linux-kernel - Re: [PATCH v2 01/19] perf, tools: Save max_x, max

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Date:   Tue, 22 Aug 2017 10:20:28 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v2 01/19] perf, tools: Save max_x, max_y in xyarray

On Fri, Aug 11, 2017 at 04:26:16PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Save the original array dimensions in xyarrays, so that users can retrieve them
> later. Add some inline functions to access these fields.
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/util/xyarray.c |  2 ++
>  tools/perf/util/xyarray.h | 12 ++++++++++++
>  2 files changed, 14 insertions(+)
> 
> diff --git a/tools/perf/util/xyarray.c b/tools/perf/util/xyarray.c
> index 7251fdbabced..c8f415d9877b 100644
> --- a/tools/perf/util/xyarray.c
> +++ b/tools/perf/util/xyarray.c
> @@ -12,6 +12,8 @@ struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size)
>  		xy->entry_size = entry_size;
>  		xy->row_size   = row_size;
>  		xy->entries    = xlen * ylen;
> +		xy->max_x      = xlen;
> +		xy->max_y      = ylen;
>  	}
>  
>  	return xy;
> diff --git a/tools/perf/util/xyarray.h b/tools/perf/util/xyarray.h
> index 7f30af371b7e..785884158137 100644
> --- a/tools/perf/util/xyarray.h
> +++ b/tools/perf/util/xyarray.h
> @@ -7,6 +7,8 @@ struct xyarray {
>  	size_t row_size;
>  	size_t entry_size;
>  	size_t entries;
> +	size_t max_x;
> +	size_t max_y;
>  	char contents[];
>  };
>  
> @@ -19,4 +21,14 @@ static inline void *xyarray__entry(struct xyarray *xy, int x, int y)
>  	return &xy->contents[x * xy->row_size + y * xy->entry_size];
>  }
>  
> +static inline int xy_max_y(struct xyarray *xy)
> +{
> +	return xy->max_x;
> +}
> +
> +static inline int xy_max_x(struct xyarray *xy)
> +{
> +	return xy->max_y;
> +}

I think you should follow the standard naming
and use xyarray__max_x and xyarray__max_y

jirka