There are two expressions in kernel/sched.c that are always false since
they test for <0 but the result of the expression is unsigned so they will
never be less than zero. This patch implement the logic that I believe is
intended without the signedness issue and without the nasty casts.
<disclaimer>patch is compile tested only</disclaimer>
Signed-off-by: Jesper Juhl <[email protected]>
---
sched.c | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
--- linux-2.6.12-rc2-mm3-orig/kernel/sched.c 2005-04-11 21:20:56.000000000 +0200
+++ linux-2.6.12-rc2-mm3/kernel/sched.c 2005-04-15 01:37:48.000000000 +0200
@@ -2697,9 +2697,10 @@ need_resched_nonpreemptible:
schedstat_inc(rq, sched_cnt);
now = sched_clock();
if (likely((long long)now - prev->timestamp < NS_MAX_SLEEP_AVG)) {
- run_time = now - prev->timestamp;
- if (unlikely((long long)now - prev->timestamp < 0))
+ if (unlikely(prev->timestamp > now))
run_time = 0;
+ else
+ run_time = now - prev->timestamp;
} else
run_time = NS_MAX_SLEEP_AVG;
@@ -2776,7 +2777,7 @@ go_idle:
if (!rt_task(next) && next->activated > 0) {
unsigned long long delta = now - next->timestamp;
- if (unlikely((long long)now - next->timestamp < 0))
+ if (unlikely(next->timestamp > now))
delta = 0;
if (next->activated == 1)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]