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sched: Fix odd values in effective_load() calculations

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In effective_load, we have (long w * unsigned long tg->shares) / long W,
when w is negative, it is cast to unsigned long and hence the product is
insanely large. Fix this by casting tg->shares to long.

Reported-by: Sasha Levin <[email protected]>
Signed-off-by: Yuyang Du <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Dave Jones <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Yuyang Du authored and Ingo Molnar committed 2015-01-09 11:18:54 +01:00
1 parent 536ebe9ca9
commit 32a8df4e0b
1 file changed
+1 -1
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kernel/sched/fair.c
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@@ -4424,7 +4424,7 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg)
* wl = S * s'_i; see (2)
*/
if (W > 0 && w < W)
wl = (w * tg->shares) / W;
wl = (w * (long)tg->shares) / W;
else
wl = tg->shares;