linux-kernel - Re: [PATCH v2 2/6] staging: video: rockchip: add v4l2 decoder

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Date:   Thu, 07 Mar 2019 18:33:37 -0800
From:   Joe Perches <joe@...ches.com>
To:     Randy Li <randy.li@...k-chips.com>, linux-media@...r.kernel.org
Cc:     Randy Li <ayaka@...lik.info>, hverkuil@...all.nl,
        maxime.ripard@...tlin.com, joro@...tes.org,
        linux-kernel@...r.kernel.org, jernej.skrabec@...il.com,
        nicolas@...fresne.ca, paul.kocialkowski@...tlin.com,
        linux-rockchip@...ts.infradead.org, thomas.petazzoni@...tlin.com,
        mchehab@...nel.org, ezequiel@...labora.com,
        linux-arm-kernel@...ts.infradead.org, posciak@...omium.org,
        groeck@...omium.org
Subject: Re: [PATCH v2 2/6] staging: video: rockchip: add v4l2 decoder

On Thu, 2019-03-07 at 18:03 +0800, Randy Li wrote:
> It is based on the vendor driver sent to mail list before.

trivial notes:

> diff --git a/drivers/staging/rockchip-mpp/mpp_debug.h b/drivers/staging/rockchip-mpp/mpp_debug.h
[]
> +#define mpp_debug_func(type, fmt, args...)			\
> +	do {							\
> +		if (unlikely(debug & type)) {			\
> +			pr_info("%s:%d: " fmt,			\
> +				 __func__, __LINE__, ##args);	\
> +		}						\
> +	} while (0)
> +#define mpp_debug(type, fmt, args...)				\
> +	do {							\
> +		if (unlikely(debug & type)) {			\
> +			pr_info(fmt, ##args);			\
> +		}						\
> +	} while (0)
> +

It's generally better to emit debug messages at KERN_DEBUG

> +#define mpp_debug_enter()					\
> +	do {							\
> +		if (unlikely(debug & DEBUG_FUNCTION)) {		\
> +			pr_info("%s:%d: enter\n",		\
> +				 __func__, __LINE__);		\
> +		}						\
> +	} while (0)
> +
> +#define mpp_debug_leave()					\
> +	do {							\
> +		if (unlikely(debug & DEBUG_FUNCTION)) {		\
> +			pr_info("%s:%d: leave\n",		\
> +				 __func__, __LINE__);		\
> +		}						\
> +	} while (0)

I suggest removal of these macros and uses.

There's not much value in enter/leave markings as
the generic ftrace facility does this already.

> +
> +#define mpp_err(fmt, args...)					\
> +		pr_err("%s:%d: " fmt, __func__, __LINE__, ##args)

__func__, __LINE__ markings generally have little value.