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sched: Fix odd values in effective_load() calculations
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 <sasha.levin@oracle.com> Signed-off-by: Yuyang Du <yuyang.du@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Dave Jones <davej@redhat.com> Cc: Andrey Ryabinin <a.ryabinin@samsung.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/20141219002956.GA25405@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -4424,7 +4424,7 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg)
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* wl = S * s'_i; see (2)
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*/
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if (W > 0 && w < W)
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wl = (w * tg->shares) / W;
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wl = (w * (long)tg->shares) / W;
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else
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wl = tg->shares;
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