4 files changed, 50 insertions, 7 deletions
diff --git a/arch/arm/include/asm/Kbuild b/arch/arm/include/asm/Kbuild
index 55e0e3ea9cb6..efb21757d41f 100644
--- a/arch/arm/include/asm/Kbuild
+++ b/arch/arm/include/asm/Kbuild
@@ -38,3 +38,6 @@ generic-y += termios.h
 generic-y += timex.h
 generic-y += trace_clock.h
 generic-y += unaligned.h
+
+generated-y += mach-types.h
+generated-y += unistd-nr.h
diff --git a/arch/arm/include/asm/delay.h b/arch/arm/include/asm/delay.h
index b1ce037e4380..e986b7f717c4 100644
--- a/arch/arm/include/asm/delay.h
+++ b/arch/arm/include/asm/delay.h
@@ -9,6 +9,33 @@
 #include <asm/memory.h>
 #include <asm/param.h>	/* HZ */
 
+/*
+ * Loop (or tick) based delay:
+ *
+ * loops = loops_per_jiffy * jiffies_per_sec * delay_us / us_per_sec
+ *
+ * where:
+ *
+ * jiffies_per_sec = HZ
+ * us_per_sec = 1000000
+ *
+ * Therefore the constant part is HZ / 1000000 which is a small
+ * fractional number. To make this usable with integer math, we
+ * scale up this constant by 2^31, perform the actual multiplication,
+ * and scale the result back down by 2^31 with a simple shift:
+ *
+ * loops = (loops_per_jiffy * delay_us * UDELAY_MULT) >> 31
+ *
+ * where:
+ *
+ * UDELAY_MULT = 2^31 * HZ / 1000000
+ *             = (2^31 / 1000000) * HZ
+ *             = 2147.483648 * HZ
+ *             = 2147 * HZ + 483648 * HZ / 1000000
+ *
+ * 31 is the biggest scale shift value that won't overflow 32 bits for
+ * delay_us * UDELAY_MULT assuming HZ <= 1000 and delay_us <= 2000.
+ */
 #define MAX_UDELAY_MS	2
 #define UDELAY_MULT	UL(2147 * HZ + 483648 * HZ / 1000000)
 #define UDELAY_SHIFT	31
diff --git a/arch/arm/include/asm/mach-types.h b/arch/arm/include/asm/mach-types.h
deleted file mode 100644
index 948178cc6ba8..000000000000
--- a/arch/arm/include/asm/mach-types.h
+++ /dev/null
@@ -1 +0,0 @@
-#include <generated/mach-types.h>
diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
index ada0d29a660f..076090d2dbf5 100644
--- a/arch/arm/include/asm/unistd.h
+++ b/arch/arm/include/asm/unistd.h
@@ -14,12 +14,7 @@
 #define __ASM_ARM_UNISTD_H
 
 #include <uapi/asm/unistd.h>
-
-/*
- * This may need to be greater than __NR_last_syscall+1 in order to
- * account for the padding in the syscall table
- */
-#define __NR_syscalls  (400)
+#include <asm/unistd-nr.h>
 
 #define __ARCH_WANT_STAT64
 #define __ARCH_WANT_SYS_GETHOSTNAME
@@ -52,4 +47,23 @@
 #define __IGNORE_fadvise64_64
 #define __IGNORE_migrate_pages
 
+#ifdef __ARM_EABI__
+/*
+ * The following syscalls are obsolete and no longer available for EABI:
+ *  __NR_time
+ *  __NR_umount
+ *  __NR_stime
+ *  __NR_alarm
+ *  __NR_utime
+ *  __NR_getrlimit
+ *  __NR_select
+ *  __NR_readdir
+ *  __NR_mmap
+ *  __NR_socketcall
+ *  __NR_syscall
+ *  __NR_ipc
+ */
+#define __IGNORE_getrlimit
+#endif
+
 #endif /* __ASM_ARM_UNISTD_H */