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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-kernel@vger.kernel.org, lizefan@huawei.com,
	mingo@kernel.org, tglx@linutronix.de, josh@joshtriplett.org,
	yury.norov@gmail.com, peterz@infradead.org, paulmck@kernel.org,
	fweisbec@gmail.com, linux@rasmusvillemoes.dk
Subject: Re: [PATCH 5/8] lib: bitmap_getnum: separate arg into region and field
Date: Tue, 26 Jan 2021 23:23:43 +0200	[thread overview]
Message-ID: <YBCIXzUkgjcCTprv@smile.fi.intel.com> (raw)
In-Reply-To: <20210126171141.122639-6-paul.gortmaker@windriver.com>

On Tue, Jan 26, 2021 at 12:11:38PM -0500, Paul Gortmaker wrote:
> The bitmap_getnum is only used on a region's start/end/off/group_len
> field.  Trivially decouple the region from the field so that the region
> pointer is available for a pending change.

Honestly, I don't like this macro trick. It's bad in couple of ways:
 - it hides what actually is done with the fields of r structure
   (after you get that they are fields!)
 - it breaks possibility to compile time (type) checks

I will listen what others say, but I'm in favour not to proceed like this.

> Cc: Yury Norov <yury.norov@gmail.com>
> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
> ---
>  lib/bitmap.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/bitmap.c b/lib/bitmap.c
> index 833f152a2c43..f65be2f148fd 100644
> --- a/lib/bitmap.c
> +++ b/lib/bitmap.c
> @@ -533,6 +533,7 @@ static const char *bitmap_getnum(const char *str, unsigned int *num)
>  	*num = n;
>  	return str + len;
>  }
> +#define bitmap_getrnum(s, r, pos) bitmap_getnum(s, &(r->pos))
>  
>  static inline bool end_of_str(char c)
>  {
> @@ -571,7 +572,7 @@ static const char *bitmap_find_region_reverse(const char *start, const char *end
>  
>  static const char *bitmap_parse_region(const char *str, struct region *r)
>  {
> -	str = bitmap_getnum(str, &r->start);
> +	str = bitmap_getrnum(str, r, start);
>  	if (IS_ERR(str))
>  		return str;
>  
> @@ -581,7 +582,7 @@ static const char *bitmap_parse_region(const char *str, struct region *r)
>  	if (*str != '-')
>  		return ERR_PTR(-EINVAL);
>  
> -	str = bitmap_getnum(str + 1, &r->end);
> +	str = bitmap_getrnum(str + 1, r, end);
>  	if (IS_ERR(str))
>  		return str;
>  
> @@ -591,14 +592,14 @@ static const char *bitmap_parse_region(const char *str, struct region *r)
>  	if (*str != ':')
>  		return ERR_PTR(-EINVAL);
>  
> -	str = bitmap_getnum(str + 1, &r->off);
> +	str = bitmap_getrnum(str + 1, r, off);
>  	if (IS_ERR(str))
>  		return str;
>  
>  	if (*str != '/')
>  		return ERR_PTR(-EINVAL);
>  
> -	return bitmap_getnum(str + 1, &r->group_len);
> +	return bitmap_getrnum(str + 1, r, group_len);
>  
>  no_end:
>  	r->end = r->start;
> -- 
> 2.17.1
> 

-- 
With Best Regards,
Andy Shevchenko



  reply	other threads:[~2021-01-27  5:37 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-26 17:11 [PATCH v3 0/8] support for bitmap (and hence CPU) list "N" abbreviation Paul Gortmaker
2021-01-26 17:11 ` [PATCH 1/8] lib: test_bitmap: clearly separate ERANGE from EINVAL tests Paul Gortmaker
2021-01-26 21:04   ` Andy Shevchenko
2021-01-27  7:21     ` Paul Gortmaker
2021-01-26 17:11 ` [PATCH 2/8] lib: test_bitmap: add more start-end:offset/len tests Paul Gortmaker
2021-01-26 21:11   ` Andy Shevchenko
2021-01-27  3:03   ` Yury Norov
2021-01-26 17:11 ` [PATCH 3/8] lib: bitmap: fold nbits into region struct Paul Gortmaker
2021-01-26 21:16   ` Andy Shevchenko
2021-01-26 21:18     ` Andy Shevchenko
2021-01-27  8:02     ` Paul Gortmaker
2021-01-28  0:47       ` Yury Norov
2021-01-28 10:17         ` Andy Shevchenko
2021-01-27  3:08   ` Yury Norov
2021-01-26 17:11 ` [PATCH 4/8] lib: bitmap: move ERANGE check from set_region to check_region Paul Gortmaker
2021-01-26 21:19   ` Andy Shevchenko
2021-01-27  3:12   ` Yury Norov
2021-01-26 17:11 ` [PATCH 5/8] lib: bitmap_getnum: separate arg into region and field Paul Gortmaker
2021-01-26 21:23   ` Andy Shevchenko [this message]
2021-01-27  2:58     ` Yury Norov
2021-01-27  8:38       ` Paul Gortmaker
2021-01-26 17:11 ` [PATCH 6/8] lib: bitmap: support "N" as an alias for size of bitmap Paul Gortmaker
2021-01-26 21:37   ` Andy Shevchenko
2021-01-26 21:41     ` Andy Shevchenko
2021-01-27 17:57       ` Yury Norov
2021-01-27  8:20     ` Paul Gortmaker
2021-01-26 17:11 ` [PATCH 7/8] lib: test_bitmap: add tests for "N" alias Paul Gortmaker
2021-01-26 17:11 ` [PATCH 8/8] rcu: deprecate "all" option to rcu_nocbs= Paul Gortmaker
2021-01-26 21:36   ` Yury Norov
2021-01-26 22:17     ` Paul E. McKenney
2021-01-26 22:27 ` [PATCH v3 0/8] support for bitmap (and hence CPU) list "N" abbreviation Yury Norov
2021-01-27  9:12   ` Paul Gortmaker

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