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| author | Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> | 2008-06-27 13:41:36 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-27 14:31:45 +0200 |
| commit | 243e0e7b7d3b54749ece2e879ecd7e2a11874443 (patch) | |
| tree | 0dd6af7eb63d261d15d3720f77a9430387e3db42 /kernel | |
| parent | 2398f2c6d34b43025f274fc42eaca34d23ec2320 (diff) | |
| download | linux-243e0e7b7d3b54749ece2e879ecd7e2a11874443.tar.gz linux-243e0e7b7d3b54749ece2e879ecd7e2a11874443.tar.bz2 linux-243e0e7b7d3b54749ece2e879ecd7e2a11874443.zip | |
sched: fix mult overflow
It was observed these mults can overflow.
Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched_fair.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 0d197be3e3e9..26ebe180cdea 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1477,7 +1477,7 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest, struct cfs_rq *busiest_cfs_rq = tg->cfs_rq[busiest_cpu]; unsigned long busiest_h_load = busiest_cfs_rq->h_load; unsigned long busiest_weight = busiest_cfs_rq->load.weight; - long rem_load, moved_load; + u64 rem_load, moved_load; /* * empty group @@ -1485,8 +1485,8 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest, if (!busiest_cfs_rq->task_weight) continue; - rem_load = rem_load_move * busiest_weight; - rem_load /= busiest_h_load + 1; + rem_load = (u64)rem_load_move * busiest_weight; + rem_load = div_u64(rem_load, busiest_h_load + 1); moved_load = __load_balance_fair(this_rq, this_cpu, busiest, rem_load, sd, idle, all_pinned, this_best_prio, @@ -1496,7 +1496,7 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest, continue; moved_load *= busiest_h_load; - moved_load /= busiest_weight + 1; + moved_load = div_u64(moved_load, busiest_weight + 1); rem_load_move -= moved_load; if (rem_load_move < 0) |