[PATCH] soc: qcom: smem: Use struct_size()

[Christophe JAILLET]

Use struct_size() instead of hand-writing it, when allocating a structure
with a flex array.

This is less verbose.

Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
It will also be helpful if the __counted_by() annotation is added with a
Coccinelle script such as:
   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?h=devel/counted_by&id=adc5b3cb48a049563dc673f348eab7b6beba8a9b
---
 drivers/soc/qcom/smem.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index b0d59e815c3b..776096b2e965 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -1059,7 +1059,6 @@ static int qcom_smem_probe(struct platform_device *pdev)
 	struct reserved_mem *rmem;
 	struct qcom_smem *smem;
 	unsigned long flags;
-	size_t array_size;
 	int num_regions;
 	int hwlock_id;
 	u32 version;
@@ -1071,8 +1070,8 @@ static int qcom_smem_probe(struct platform_device *pdev)
 	if (of_property_present(pdev->dev.of_node, "qcom,rpm-msg-ram"))
 		num_regions++;
 
-	array_size = num_regions * sizeof(struct smem_region);
-	smem = devm_kzalloc(&pdev->dev, sizeof(*smem) + array_size, GFP_KERNEL);
+	smem = devm_kzalloc(&pdev->dev, struct_size(smem, regions, num_regions),
+			    GFP_KERNEL);
 	if (!smem)
 		return -ENOMEM;
 
-- 
2.34.1