diff options
| -rw-r--r-- | include/asm-generic/delay.h | 33 |
1 files changed, 27 insertions, 6 deletions
diff --git a/include/asm-generic/delay.h b/include/asm-generic/delay.h index 6511b99c5f17..0f79054ce7cd 100644 --- a/include/asm-generic/delay.h +++ b/include/asm-generic/delay.h @@ -10,14 +10,35 @@ extern void __ndelay(unsigned long nsecs); extern void __const_udelay(unsigned long xloops); extern void __delay(unsigned long loops); +/* + * The weird n/20000 thing suppresses a "comparison is always false due to + * limited range of data type" warning with non-const 8-bit arguments. + */ + /* 0x10c7 is 2**32 / 1000000 (rounded up) */ -#define udelay(n) (__builtin_constant_p(n) ? \ - ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \ - __udelay(n)) +#define udelay(n) \ + ({ \ + if (__builtin_constant_p(n)) { \ + if ((n) / 20000 >= 1) \ + __bad_udelay(); \ + else \ + __const_udelay((n) * 0x10c7ul); \ + } else { \ + __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)) +#define ndelay(n) \ + ({ \ + if (__builtin_constant_p(n)) { \ + if ((n) / 20000 >= 1) \ + __bad_ndelay(); \ + else \ + __const_udelay((n) * 5ul); \ + } else { \ + __ndelay(n); \ + } \ + }) #endif /* __ASM_GENERIC_DELAY_H */ |