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

From: Yury Norov
Date: Sat Mar 27 2021 - 17:33:14 EST


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@xxxxxxxxxxxxxxx>

Can you give an example of such dependency?

Nevertheless,

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

> ---
> 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