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sched/deadline: Test for CPU's presence explicitly

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A hot-removed CPU may have ID that is numerically larger than the number of
existing CPUs in the system (e.g. we can unplug CPU 4 from a system that
has CPUs 0, 1 and 4).

Thus the WARN_ONs should check whether the CPU in question is currently
present, not whether its ID value is less than num_present_cpus().

Cc: Ingo Molnar <[email protected]>
Cc: Juri Lelli <[email protected]>
Cc: Steven Rostedt <[email protected]>
Reported-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: Boris Ostrovsky <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Boris Ostrovsky authored and Thomas Gleixner committed 2014-02-21 21:27:10 +01:00
1 parent 6d35ab4809
commit 82b95800b2
1 file changed
+3 -3
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kernel/sched/cpudeadline.c
+3 -3
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@@ -70,7 +70,7 @@ static void cpudl_heapify(struct cpudl *cp, int idx)
static void cpudl_change_key(struct cpudl *cp, int idx, u64 new_dl)
{
WARN_ON(idx > num_present_cpus() || idx == IDX_INVALID);
WARN_ON(!cpu_present(idx) || idx == IDX_INVALID);
if (dl_time_before(new_dl, cp->elements[idx].dl)) {
cp->elements[idx].dl = new_dl;
@@ -117,7 +117,7 @@ int cpudl_find(struct cpudl *cp, struct task_struct *p,
}
out:
WARN_ON(best_cpu > num_present_cpus() && best_cpu != -1);
WARN_ON(!cpu_present(best_cpu) && best_cpu != -1);
return best_cpu;
}
@@ -137,7 +137,7 @@ void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid)
int old_idx, new_cpu;
unsigned long flags;
WARN_ON(cpu > num_present_cpus());
WARN_ON(!cpu_present(cpu));
raw_spin_lock_irqsave(&cp->lock, flags);
old_idx = cp->cpu_to_idx[cpu];