include/linux/delay.h: replace kernel.h with the necessary inclusions

When kernel.h is used in the headers it adds a lot into dependency hell,
especially when there are circular dependencies are involved.

Replace kernel.h inclusion with the list of what is really being used.

[akpm@linux-foundation.org: cxd2880_common.h needs bits.h for GENMASK()]
[andriy.shevchenko@linux.intel.com: delay.h: fix for removed kernel.h]
  Link: https://lkml.kernel.org/r/20211028170143.56523-1-andriy.shevchenko@linux.intel.com
[akpm@linux-foundation.org: include/linux/fwnode.h needs bits.h for BIT()]

Link: https://lkml.kernel.org/r/20211027150324.79827-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/riscv/lib/delay.c

@@ -4,10 +4,14 @@
  */
 
 #include <linux/delay.h>
+#include <linux/math.h>
 #include <linux/param.h>
 #include <linux/timex.h>
+#include <linux/types.h>
 #include <linux/export.h>
 
+#include <asm/processor.h>
+
 /*
  * This is copies from arch/arm/include/asm/delay.h
  *

arch/s390/include/asm/facility.h

@@ -9,8 +9,12 @@
 #define __ASM_FACILITY_H
 
 #include <asm/facility-defs.h>
+
+#include <linux/minmax.h>
 #include <linux/string.h>
+#include <linux/types.h>
 #include <linux/preempt.h>
+
 #include <asm/lowcore.h>
 
 #define MAX_FACILITY_BIT (sizeof(stfle_fac_list) * 8)

drivers/media/dvb-frontends/cxd2880/cxd2880_common.h

@@ -12,6 +12,7 @@
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/delay.h>
+#include <linux/bits.h>
 #include <linux/string.h>
 
 int cxd2880_convert2s_complement(u32 value, u32 bitlen);

include/linux/delay.h

@@ -19,7 +19,7 @@
  *   https://lists.openwall.net/linux-kernel/2011/01/09/56
  */
 
-#include <linux/kernel.h>
+#include <linux/math.h>
 
 extern unsigned long loops_per_jiffy;
 

include/linux/fwnode.h

@@ -11,6 +11,7 @@
 
 #include <linux/types.h>
 #include <linux/list.h>
+#include <linux/bits.h>
 #include <linux/err.h>
 
 struct fwnode_operations;