The patch titled
Subject: linux/kernel.h: split *_MAX and *_MIN macros into <linux/limits.h>
has been added to the -mm tree. Its filename is
linux-kernelh-split-_max-and-_min-macros-into-linux-limitsh.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/linux-kernelh-split-_max-and-_min-macros-into-linux-limitsh.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/linux-kernelh-split-_max-and-_min-macros-into-linux-limitsh.patch
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From: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxx
Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: Alex Elder <elder@xxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Zhang Yanmin <yanmin.zhang@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/include/linux/kernel.h~linux-kernelh-split-_max-and-_min-macros-into-linux-limitsh
+++ a/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
/**
--- /dev/null
+++ a/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 */
--- a/include/uapi/linux/limits.h~linux-kernelh-split-_max-and-_min-macros-into-linux-limitsh
+++ a/include/uapi/linux/limits.h
@@ -1,6 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _LINUX_LIMITS_H
-#define _LINUX_LIMITS_H
+#ifndef _UAPI_LINUX_LIMITS_H
+#define _UAPI_LINUX_LIMITS_H
#define NR_OPEN 1024
_
Patches currently in -mm which might be from yamada.masahiro@xxxxxxxxxxxxx are
rename-include-uapi-=-asm-generic-shmparamh-really.patch
linux-kernelh-use-short-to-define-ushrt_max-shrt_max-shrt_min.patch
linux-kernelh-split-_max-and-_min-macros-into-linux-limitsh.patch
