We cannot assign any value to an array type variable. So, hw_data->hws = kcalloc(hw_data->num, sizeof(struct clk_hw *), GFP_KERNEL);
fails with "invalid use of flexible array member" error. There are two ways to fix this issue. [1] Make it a double-pointer struct clk_hw_onecell_data { size_t num; struct clk_hw **hws; }; This works as struct clk_onecell_data does. [2] Make it a zero-sized array struct clk_hw_onecell_data { size_t num; struct clk_hw *hws[0]; }; This allows one-shot memory allocation like this: hw_data = kmalloc(sizeof(*hw_data) + clk_num * sizeof(struct clk_hw *), GFP_KERNEL); This commit adopts [2] because it looks like Stephen's intention (he moved hws[] to the bottom of struct clk_hw_onecell_data). Fixes: 0861e5b8cf80 ("clk: Add clk_hw OF clk providers") Signed-off-by: Masahiro Yamada <yamada.masah...@socionext.com> --- include/linux/clk-provider.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index fd2ccd5..1850e25 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -769,7 +769,7 @@ struct clk_onecell_data { struct clk_hw_onecell_data { size_t num; - struct clk_hw *hws[]; + struct clk_hw *hws[0]; }; extern struct of_device_id __clk_of_table; -- 1.9.1