diff options
| author | Chunwei Chen <[email protected]> | 2014-02-25 17:16:55 +0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2014-04-14 09:32:01 -0700 |
| commit | 545e9ac00a813ed13d6b67c86d058c9048d78552 (patch) | |
| tree | 9164a7e2f9949ba173346cf2daddf5be4f6bba2a /include | |
| parent | 6c48cd8ac223eb00cb4dadebcbe4ce1dfdfc6b76 (diff) | |
Add ddi_time_after and friends
When comparing times gotten from ddi_get_lbolt, we have to take account of
wrap around of jiffies. Therefore, we cannot use 't1 < t2'. Instead we should
use 't1 - t2 < 0'.
This patch add ddi_time_after and friends to address this issue. They have
strict type restriction, clock_t for vanilla and int64_t for 64 version, to
prevent type conversion from screwing things.
Signed-off-by: Chunwei Chen <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #335
Diffstat (limited to 'include')
| -rw-r--r-- | include/sys/timer.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/sys/timer.h b/include/sys/timer.h index 2542510dd..33d577e71 100644 --- a/include/sys/timer.h +++ b/include/sys/timer.h @@ -35,6 +35,20 @@ #define ddi_get_lbolt() ((clock_t)jiffies) #define ddi_get_lbolt64() ((int64_t)get_jiffies_64()) +#define ddi_time_before(a, b) (typecheck(clock_t, a) && \ + typecheck(clock_t, b) && \ + ((a) - (b) < 0)) +#define ddi_time_after(a, b) ddi_time_before(b, a) +#define ddi_time_before_eq(a, b) (!ddi_time_after(a, b)) +#define ddi_time_after_eq(a, b) ddi_time_before_eq(b, a) + +#define ddi_time_before64(a, b) (typecheck(int64_t, a) && \ + typecheck(int64_t, b) && \ + ((a) - (b) < 0)) +#define ddi_time_after64(a, b) ddi_time_before64(b, a) +#define ddi_time_before_eq64(a, b) (!ddi_time_after64(a, b)) +#define ddi_time_after_eq64(a, b) ddi_time_before_eq64(b, a) + #define delay(ticks) schedule_timeout_uninterruptible(ticks) #define SEC_TO_TICK(sec) ((sec) * HZ) |