linux-kernel - Re: [PATCHv2 1/7] tools lib: Add bitmap

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Date:	Tue, 2 Aug 2016 09:56:16 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCHv2 1/7] tools lib: Add bitmap_alloc function

Em Tue, Aug 02, 2016 at 01:33:02PM +0200, Jiri Olsa escreveu:
> ---
> Adding bitmap_alloc function to dynamically allocate bitmap.

Why should we deviate from the kernel way of doing things, where, AFAIK,
there is no such bitmap_alloc() function?

[acme@...et linux]$ find . -type f | xargs grep -w bitmap_alloc
[acme@...et linux]$ 

- Arnaldo
 
> Link: http://lkml.kernel.org/n/tip-ictn3ke5ewrzwyn8webfeai9@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/include/linux/bitmap.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h
> index 28f5493da491..60c44b615902 100644
> --- a/tools/include/linux/bitmap.h
> +++ b/tools/include/linux/bitmap.h
> @@ -3,6 +3,7 @@
>  
>  #include <string.h>
>  #include <linux/bitops.h>
> +#include <stdlib.h>
>  
>  #define DECLARE_BITMAP(name,bits) \
>  	unsigned long name[BITS_TO_LONGS(bits)]
> @@ -65,4 +66,13 @@ static inline int test_and_set_bit(int nr, unsigned long *addr)
>  	return (old & mask) != 0;
>  }
>  
> +/**
> + * bitmap_alloc - Allocate bitmap
> + * @nr: Bit to set
> + */
> +static inline unsigned long *bitmap_alloc(int nbits)
> +{
> +	return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
> +}
> +
>  #endif /* _PERF_BITOPS_H */
> -- 
> 2.4.11