Re: [PATCH v3] libfdt: define INT32_MAX and UINT32_MAX in libfdt_env.h

Masahiro Yamada
2019-11-25T01:36:12Z

On Wed, Nov 13, 2019 at 4:13 PM Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
>
> The DTC v1.5.1 added references to (U)INT32_MAX.
>
> This is no problem for user-space programs since <stdint.h> defines
> (U)INT32_MAX along with (u)int32_t.
>
> For the kernel space, libfdt_env.h needs to be adjusted before we
> pull in the changes.
>
> In the kernel, we usually use s/u32 instead of (u)int32_t for the
> fixed-width types.
>
> Accordingly, we already have S/U32_MAX for their max values.
> So, we should not add (U)INT32_MAX to <linux/limits.h> any more.
>
> Instead, add them to the in-kernel libfdt_env.h to compile the
> latest libfdt.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---

Please let me ping this
in case this is useful for future resync.

>
> My initial plan was to change this in a series of 3 patches
> since it is clean, and reduces the code.
>
> [1/3] https://lore.kernel.org/patchwork/patch/1147095/
> [2/3] https://lore.kernel.org/patchwork/patch/1147096/
> [3/3] https://lore.kernel.org/patchwork/patch/1147097/
>
> 1/3 is stuck in the license bikeshed.
>
> For 2/3, I have not been able to get Ack from Russell.
>
> So, I chose a straight-forward fixup.
>
>
> Changes in v3:
> - Resend as a single patch
>
> arch/arm/boot/compressed/libfdt_env.h | 4 +++-
> arch/powerpc/boot/libfdt_env.h | 2 ++
> include/linux/libfdt_env.h | 3 +++
> 3 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/compressed/libfdt_env.h b/arch/arm/boot/compressed/libfdt_env.h
> index b36c0289a308..6a0f1f524466 100644
> --- a/arch/arm/boot/compressed/libfdt_env.h
> +++ b/arch/arm/boot/compressed/libfdt_env.h
> @@ -2,11 +2,13 @@
> #ifndef _ARM_LIBFDT_ENV_H
> #define _ARM_LIBFDT_ENV_H
>
> +#include <linux/limits.h>
> #include <linux/types.h>
> #include <linux/string.h>
> #include <asm/byteorder.h>
>
> -#define INT_MAX ((int)(~0U>>1))
> +#define INT32_MAX S32_MAX
> +#define UINT32_MAX U32_MAX
>
> typedef __be16 fdt16_t;
> typedef __be32 fdt32_t;
> diff --git a/arch/powerpc/boot/libfdt_env.h b/arch/powerpc/boot/libfdt_env.h
> index 2abc8e83b95e..9757d4f6331e 100644
> --- a/arch/powerpc/boot/libfdt_env.h
> +++ b/arch/powerpc/boot/libfdt_env.h
> @@ -6,6 +6,8 @@
> #include <string.h>
>
> #define INT_MAX ((int)(~0U>>1))
> +#define UINT32_MAX ((u32)~0U)
> +#define INT32_MAX ((s32)(UINT32_MAX >> 1))
>
> #include "of.h"
>
> diff --git a/include/linux/libfdt_env.h b/include/linux/libfdt_env.h
> index edb0f0c30904..1adf54aad2df 100644
> --- a/include/linux/libfdt_env.h
> +++ b/include/linux/libfdt_env.h
> @@ -7,6 +7,9 @@
>
> #include <asm/byteorder.h>
>
> +#define INT32_MAX S32_MAX
> +#define UINT32_MAX U32_MAX
> +
> typedef __be16 fdt16_t;
> typedef __be32 fdt32_t;
> typedef __be64 fdt64_t;
> --
> 2.17.1
>
>
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--
Best Regards
Masahiro Yamada