linux/kernel.h: split *_MAX and *_MIN macros into <linux/limits.h>

<linux/kernel.h> tends to be cluttered because we often put various sort
of unrelated stuff in it.  So, we have split out a sensible chunk of
code into a separate header from time to time.

This commit splits out the *_MAX and *_MIN defines.

The standard header <limits.h> contains various MAX, MIN constants
including numerial limits.  [1]

I think it makes sense to move in-kernel MAX, MIN constants into
include/linux/limits.h.

We already have include/uapi/linux/limits.h to contain some user-space
constants.  I changed its include guard to _UAPI_LINUX_LIMITS_H.  This
change has no impact to the user-space because
scripts/headers_install.sh rips off the '_UAPI' prefix from the include
guards of exported headers.

[1] http://pubs.opengroup.org/onlinepubs/009604499/basedefs/limits.h.html

Link: http://lkml.kernel.org/r/1549156242-20806-2-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Alex Elder <elder@linaro.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 37 insertions, 28 deletions

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index a9ff66977e10..34a5036debd3 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -4,6 +4,7 @@
 
 
 #include <stdarg.h>
+#include <linux/limits.h>
 #include <linux/linkage.h>
 #include <linux/stddef.h>
 #include <linux/types.h>
@@ -17,34 +18,6 @@
 #include <asm/div64.h>
 #include <uapi/linux/kernel.h>
 
-#define USHRT_MAX       ((unsigned short)~0U)
-#define SHRT_MAX        ((short)(USHRT_MAX>>1))
-#define SHRT_MIN        ((short)(-SHRT_MAX - 1))
-#define INT_MAX         ((int)(~0U>>1))
-#define INT_MIN         (-INT_MAX - 1)
-#define UINT_MAX        (~0U)
-#define LONG_MAX        ((long)(~0UL>>1))
-#define LONG_MIN        (-LONG_MAX - 1)
-#define ULONG_MAX       (~0UL)
-#define LLONG_MAX       ((long long)(~0ULL>>1))
-#define LLONG_MIN       (-LLONG_MAX - 1)
-#define ULLONG_MAX      (~0ULL)
-#define SIZE_MAX        (~(size_t)0)
-#define PHYS_ADDR_MAX   (~(phys_addr_t)0)
-
-#define U8_MAX          ((u8)~0U)
-#define S8_MAX          ((s8)(U8_MAX>>1))
-#define S8_MIN          ((s8)(-S8_MAX - 1))
-#define U16_MAX         ((u16)~0U)
-#define S16_MAX         ((s16)(U16_MAX>>1))
-#define S16_MIN         ((s16)(-S16_MAX - 1))
-#define U32_MAX         ((u32)~0U)
-#define S32_MAX         ((s32)(U32_MAX>>1))
-#define S32_MIN         ((s32)(-S32_MAX - 1))
-#define U64_MAX         ((u64)~0ULL)
-#define S64_MAX         ((s64)(U64_MAX>>1))
-#define S64_MIN         ((s64)(-S64_MAX - 1))
-
 #define STACK_MAGIC     0xdeadbeef
 
 /**
diff --git a/include/linux/limits.h b/include/linux/limits.h
new file mode 100644
index 000000000000..76afcd24ff8c
--- /dev/null
+++ b/include/linux/limits.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_LIMITS_H
+#define _LINUX_LIMITS_H
+
+#include <uapi/linux/limits.h>
+#include <linux/types.h>
+
+#define USHRT_MAX       ((unsigned short)~0U)
+#define SHRT_MAX        ((short)(USHRT_MAX >> 1))
+#define SHRT_MIN        ((short)(-SHRT_MAX - 1))
+#define INT_MAX         ((int)(~0U >> 1))
+#define INT_MIN         (-INT_MAX - 1)
+#define UINT_MAX        (~0U)
+#define LONG_MAX        ((long)(~0UL >> 1))
+#define LONG_MIN        (-LONG_MAX - 1)
+#define ULONG_MAX       (~0UL)
+#define LLONG_MAX       ((long long)(~0ULL >> 1))
+#define LLONG_MIN       (-LLONG_MAX - 1)
+#define ULLONG_MAX      (~0ULL)
+#define SIZE_MAX        (~(size_t)0)
+#define PHYS_ADDR_MAX   (~(phys_addr_t)0)
+
+#define U8_MAX          ((u8)~0U)
+#define S8_MAX          ((s8)(U8_MAX >> 1))
+#define S8_MIN          ((s8)(-S8_MAX - 1))
+#define U16_MAX         ((u16)~0U)
+#define S16_MAX         ((s16)(U16_MAX >> 1))
+#define S16_MIN         ((s16)(-S16_MAX - 1))
+#define U32_MAX         ((u32)~0U)
+#define S32_MAX         ((s32)(U32_MAX >> 1))
+#define S32_MIN         ((s32)(-S32_MAX - 1))
+#define U64_MAX         ((u64)~0ULL)
+#define S64_MAX         ((s64)(U64_MAX >> 1))
+#define S64_MIN         ((s64)(-S64_MAX - 1))
+
+#endif /* _LINUX_LIMITS_H */