diff options
Diffstat (limited to 'include/asm-i386/delay.h')
| -rw-r--r-- | include/asm-i386/delay.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/asm-i386/delay.h b/include/asm-i386/delay.h index b1c7650dc7b..9ae5e3782ed 100644 --- a/include/asm-i386/delay.h +++ b/include/asm-i386/delay.h @@ -7,6 +7,7 @@ * Delay routines calling functions in arch/i386/lib/delay.c */ +/* Undefined functions to get compile-time errors */ extern void __bad_udelay(void); extern void __bad_ndelay(void); @@ -15,10 +16,12 @@ extern void __ndelay(unsigned long nsecs); extern void __const_udelay(unsigned long usecs); extern void __delay(unsigned long loops); +/* 0x10c7 is 2**32 / 1000000 (rounded up) */ #define udelay(n) (__builtin_constant_p(n) ? \ ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \ __udelay(n)) - + +/* 0x5 is 2**32 / 1000000000 (rounded up) */ #define ndelay(n) (__builtin_constant_p(n) ? \ ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \ __ndelay(n)) |