[PATCH AUTOSEL 4.19 74/79] libfdt: define INT32_MAX and UINT32_MAX in libfdt_env.h

Sasha Levin
2019-12-11T15:35:00Z

From: Masahiro Yamada <yamada.masahiro@socionext.com>

[ Upstream commit a8de1304b7df30e3a14f2a8b9709bb4ff31a0385 ]

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>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 b36c0289a308e..6a0f1f524466e 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 2abc8e83b95e9..9757d4f6331e7 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 edb0f0c309044..1adf54aad2df1 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;
--
2.20.1