diff options
Diffstat (limited to 'include/linux/kernel.h')
| -rw-r--r-- | include/linux/kernel.h | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index d0fbc043de60..57dac7022b63 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h | |||
| @@ -143,9 +143,22 @@ extern int _cond_resched(void); | |||
| 143 | 143 | ||
| 144 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) | 144 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
| 145 | 145 | ||
| 146 | #define abs(x) ({ \ | 146 | /* |
| 147 | long __x = (x); \ | 147 | * abs() handles unsigned and signed longs, ints, shorts and chars. For all |
| 148 | (__x < 0) ? -__x : __x; \ | 148 | * input types abs() returns a signed long. |
| 149 | * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64() | ||
| 150 | * for those. | ||
| 151 | */ | ||
| 152 | #define abs(x) ({ \ | ||
| 153 | long ret; \ | ||
| 154 | if (sizeof(x) == sizeof(long)) { \ | ||
| 155 | long __x = (x); \ | ||
| 156 | ret = (__x < 0) ? -__x : __x; \ | ||
| 157 | } else { \ | ||
| 158 | int __x = (x); \ | ||
| 159 | ret = (__x < 0) ? -__x : __x; \ | ||
| 160 | } \ | ||
| 161 | ret; \ | ||
| 149 | }) | 162 | }) |
| 150 | 163 | ||
| 151 | #define abs64(x) ({ \ | 164 | #define abs64(x) ({ \ |