linux-kernel - Re: [PATCH] soc: qcom: llcc: Name regmaps to avoid collisions

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Date:   Mon, 7 Oct 2019 14:20:47 -0700
From:   Evan Green <evgreen@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Venkata Narendra Kumar Gutta <vnkgutta@...eaurora.org>
Subject: Re: [PATCH] soc: qcom: llcc: Name regmaps to avoid collisions

On Fri, Oct 4, 2019 at 4:31 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> We'll end up with debugfs collisions if we don't give names to the
> regmaps created inside this driver. Copy the template config over into
> this function and give the regmap the same name as the resource name.
>
> Fixes: 7f9c136216c7 ("soc: qcom: Add broadcast base for Last Level Cache Controller (LLCC)")
> Cc: Venkata Narendra Kumar Gutta <vnkgutta@...eaurora.org>
> Cc: Evan Green <evgreen@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  drivers/soc/qcom/llcc-slice.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/soc/qcom/llcc-slice.c b/drivers/soc/qcom/llcc-slice.c
> index 9090ea12eaf3..aa342938c403 100644
> --- a/drivers/soc/qcom/llcc-slice.c
> +++ b/drivers/soc/qcom/llcc-slice.c
> @@ -48,13 +48,6 @@
>
>  static struct llcc_drv_data *drv_data = (void *) -EPROBE_DEFER;
>
> -static const struct regmap_config llcc_regmap_config = {
> -       .reg_bits = 32,
> -       .reg_stride = 4,
> -       .val_bits = 32,
> -       .fast_io = true,
> -};
> -
>  /**
>   * llcc_slice_getd - get llcc slice descriptor
>   * @uid: usecase_id for the client
> @@ -314,6 +307,12 @@ static struct regmap *qcom_llcc_init_mmio(struct platform_device *pdev,
>  {
>         struct resource *res;
>         void __iomem *base;
> +       static struct regmap_config llcc_regmap_config = {
> +               .reg_bits = 32,
> +               .reg_stride = 4,
> +               .val_bits = 32,
> +               .fast_io = true,
> +       };

Why did you move this to be a static local? I think it works, but it
makes it look like this is a local variable that's possibly used out
of scope. Maybe leave it as a global?