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kernel: Add snapshot of changes to support cpu isolation

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This snapshot is taken from msm-4.19 as of commit 5debecbe7195
("trace: filter out spurious preemption and IRQs disable traces").

Change-Id: I222aa448ac68f7365065f62dba9db94925da38a0
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
This commit is contained in:
Satya Durga Srinivasu Prabhala 2019-09-17 10:34:18 -07:00
commit 201ea48219
20 changed files with 398 additions and 77 deletions
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11
kernel/cpu.c
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@ -990,6 +990,9 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen,
if (!cpu_present(cpu))
return -EINVAL;
if (!tasks_frozen && !cpu_isolated(cpu) && num_online_uniso_cpus() == 1)
return -EBUSY;
cpus_write_lock();
if (trace_cpuhp_latency_enabled())
start_time = sched_clock();
@ -2377,6 +2380,9 @@ EXPORT_SYMBOL(__cpu_present_mask);
struct cpumask __cpu_active_mask __read_mostly;
EXPORT_SYMBOL(__cpu_active_mask);
struct cpumask __cpu_isolated_mask __read_mostly;
EXPORT_SYMBOL(__cpu_isolated_mask);
atomic_t __num_online_cpus __read_mostly;
EXPORT_SYMBOL(__num_online_cpus);
@ -2395,6 +2401,11 @@ void init_cpu_online(const struct cpumask *src)
cpumask_copy(&__cpu_online_mask, src);
}
void init_cpu_isolated(const struct cpumask *src)
{
cpumask_copy(&__cpu_isolated_mask, src);
}
void set_cpu_online(unsigned int cpu, bool online)
{
/*