include: linux: Update kernel.h

Its contents were moved into const.h and sysinfo.h, apply these changes
to the cached copies. Fixes for the following warning when compiling
xtables-monitor.c with new kernel headers in /usr/include:

| In file included from ../include/linux/netfilter/x_tables.h:3,
|                  from ../include/xtables.h:19,
|                  from xtables-monitor.c:36:
| ../include/linux/kernel.h:7: warning: "__ALIGN_KERNEL" redefined
|     7 | #define __ALIGN_KERNEL(x, a)            __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
|       |
| In file included from /usr/include/linux/netlink.h:5,
|                  from /home/n0-1/git/libmnl/install/include/libmnl/libmnl.h:9,
|                  from xtables-monitor.c:30:
| /usr/include/linux/const.h:31: note: this is the location of the previous definition
|    31 | #define __ALIGN_KERNEL(x, a)            __ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1)
|       |

Signed-off-by: Phil Sutter <phil@nwl.cc>

1 files changed, 36 insertions, 0 deletions

diff --git a/include/linux/const.h b/include/linux/const.h
new file mode 100644
index 00000000..1eb84b50
--- /dev/null
+++ b/include/linux/const.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* const.h: Macros for dealing with constants.  */
+
+#ifndef _LINUX_CONST_H
+#define _LINUX_CONST_H
+
+/* Some constant macros are used in both assembler and
+ * C code.  Therefore we cannot annotate them always with
+ * 'UL' and other type specifiers unilaterally.  We
+ * use the following macros to deal with this.
+ *
+ * Similarly, _AT() will cast an expression with a type in C, but
+ * leave it unchanged in asm.
+ */
+
+#ifdef __ASSEMBLY__
+#define _AC(X,Y)	X
+#define _AT(T,X)	X
+#else
+#define __AC(X,Y)	(X##Y)
+#define _AC(X,Y)	__AC(X,Y)
+#define _AT(T,X)	((T)(X))
+#endif
+
+#define _UL(x)		(_AC(x, UL))
+#define _ULL(x)		(_AC(x, ULL))
+
+#define _BITUL(x)	(_UL(1) << (x))
+#define _BITULL(x)	(_ULL(1) << (x))
+
+#define __ALIGN_KERNEL(x, a)		__ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1)
+#define __ALIGN_KERNEL_MASK(x, mask)	(((x) + (mask)) & ~(mask))
+
+#define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
+
+#endif /* _LINUX_CONST_H */