[PATCHv3 1/3] clk: samsung: use kzalloc_flex

Simplify allocation by using kzalloc_flex with a flexible array member
to combine allocations. samsung_clk_alloc_reg_dump is no longer needed
for this struct but is needed elsewhere.

Add __counted_by for extra runtime analysis. Move counting variable
assignment after kzalloc_flex which does the same with GCC 15 and above.

Signed-off-by: Rosen Penev <[email protected]>
---
 drivers/clk/samsung/clk.c | 11 ++++++-----
 drivers/clk/samsung/clk.h |  4 ++--
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/clk/samsung/clk.c b/drivers/clk/samsung/clk.c
index 91e5cdbc79d7..2895c77534ae 100644
--- a/drivers/clk/samsung/clk.c
+++ b/drivers/clk/samsung/clk.c
@@ -430,21 +430,22 @@ void samsung_clk_extended_sleep_init(void __iomem *reg_base,
 			unsigned long nr_rsuspend)
 {
 	struct samsung_clock_reg_cache *reg_cache;
+	int i;
 
-	reg_cache = kzalloc_obj(struct samsung_clock_reg_cache);
+	reg_cache = kzalloc_flex(*reg_cache, rdump, nr_rdump);
 	if (!reg_cache)
 		panic("could not allocate register reg_cache.\n");
-	reg_cache->rdump = samsung_clk_alloc_reg_dump(rdump, nr_rdump);
 
-	if (!reg_cache->rdump)
-		panic("could not allocate register dump storage.\n");
+	reg_cache->rd_num = nr_rdump;
+
+	for (i = 0; i < nr_rdump; ++i)
+		reg_cache->rdump[i].offset = rdump[i];
 
 	if (list_empty(&clock_reg_cache_list))
 		register_syscore(&samsung_clk_syscore);
 
 	reg_cache->reg_base = reg_base;
 	reg_cache->sysreg = sysreg;
-	reg_cache->rd_num = nr_rdump;
 	reg_cache->rsuspend = rsuspend;
 	reg_cache->rsuspend_num = nr_rsuspend;
 	list_add_tail(&reg_cache->node, &clock_reg_cache_list);
diff --git a/drivers/clk/samsung/clk.h b/drivers/clk/samsung/clk.h
index b1192ca03db5..be733eba08a2 100644
--- a/drivers/clk/samsung/clk.h
+++ b/drivers/clk/samsung/clk.h
@@ -324,10 +324,10 @@ struct samsung_clock_reg_cache {
 	struct list_head node;
 	void __iomem *reg_base;
 	struct regmap *sysreg;
-	struct samsung_clk_reg_dump *rdump;
-	unsigned int rd_num;
 	const struct samsung_clk_reg_dump *rsuspend;
 	unsigned int rsuspend_num;
+	unsigned int rd_num;
+	struct samsung_clk_reg_dump rdump[] __counted_by(rd_num);
 };
 
 /**
-- 
2.54.0