fs/bcachefs/util.h     | 10 ----------
 fs/dcache.c            | 16 +++-------------
 include/linux/percpu.h | 10 ++++++++++
 3 files changed, 13 insertions(+), 23 deletions(-)

diff --git a/fs/bcachefs/util.h b/fs/bcachefs/util.h
index fb02c1c36004..e90c2f546007 100644
--- a/fs/bcachefs/util.h
+++ b/fs/bcachefs/util.h
@@ -584,16 +584,6 @@ do {									\
 	}								\
 } while (0)
 
-#define per_cpu_sum(_p)							\
-({									\
-	typeof(*_p) _ret = 0;						\
-									\
-	int cpu;							\
-	for_each_possible_cpu(cpu)					\
-		_ret += *per_cpu_ptr(_p, cpu);				\
-	_ret;								\
-})
-
 static inline u64 percpu_u64_get(u64 __percpu *src)
 {
 	return per_cpu_sum(src);
diff --git a/fs/dcache.c b/fs/dcache.c
index 3d8daaecb6d1..64108cbd52f6 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -151,29 +151,19 @@ static struct dentry_stat_t dentry_stat = {
  */
 static long get_nr_dentry(void)
 {
-	int i;
-	long sum = 0;
-	for_each_possible_cpu(i)
-		sum += per_cpu(nr_dentry, i);
+	long sum = per_cpu_sum(&nr_dentry);
 	return sum < 0 ? 0 : sum;
 }
 
 static long get_nr_dentry_unused(void)
 {
-	int i;
-	long sum = 0;
-	for_each_possible_cpu(i)
-		sum += per_cpu(nr_dentry_unused, i);
+	long sum = per_cpu_sum(&nr_dentry_unused);
 	return sum < 0 ? 0 : sum;
 }
 
 static long get_nr_dentry_negative(void)
 {
-	int i;
-	long sum = 0;
-
-	for_each_possible_cpu(i)
-		sum += per_cpu(nr_dentry_negative, i);
+	long sum = per_cpu_sum(&nr_dentry_negative);
 	return sum < 0 ? 0 : sum;
 }
 
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 4b2047b78b67..0df28ff54f66 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -162,4 +162,14 @@ extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
 
 extern unsigned long pcpu_nr_pages(void);
 
+#define per_cpu_sum(_p)							\
+({									\
+	typeof(*(_p)) sum = 0;						\
+	int cpu;							\
+									\
+	for_each_possible_cpu(cpu)					\
+		sum += *per_cpu_ptr(_p, cpu);				\
+	sum;								\
+})
+
 #endif /* __LINUX_PERCPU_H */
-- 
2.45.2