linux-kernel - [PATCH] KVM: Move binary stats helpers to header to effectively export them

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Date:   Wed, 11 Aug 2021 09:53:46 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jing Zhang <jingzhangos@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH] KVM: Move binary stats helpers to header to effectively
 export them

Move kvm_stats_linear_hist_update() and kvm_stats_log_hist_update() to
kvm_host.h as static inline helpers to resolve a linker error on PPC,
which references the latter from module code.  This also fixes a goof
where the functions are tagged as "inline", despite being externs and
thus not inline-friendy.

  ERROR: modpost: ".kvm_stats_log_hist_update" [arch/powerpc/kvm/kvm-hv.ko] undefined!

Fixes: c8ba95948182 ("KVM: stats: Support linear and logarithmic histogram statistics")
Cc: Jing Zhang <jingzhangos@...gle.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 include/linux/kvm_host.h | 38 +++++++++++++++++++++++++++++++++++---
 virt/kvm/binary_stats.c  | 34 ----------------------------------
 2 files changed, 35 insertions(+), 37 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index d447b21cdd73..e4d712e9f760 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1467,9 +1467,41 @@ ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
 		       const struct _kvm_stats_desc *desc,
 		       void *stats, size_t size_stats,
 		       char __user *user_buffer, size_t size, loff_t *offset);
-inline void kvm_stats_linear_hist_update(u64 *data, size_t size,
-				  u64 value, size_t bucket_size);
-inline void kvm_stats_log_hist_update(u64 *data, size_t size, u64 value);
+
+/**
+ * kvm_stats_linear_hist_update() - Update bucket value for linear histogram
+ * statistics data.
+ *
+ * @data: start address of the stats data
+ * @size: the number of bucket of the stats data
+ * @value: the new value used to update the linear histogram's bucket
+ * @bucket_size: the size (width) of a bucket
+ */
+static inline void kvm_stats_linear_hist_update(u64 *data, size_t size,
+						u64 value, size_t bucket_size)
+{
+	size_t index = div64_u64(value, bucket_size);
+
+	index = min(index, size - 1);
+	++data[index];
+}
+
+/**
+ * kvm_stats_log_hist_update() - Update bucket value for logarithmic histogram
+ * statistics data.
+ *
+ * @data: start address of the stats data
+ * @size: the number of bucket of the stats data
+ * @value: the new value used to update the logarithmic histogram's bucket
+ */
+static inline void kvm_stats_log_hist_update(u64 *data, size_t size, u64 value)
+{
+	size_t index = fls64(value);
+
+	index = min(index, size - 1);
+	++data[index];
+}
+
 #define KVM_STATS_LINEAR_HIST_UPDATE(array, value, bsize)		       \
 	kvm_stats_linear_hist_update(array, ARRAY_SIZE(array), value, bsize)
 #define KVM_STATS_LOG_HIST_UPDATE(array, value)				       \
diff --git a/virt/kvm/binary_stats.c b/virt/kvm/binary_stats.c
index 9bd595c92d3a..eefca6c69f51 100644
--- a/virt/kvm/binary_stats.c
+++ b/virt/kvm/binary_stats.c
@@ -142,37 +142,3 @@ ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
 	*offset = pos;
 	return len;
 }
-
-/**
- * kvm_stats_linear_hist_update() - Update bucket value for linear histogram
- * statistics data.
- *
- * @data: start address of the stats data
- * @size: the number of bucket of the stats data
- * @value: the new value used to update the linear histogram's bucket
- * @bucket_size: the size (width) of a bucket
- */
-inline void kvm_stats_linear_hist_update(u64 *data, size_t size,
-				  u64 value, size_t bucket_size)
-{
-	size_t index = div64_u64(value, bucket_size);
-
-	index = min(index, size - 1);
-	++data[index];
-}
-
-/**
- * kvm_stats_log_hist_update() - Update bucket value for logarithmic histogram
- * statistics data.
- *
- * @data: start address of the stats data
- * @size: the number of bucket of the stats data
- * @value: the new value used to update the logarithmic histogram's bucket
- */
-inline void kvm_stats_log_hist_update(u64 *data, size_t size, u64 value)
-{
-	size_t index = fls64(value);
-
-	index = min(index, size - 1);
-	++data[index];
-}
-- 
2.32.0.605.g8dce9f2422-goog