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ANDROID: cpuhp/aarch32: keep last 32bit cpu active

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It is possible that all the 32 bit CPUs are paused in
the system, which is not ideal for quickly launching
32 bit apps.

Detect if a pause operation is about to pause the
last 32 bit CPU, and prevent it from happening.

Bug: 175896474
Change-Id: I21b4dad7ba9f3ef9be460137098e6fb2c0e336e6
Signed-off-by: Stephen Dickey <dickey@codeaurora.org>
This commit is contained in:
Stephen Dickey 2021-02-09 23:01:11 -08:00 committed by Quentin Perret
parent b129c98dc6
commit 9393bb52f8
1 changed files with 2 additions and 1 deletions
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3
kernel/cpu.c
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@ -1153,7 +1153,8 @@ int pause_cpus(struct cpumask *cpus)
cpumask_and(cpus, cpus, cpu_active_mask);
for_each_cpu(cpu, cpus) {
if (!cpu_online(cpu) || dl_cpu_busy(cpu)) {
if (!cpu_online(cpu) || dl_cpu_busy(cpu) ||
get_cpu_device(cpu)->offline_disabled == true) {
err = -EBUSY;
goto err_cpu_maps_update;
}