linux-kernel - Re: [PATCH 1/5] coresight: Include required headers in C files

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Date:   Mon, 27 Apr 2020 10:34:46 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Douglas Anderson <dianders@...omium.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>
Subject: Re: [PATCH 1/5] coresight: Include required headers in C files

On Sun, Apr 26, 2020 at 11:58:01AM -0700, Stephen Boyd wrote:
> We should include headers that C files use in the C files that use them
> and avoid relying on implicit includes as much as possible. This helps
> avoid compiler errors in the future about missing declarations when
> header files change includes in the future.
> 
> Cc: Douglas Anderson <dianders@...omium.org>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Mike Leach <mike.leach@...aro.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  drivers/hwtracing/coresight/coresight-cti-platform.c |  8 +++++++-
>  drivers/hwtracing/coresight/coresight-cti-sysfs.c    |  7 +++++++
>  drivers/hwtracing/coresight/coresight-cti.h          | 10 +++++++++-
>  3 files changed, 23 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-cti-platform.c b/drivers/hwtracing/coresight/coresight-cti-platform.c
> index b44d83142b62..245f16c61af8 100644
> --- a/drivers/hwtracing/coresight/coresight-cti-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-cti-platform.c
> @@ -2,11 +2,17 @@
>  /*
>   * Copyright (c) 2019, The Linaro Limited. All rights reserved.
>   */
> +#include <linux/coresight.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/of.h>
> +#include <linux/property.h>
> +#include <linux/slab.h>
>  
>  #include <dt-bindings/arm/coresight-cti-dt.h>
> -#include <linux/of.h>
>  
>  #include "coresight-cti.h"
> +#include "coresight-priv.h"
>  
>  /* Number of CTI signals in the v8 architecturally defined connection */
>  #define NR_V8PE_IN_SIGS		2
> diff --git a/drivers/hwtracing/coresight/coresight-cti-sysfs.c b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> index 1f8fb7c15e80..bed460541f15 100644
> --- a/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> @@ -4,7 +4,14 @@
>   * Author: Mike Leach <mike.leach@...aro.org>
>   */
>  
> +#include <linux/atomic.h>
>  #include <linux/coresight.h>
> +#include <linux/device.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/sysfs.h>
>  
>  #include "coresight-cti.h"
>  
> diff --git a/drivers/hwtracing/coresight/coresight-cti.h b/drivers/hwtracing/coresight/coresight-cti.h
> index 004df3ab9dd0..d80123b905a8 100644
> --- a/drivers/hwtracing/coresight/coresight-cti.h
> +++ b/drivers/hwtracing/coresight/coresight-cti.h
> @@ -7,8 +7,10 @@
>  #ifndef _CORESIGHT_CORESIGHT_CTI_H
>  #define _CORESIGHT_CORESIGHT_CTI_H
>  
> -#include <asm/local.h>
> +#include <linux/list.h>
>  #include <linux/spinlock.h>
> +#include <linux/types.h>
> +
>  #include "coresight-priv.h"
>  
>  /*
> @@ -52,6 +54,12 @@
>   */
>  #define CTIINOUTEN_MAX		32
>  
> +struct attribute;
> +struct attribute_group;
> +struct coresight_device;
> +struct device;
> +struct fwnode_handle;
> +

I would prefer adding the headers rather than forward declarations, it scales
better.

Thanks,
Mathieu

>  /**
>   * Group of related trigger signals
>   *
> -- 
> Sent by a computer, using git, on the internet
>