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Subject[PATCH 3/3] libfdt: define INT32_MAX and UINT32_MAX in libfdt_env.h
The libfdt in the upstream DTC project added references to (U)INT32_MAX
by the following commits:

Commit 812b1956a076 ("libfdt: Tweak data handling to satisfy Coverity")
Commit 7fcf8208b8a9 ("libfdt: add fdt_append_addrrange()")

The kernel needs to adjust libfdt_env.h before pulling in the changes.

As for the user-space programs, <stdint.h> defines (U)INT32_MAX along
with (u)int32_t.

In the kernel, on the other hand, we usually use s32 / u32 instead of
(u)int32_t for the fixed-width types.

Accordingly, we already have S32_MAX / U32_MAX for their max values.
So, we won't add (U)INT32_MAX to <linux/limits.h> any more.

Instead, add them to the in-kernel libfdt_env.h to compile fdt.c and

Signed-off-by: Masahiro Yamada <>

arch/powerpc/boot/libfdt_env.h | 2 ++
include/linux/libfdt_env.h | 3 +++
2 files changed, 5 insertions(+)

diff --git a/arch/powerpc/boot/libfdt_env.h b/arch/powerpc/boot/libfdt_env.h
index 2abc8e83b95e..a4a386114ef5 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 INT32_MAX ((u32)~0U)
+#define UINT32_MAX ((s32)(INT_MAX >> 1))

#include "of.h"

diff --git a/include/linux/libfdt_env.h b/include/linux/libfdt_env.h
index edb0f0c30904..0bd83bdb2482 100644
--- a/include/linux/libfdt_env.h
+++ b/include/linux/libfdt_env.h
@@ -11,6 +11,9 @@ typedef __be16 fdt16_t;
typedef __be32 fdt32_t;
typedef __be64 fdt64_t;

+#define INT32_MAX S32_MAX
+#define UINT32_MAX U32_MAX
#define fdt32_to_cpu(x) be32_to_cpu(x)
#define cpu_to_fdt32(x) cpu_to_be32(x)
#define fdt64_to_cpu(x) be64_to_cpu(x)
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