[PATCH] clk: kirkwood: use kzalloc_flex

[Rosen Penev]

Simplify allocation by using a flexible array member and kzalloc_flex to
combine allocations.

Add __counted_by for extra runtime analysis. Move counting variable
assignment to right after allocation as required by __counted_by.

Signed-off-by: Rosen Penev <rosenp at gmail.com>
---
 drivers/clk/mvebu/kirkwood.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/clk/mvebu/kirkwood.c b/drivers/clk/mvebu/kirkwood.c
index ed061d82fb65..fc2972538008 100644
--- a/drivers/clk/mvebu/kirkwood.c
+++ b/drivers/clk/mvebu/kirkwood.c
@@ -253,8 +253,8 @@ struct clk_muxing_soc_desc {
 
 struct clk_muxing_ctrl {
 	spinlock_t *lock;
-	struct clk **muxes;
 	int num_muxes;
+	struct clk *muxes[] __counted_by(num_muxes);
 };
 
 static const char *powersave_parents[] = {
@@ -297,21 +297,18 @@ static void __init kirkwood_clk_muxing_setup(struct device_node *np,
 	if (WARN_ON(!base))
 		return;
 
-	ctrl = kzalloc_obj(*ctrl);
-	if (WARN_ON(!ctrl))
-		goto ctrl_out;
-
-	/* lock must already be initialized */
-	ctrl->lock = &ctrl_gating_lock;
-
 	/* Count, allocate, and register clock muxes */
 	for (n = 0; desc[n].name;)
 		n++;
 
+	ctrl = kzalloc_flex(*ctrl, muxes, n);
+	if (WARN_ON(!ctrl))
+		goto ctrl_out;
+
 	ctrl->num_muxes = n;
-	ctrl->muxes = kzalloc_objs(struct clk *, ctrl->num_muxes);
-	if (WARN_ON(!ctrl->muxes))
-		goto muxes_out;
+
+	/* lock must already be initialized */
+	ctrl->lock = &ctrl_gating_lock;
 
 	for (n = 0; n < ctrl->num_muxes; n++) {
 		ctrl->muxes[n] = clk_register_mux(NULL, desc[n].name,
-- 
2.53.0