Re: [PATCH v3 1/3] clk: at91: optimize pmc data allocation

From: Alexandre Belloni
Date: Wed Mar 25 2020 - 05:37:09 EST

Hi,

On 21/03/2020 22:18:03+0100, MichaÅ MirosÅaw wrote:
> Alloc whole data structure in one block. This makes the code shorter,
> more efficient and easier to extend in following patch.
>
> Signed-off-by: MichaÅ MirosÅaw <mirq-linux@xxxxxxxxxxxx

You are missing a '>'

Acked-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>

> ---
> v2: rebase and update to clk/clk-at91 branch
> v3: use struct_size() and C99 trailing array
> as suggested by Stephen Boyd
> ---
> drivers/clk/at91/at91rm9200.c | 2 +-
> drivers/clk/at91/at91sam9260.c | 2 +-
> drivers/clk/at91/at91sam9g45.c | 2 +-
> drivers/clk/at91/at91sam9n12.c | 2 +-
> drivers/clk/at91/at91sam9rl.c | 2 +-
> drivers/clk/at91/at91sam9x5.c | 2 +-
> drivers/clk/at91/pmc.c | 34 ++++++++--------------------------
> drivers/clk/at91/pmc.h | 3 ++-
> drivers/clk/at91/sam9x60.c | 2 +-
> drivers/clk/at91/sama5d2.c | 2 +-
> drivers/clk/at91/sama5d3.c | 2 +-
> drivers/clk/at91/sama5d4.c | 2 +-
> 12 files changed, 20 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/clk/at91/at91rm9200.c b/drivers/clk/at91/at91rm9200.c
> index c44a431b6c97..6f4e1151553d 100644
> --- a/drivers/clk/at91/at91rm9200.c
> +++ b/drivers/clk/at91/at91rm9200.c
> @@ -187,7 +187,7 @@ static void __init at91rm9200_pmc_setup(struct device_node *np)
> return;
>
> err_free:
> - pmc_data_free(at91rm9200_pmc);
> + kfree(at91rm9200_pmc);
> }
> /*
> * While the TCB can be used as the clocksource, the system timer is most likely
> diff --git a/drivers/clk/at91/at91sam9260.c b/drivers/clk/at91/at91sam9260.c
> index a9d4234758d7..946f03a09858 100644
> --- a/drivers/clk/at91/at91sam9260.c
> +++ b/drivers/clk/at91/at91sam9260.c
> @@ -462,7 +462,7 @@ static void __init at91sam926x_pmc_setup(struct device_node *np,
> return;
>
> err_free:
> - pmc_data_free(at91sam9260_pmc);
> + kfree(at91sam9260_pmc);
> }
>
> static void __init at91sam9260_pmc_setup(struct device_node *np)
> diff --git a/drivers/clk/at91/at91sam9g45.c b/drivers/clk/at91/at91sam9g45.c
> index 38a7d2d2df0c..53e8252b8a63 100644
> --- a/drivers/clk/at91/at91sam9g45.c
> +++ b/drivers/clk/at91/at91sam9g45.c
> @@ -210,7 +210,7 @@ static void __init at91sam9g45_pmc_setup(struct device_node *np)
> return;
>
> err_free:
> - pmc_data_free(at91sam9g45_pmc);
> + kfree(at91sam9g45_pmc);
> }
> /*
> * The TCB is used as the clocksource so its clock is needed early. This means
> diff --git a/drivers/clk/at91/at91sam9n12.c b/drivers/clk/at91/at91sam9n12.c
> index 8bb39d2ba84b..f3ae1cd3cb8d 100644
> --- a/drivers/clk/at91/at91sam9n12.c
> +++ b/drivers/clk/at91/at91sam9n12.c
> @@ -228,7 +228,7 @@ static void __init at91sam9n12_pmc_setup(struct device_node *np)
> return;
>
> err_free:
> - pmc_data_free(at91sam9n12_pmc);
> + kfree(at91sam9n12_pmc);
> }
> /*
> * The TCB is used as the clocksource so its clock is needed early. This means
> diff --git a/drivers/clk/at91/at91sam9rl.c b/drivers/clk/at91/at91sam9rl.c
> index 77fe83a73bf4..cc739d214ae3 100644
> --- a/drivers/clk/at91/at91sam9rl.c
> +++ b/drivers/clk/at91/at91sam9rl.c
> @@ -166,6 +166,6 @@ static void __init at91sam9rl_pmc_setup(struct device_node *np)
> return;
>
> err_free:
> - pmc_data_free(at91sam9rl_pmc);
> + kfree(at91sam9rl_pmc);
> }
> CLK_OF_DECLARE_DRIVER(at91sam9rl_pmc, "atmel,at91sam9rl-pmc", at91sam9rl_pmc_setup);
> diff --git a/drivers/clk/at91/at91sam9x5.c b/drivers/clk/at91/at91sam9x5.c
> index 086cf0b4955c..aac99d699568 100644
> --- a/drivers/clk/at91/at91sam9x5.c
> +++ b/drivers/clk/at91/at91sam9x5.c
> @@ -278,7 +278,7 @@ static void __init at91sam9x5_pmc_setup(struct device_node *np,
> return;
>
> err_free:
> - pmc_data_free(at91sam9x5_pmc);
> + kfree(at91sam9x5_pmc);
> }
>
> static void __init at91sam9g15_pmc_setup(struct device_node *np)
> diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
> index b71515acdec1..ac46ea1b9fda 100644
> --- a/drivers/clk/at91/pmc.c
> +++ b/drivers/clk/at91/pmc.c
> @@ -76,48 +76,30 @@ struct clk_hw *of_clk_hw_pmc_get(struct of_phandle_args *clkspec, void *data)
> return ERR_PTR(-EINVAL);
> }
>
> -void pmc_data_free(struct pmc_data *pmc_data)
> -{
> - kfree(pmc_data->chws);
> - kfree(pmc_data->shws);
> - kfree(pmc_data->phws);
> - kfree(pmc_data->ghws);
> -}
> -
> struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
> unsigned int nperiph, unsigned int ngck)
> {
> - struct pmc_data *pmc_data = kzalloc(sizeof(*pmc_data), GFP_KERNEL);
> + unsigned int num_clks = ncore + nsystem + nperiph + ngck;
> + struct pmc_data *pmc_data;
>
> + pmc_data = kzalloc(struct_size(pmc_data, hwtable, num_clks),
> + GFP_KERNEL);
> if (!pmc_data)
> return NULL;
>
> pmc_data->ncore = ncore;
> - pmc_data->chws = kcalloc(ncore, sizeof(struct clk_hw *), GFP_KERNEL);
> - if (!pmc_data->chws)
> - goto err;
> + pmc_data->chws = pmc_data->hwtable;
>
> pmc_data->nsystem = nsystem;
> - pmc_data->shws = kcalloc(nsystem, sizeof(struct clk_hw *), GFP_KERNEL);
> - if (!pmc_data->shws)
> - goto err;
> + pmc_data->shws = pmc_data->chws + ncore;
>
> pmc_data->nperiph = nperiph;
> - pmc_data->phws = kcalloc(nperiph, sizeof(struct clk_hw *), GFP_KERNEL);
> - if (!pmc_data->phws)
> - goto err;
> + pmc_data->phws = pmc_data->shws + nsystem;
>
> pmc_data->ngck = ngck;
> - pmc_data->ghws = kcalloc(ngck, sizeof(struct clk_hw *), GFP_KERNEL);
> - if (!pmc_data->ghws)
> - goto err;
> + pmc_data->ghws = pmc_data->phws + nperiph;
>
> return pmc_data;
> -
> -err:
> - pmc_data_free(pmc_data);
> -
> - return NULL;
> }
>
> #ifdef CONFIG_PM
> diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
> index 9b8db9cdcda5..fc3ef772b9d9 100644
> --- a/drivers/clk/at91/pmc.h
> +++ b/drivers/clk/at91/pmc.h
> @@ -24,6 +24,8 @@ struct pmc_data {
> struct clk_hw **phws;
> unsigned int ngck;
> struct clk_hw **ghws;
> +
> + struct clk_hw *hwtable[];
> };
>
> struct clk_range {
> @@ -95,7 +97,6 @@ struct clk_pcr_layout {
> #define nck(a) (a[ARRAY_SIZE(a) - 1].id + 1)
> struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
> unsigned int nperiph, unsigned int ngck);
> -void pmc_data_free(struct pmc_data *pmc_data);
>
> int of_at91_get_clk_range(struct device_node *np, const char *propname,
> struct clk_range *range);
> diff --git a/drivers/clk/at91/sam9x60.c b/drivers/clk/at91/sam9x60.c
> index cc19e8fb83be..a7d4f648db26 100644
> --- a/drivers/clk/at91/sam9x60.c
> +++ b/drivers/clk/at91/sam9x60.c
> @@ -299,7 +299,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
> return;
>
> err_free:
> - pmc_data_free(sam9x60_pmc);
> + kfree(sam9x60_pmc);
> }
> /* Some clks are used for a clocksource */
> CLK_OF_DECLARE(sam9x60_pmc, "microchip,sam9x60-pmc", sam9x60_pmc_setup);
> diff --git a/drivers/clk/at91/sama5d2.c b/drivers/clk/at91/sama5d2.c
> index ff7e3f727082..b2560670e5af 100644
> --- a/drivers/clk/at91/sama5d2.c
> +++ b/drivers/clk/at91/sama5d2.c
> @@ -350,6 +350,6 @@ static void __init sama5d2_pmc_setup(struct device_node *np)
> return;
>
> err_free:
> - pmc_data_free(sama5d2_pmc);
> + kfree(sama5d2_pmc);
> }
> CLK_OF_DECLARE_DRIVER(sama5d2_pmc, "atmel,sama5d2-pmc", sama5d2_pmc_setup);
> diff --git a/drivers/clk/at91/sama5d3.c b/drivers/clk/at91/sama5d3.c
> index 88506f909c08..914e6f225510 100644
> --- a/drivers/clk/at91/sama5d3.c
> +++ b/drivers/clk/at91/sama5d3.c
> @@ -231,7 +231,7 @@ static void __init sama5d3_pmc_setup(struct device_node *np)
> return;
>
> err_free:
> - pmc_data_free(sama5d3_pmc);
> + kfree(sama5d3_pmc);
> }
> /*
> * The TCB is used as the clocksource so its clock is needed early. This means
> diff --git a/drivers/clk/at91/sama5d4.c b/drivers/clk/at91/sama5d4.c
> index a6dee4a3b6e4..4ca9a4619500 100644
> --- a/drivers/clk/at91/sama5d4.c
> +++ b/drivers/clk/at91/sama5d4.c
> @@ -267,6 +267,6 @@ static void __init sama5d4_pmc_setup(struct device_node *np)
> return;
>
> err_free:
> - pmc_data_free(sama5d4_pmc);
> + kfree(sama5d4_pmc);
> }
> CLK_OF_DECLARE_DRIVER(sama5d4_pmc, "atmel,sama5d4-pmc", sama5d4_pmc_setup);
> --
> 2.20.1
>

--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com