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* [PATCH v2] clk: tegra: bpmp: remove kcalloc
@ 2026-10-01  5:47 Rosen Penev
  2026-10-02 15:46 ` Brian Masney
  0 siblings, 1 reply; 2+ messages in thread
From: Rosen Penev @ 2026-10-01  5:47 UTC (permalink / raw)
  To: linux-clk
  Cc: Prashant Gaikwad, Stephen Boyd, Brian Masney, Jerome Brunet,
	Thierry Reding, Jonathan Hunter, Kees Cook, Gustavo A. R. Silva,
	open list:TEGRA ARCHITECTURE SUPPORT, open list,
	open list:KERNEL HARDENING (not covered by other
	areas):Keyword:b__counted_by(_le|_be|_ptr)?b

Use a flexible array member to avoid allocating separately.

Use __counted_by for extra runtime analysis.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 v2: fix subject
 drivers/clk/tegra/clk-bpmp.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/clk/tegra/clk-bpmp.c b/drivers/clk/tegra/clk-bpmp.c
index 067a8555c4e7..15b976162b59 100644
--- a/drivers/clk/tegra/clk-bpmp.c
+++ b/drivers/clk/tegra/clk-bpmp.c
@@ -32,7 +32,7 @@ struct tegra_bpmp_clk {
 	unsigned int id;
 
 	unsigned int num_parents;
-	unsigned int *parents;
+	unsigned int parents[] __counted_by(num_parents);
 };
 
 static inline struct tegra_bpmp_clk *to_tegra_bpmp_clk(struct clk_hw *hw)
@@ -518,20 +518,14 @@ tegra_bpmp_clk_register(struct tegra_bpmp *bpmp,
 	unsigned int i;
 	int err;
 
-	clk = devm_kzalloc(bpmp->dev, sizeof(*clk), GFP_KERNEL);
+	clk = devm_kzalloc(bpmp->dev, struct_size(clk, parents, info->num_parents), GFP_KERNEL);
 	if (!clk)
 		return ERR_PTR(-ENOMEM);
 
+	clk->num_parents = info->num_parents;
 	clk->id = info->id;
 	clk->bpmp = bpmp;
 
-	clk->parents = devm_kcalloc(bpmp->dev, info->num_parents,
-				    sizeof(*clk->parents), GFP_KERNEL);
-	if (!clk->parents)
-		return ERR_PTR(-ENOMEM);
-
-	clk->num_parents = info->num_parents;
-
 	/* hardware clock initialization */
 	memset(&init, 0, sizeof(init));
 	init.name = info->name;
-- 
2.55.0


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2026-10-01  5:47 [PATCH v2] clk: tegra: bpmp: remove kcalloc Rosen Penev
2026-10-02 15:46 ` Brian Masney

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