linux-kernel - Re: [PATCH] soc: qcom: geni: Make version macros simpler

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Date:   Fri, 22 Jun 2018 09:54:54 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Gross <andy.gross@...aro.org>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Karthikeyan Ramasubramanian <kramasub@...eaurora.org>,
        Sagar Dharia <sdharia@...eaurora.org>,
        Girish Mahadevan <girishm@...eaurora.org>
Subject: Re: [PATCH] soc: qcom: geni: Make version macros simpler

On Fri 18 May 15:47 PDT 2018, Stephen Boyd wrote:

> This macro doesn't work, because it hides a local variable inside of the
> macro to hold the version and that variable name is called 'ver' and
> 'version' sometimes.
> 
> Let's change this to be more explicit. Introduce three macros for the
> major, minor, and step of the version, and require callers to pass the
> version in to get the part of the version out. This way we don't hide
> local variables inside macros and things are less evil overall.
> 
> Cc: Karthikeyan Ramasubramanian <kramasub@...eaurora.org>
> Cc: Sagar Dharia <sdharia@...eaurora.org>
> Cc: Girish Mahadevan <girishm@...eaurora.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>

I was expecting that someone referenced this macro, but I guess that's
coming?

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  include/linux/qcom-geni-se.h | 13 ++++---------
>  1 file changed, 4 insertions(+), 9 deletions(-)
> 
> diff --git a/include/linux/qcom-geni-se.h b/include/linux/qcom-geni-se.h
> index 5d6144977828..3bcd67fd5548 100644
> --- a/include/linux/qcom-geni-se.h
> +++ b/include/linux/qcom-geni-se.h
> @@ -225,19 +225,14 @@ struct geni_se {
>  #define HW_VER_MINOR_SHFT		16
>  #define HW_VER_STEP_MASK		GENMASK(15, 0)
>  
> +#define GENI_SE_VERSION_MAJOR(ver) ((ver & HW_VER_MAJOR_MASK) >> HW_VER_MAJOR_SHFT)
> +#define GENI_SE_VERSION_MINOR(ver) ((ver & HW_VER_MINOR_MASK) >> HW_VER_MINOR_SHFT)
> +#define GENI_SE_VERSION_STEP(ver) (ver & HW_VER_STEP_MASK)
> +
>  #if IS_ENABLED(CONFIG_QCOM_GENI_SE)
>  
>  u32 geni_se_get_qup_hw_version(struct geni_se *se);
>  
> -#define geni_se_get_wrapper_version(se, major, minor, step) do { \
> -	u32 ver; \
> -\
> -	ver = geni_se_get_qup_hw_version(se); \
> -	major = (ver & HW_VER_MAJOR_MASK) >> HW_VER_MAJOR_SHFT; \
> -	minor = (ver & HW_VER_MINOR_MASK) >> HW_VER_MINOR_SHFT; \
> -	step = version & HW_VER_STEP_MASK; \
> -} while (0)
> -
>  /**
>   * geni_se_read_proto() - Read the protocol configured for a serial engine
>   * @se:		Pointer to the concerned serial engine.
> -- 
> Sent by a computer through tubes
> 
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