scaled down weight 'fact' would not be > u32 rather than unlikely as the
values being passed for delta is either NICE_O_LOAD or the weight of the
'se' which would be a value that can be accomodated in a u32. Remove the
initial > u32 handling on 'fact'.
9dbdb15553239 ("sched/fair: Rework sched_fair time accounting") in
addition to fixing the original issue of time moving backwards elsewhere
in the code, handled delta > u32 case (due to NO_HZ_FULL) which brought
in as it's part the change changed here. The hunk being removed here
would not make a difference to it as this is on scaled weight > u32.
And pre-"9dbdb15553239" doesn't seem to have logical equivalent of hunk
removed here either.
Signed-off-by: Afzal Mohammed <afzal.mohd...@gmail.com>
---
System here (that mainly does kernel build) has been running with this
change for last couple of weeks without any issue observed.
kernel/sched/fair.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 3d57cc0ca0a6..0cc58a7bdd16 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -218,13 +218,6 @@ static u64 __calc_delta(u64 delta_exec, unsigned long
weight, struct load_weight
__update_inv_weight(lw);
- if (unlikely(fact >> 32)) {
- while (fact >> 32) {
- fact >>= 1;
- shift--;
- }
- }
-
/* hint to use a 32x32->64 mul */
fact = (u64)(u32)fact * lw->inv_weight;
--
2.1.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
