linux-kernel - Re: [PATCH v1 1/1] kernel.h: Drop inclusion in bitmap.h

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Date:   Sat, 27 Mar 2021 14:32:14 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH v1 1/1] kernel.h: Drop inclusion in bitmap.h

On Fri, Mar 26, 2021 at 07:03:47PM +0200, Andy Shevchenko wrote:
> The bitmap.h header is used in a lot of code around the kernel.
> Besides that it includes kernel.h which sometimes makes a loop.
> 
> Break the loop by introducing align.h, including it in kernel.h
> and bitmap.h followed by replacing kernel.h with limits.h.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Can you give an example of such dependency?

Nevertheless,

Acked-by: Yury Norov <yury.norov@...il.com>

> ---
>  include/linux/align.h  | 15 +++++++++++++++
>  include/linux/bitmap.h |  3 ++-
>  include/linux/kernel.h |  9 +--------
>  3 files changed, 18 insertions(+), 9 deletions(-)
>  create mode 100644 include/linux/align.h
> 
> diff --git a/include/linux/align.h b/include/linux/align.h
> new file mode 100644
> index 000000000000..2b4acec7b95a
> --- /dev/null
> +++ b/include/linux/align.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_ALIGN_H
> +#define _LINUX_ALIGN_H
> +
> +#include <linux/const.h>
> +
> +/* @a is a power of 2 value */
> +#define ALIGN(x, a)		__ALIGN_KERNEL((x), (a))
> +#define ALIGN_DOWN(x, a)	__ALIGN_KERNEL((x) - ((a) - 1), (a))
> +#define __ALIGN_MASK(x, mask)	__ALIGN_KERNEL_MASK((x), (mask))
> +#define PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a)))
> +#define PTR_ALIGN_DOWN(p, a)	((typeof(p))ALIGN_DOWN((unsigned long)(p), (a)))
> +#define IS_ALIGNED(x, a)		(((x) & ((typeof(x))(a) - 1)) == 0)
> +
> +#endif	/* _LINUX_ALIGN_H */
> diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
> index 70a932470b2d..6cbcd9d9edd2 100644
> --- a/include/linux/bitmap.h
> +++ b/include/linux/bitmap.h
> @@ -4,10 +4,11 @@
>  
>  #ifndef __ASSEMBLY__
>  
> +#include <linux/align.h>
>  #include <linux/types.h>
>  #include <linux/bitops.h>
> +#include <linux/limits.h>
>  #include <linux/string.h>
> -#include <linux/kernel.h>
>  
>  /*
>   * bitmaps provide bit arrays that consume one or more unsigned
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 5b7ed6dc99ac..09035ac67d4b 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -3,6 +3,7 @@
>  #define _LINUX_KERNEL_H
>  
>  #include <stdarg.h>
> +#include <linux/align.h>
>  #include <linux/limits.h>
>  #include <linux/linkage.h>
>  #include <linux/stddef.h>
> @@ -30,14 +31,6 @@
>   */
>  #define REPEAT_BYTE(x)	((~0ul / 0xff) * (x))
>  
> -/* @a is a power of 2 value */
> -#define ALIGN(x, a)		__ALIGN_KERNEL((x), (a))
> -#define ALIGN_DOWN(x, a)	__ALIGN_KERNEL((x) - ((a) - 1), (a))
> -#define __ALIGN_MASK(x, mask)	__ALIGN_KERNEL_MASK((x), (mask))
> -#define PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a)))
> -#define PTR_ALIGN_DOWN(p, a)	((typeof(p))ALIGN_DOWN((unsigned long)(p), (a)))
> -#define IS_ALIGNED(x, a)		(((x) & ((typeof(x))(a) - 1)) == 0)
> -
>  /* generic data direction definitions */
>  #define READ			0
>  #define WRITE			1
> -- 
> 2.30.2