linux-kernel - Re: [PATCH v1 2/3] perf mmap: declare type for cpu mask of arbitrary length

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Message-ID: <20191122131513.GE17308@krava>
Date:   Fri, 22 Nov 2019 14:20:35 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/3] perf mmap: declare type for cpu mask of arbitrary
 length

On Wed, Nov 20, 2019 at 12:37:48PM +0300, Alexey Budankov wrote:
> 
> Declare a dedicated struct map_cpu_mask type for cpu masks of 
> arbitrary length. Mask is available thru bits pointer and the 
> mask length is kept in nbits field. mmap_cpu_mask_bytes() macro 
> returns mask storage size in bytes.
> 
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> ---
>  tools/perf/util/mmap.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
> index bee4e83f7109..a218a0eb1466 100644
> --- a/tools/perf/util/mmap.h
> +++ b/tools/perf/util/mmap.h
> @@ -15,6 +15,15 @@
>  #include "event.h"
>  
>  struct aiocb;
> +
> +struct mmap_cpu_mask {
> +	unsigned long *bits;
> +	size_t nbits;
> +};
> +
> +#define mmap_cpu_mask_bytes(m) \

we try to have all macros upper case

> +	(BITS_TO_LONGS(((struct mmap_cpu_mask *)m)->nbits) * sizeof(unsigned long))

we have BITS_TO_BYTES

thanks,
jirka

> +
>  /**
>   * struct mmap - perf's ring buffer mmap details
>   *
> -- 
> 2.20.1
>