linux-kernel - Re: [PATCH v2] intel_th: msu: Fix unused variable warning on arm64 platform

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Date:   Mon, 10 Jun 2019 16:07:01 +0800
From:   Zhangshaokun <zhangshaokun@...ilicon.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2] intel_th: msu: Fix unused variable warning on arm64
 platform

Hi Alexander,

A gentle ping.

On 2019/5/20 19:32, Shaokun Zhang wrote:
> drivers/hwtracing/intel_th/msu.c: In function ‘msc_buffer_win_alloc’:
> drivers/hwtracing/intel_th/msu.c:783:21: warning: unused variable ‘i’ [-Wunused-variable]
>   int ret = -ENOMEM, i;
>                      ^
> drivers/hwtracing/intel_th/msu.c: In function ‘msc_buffer_win_free’:
> drivers/hwtracing/intel_th/msu.c:863:6: warning: unused variable ‘i’ [-Wunused-variable]
>   int i;
>       ^
> Fix this compiler warning on arm64 platform.
> 
> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Suggested-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Signed-off-by: Shaokun Zhang <zhangshaokun@...ilicon.com>
> ---
>  drivers/hwtracing/intel_th/msu.c | 40 +++++++++++++++++++++++++++-------------
>  1 file changed, 27 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c
> index 81bb54fa3ce8..49e64ca760e6 100644
> --- a/drivers/hwtracing/intel_th/msu.c
> +++ b/drivers/hwtracing/intel_th/msu.c
> @@ -767,6 +767,30 @@ static int __msc_buffer_win_alloc(struct msc_window *win,
>  	return -ENOMEM;
>  }
>  
> +#ifdef CONFIG_X86
> +static void msc_buffer_set_uc(struct msc_window *win, unsigned int nr_blocks)
> +{
> +	int i;
> +
> +	for (i = 0; i < nr_blocks; i++)
> +		/* Set the page as uncached */
> +		set_memory_uc((unsigned long)msc_win_block(win, i), 1);
> +}
> +
> +static void msc_buffer_set_wb(struct msc_window *win)
> +{
> +	int i;
> +
> +	for (i = 0; i < win->nr_blocks; i++)
> +		/* Reset the page to write-back */
> +		set_memory_wb((unsigned long)msc_win_block(win, i), 1);
> +}
> +#else /* !X86 */
> +static inline void msc_buffer_set_uc(struct msc_window *win,
> +				     unsigned int nr_blocks) {}
> +static inline void msc_buffer_set_wb(struct msc_window *win) {}
> +#endif /* CONFIG_X86 */
> +
>  /**
>   * msc_buffer_win_alloc() - alloc a window for a multiblock mode
>   * @msc:	MSC device
> @@ -780,7 +804,7 @@ static int __msc_buffer_win_alloc(struct msc_window *win,
>  static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks)
>  {
>  	struct msc_window *win;
> -	int ret = -ENOMEM, i;
> +	int ret = -ENOMEM;
>  
>  	if (!nr_blocks)
>  		return 0;
> @@ -811,11 +835,7 @@ static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks)
>  	if (ret < 0)
>  		goto err_nomem;
>  
> -#ifdef CONFIG_X86
> -	for (i = 0; i < ret; i++)
> -		/* Set the page as uncached */
> -		set_memory_uc((unsigned long)msc_win_block(win, i), 1);
> -#endif
> +	msc_buffer_set_uc(win, ret);
>  
>  	win->nr_blocks = ret;
>  
> @@ -860,8 +880,6 @@ static void __msc_buffer_win_free(struct msc *msc, struct msc_window *win)
>   */
>  static void msc_buffer_win_free(struct msc *msc, struct msc_window *win)
>  {
> -	int i;
> -
>  	msc->nr_pages -= win->nr_blocks;
>  
>  	list_del(&win->entry);
> @@ -870,11 +888,7 @@ static void msc_buffer_win_free(struct msc *msc, struct msc_window *win)
>  		msc->base_addr = 0;
>  	}
>  
> -#ifdef CONFIG_X86
> -	for (i = 0; i < win->nr_blocks; i++)
> -		/* Reset the page to write-back */
> -		set_memory_wb((unsigned long)msc_win_block(win, i), 1);
> -#endif
> +	msc_buffer_set_wb(win);
>  
>  	__msc_buffer_win_free(msc, win);
>  
>