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arm: topology: fix the topology reset path during init

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init_cpu_topology has a bug where
1. It's referring to out of bounds array.
2. It's not actually resetting topology for each cpu.

Fix this by iterating for each cpu for resetting topology.

Change-Id: I4df03fb4fbe9cb636f135de982e35173b1900ec2
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
This commit is contained in:
Srinivas Ramana 2016-06-28 12:02:28 +05:30 • committed by Kyle Yan
parent 7af744ebdf
commit 1d0f3783d5
1 changed files with 31 additions and 23 deletions
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54
arch/arm/kernel/topology.c
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@ -234,6 +234,9 @@ static int __init parse_dt_topology(void)
unsigned long capacity = 0;
int cpu = 0, ret = 0;
__cpu_capacity = kcalloc(nr_cpu_ids, sizeof(*__cpu_capacity),
GFP_NOWAIT);
cn = of_find_node_by_path("/cpus");
if (!cn) {
pr_err("No CPU information found in DT\n");
@ -260,9 +263,6 @@ static int __init parse_dt_topology(void)
if (cpu_topology[cpu].cluster_id == -1)
ret = -EINVAL;
__cpu_capacity = kcalloc(nr_cpu_ids, sizeof(*__cpu_capacity),
GFP_NOWAIT);
for_each_possible_cpu(cpu) {
const u32 *rate;
int len;
@ -456,6 +456,30 @@ static struct sched_domain_topology_level arm_topology[] = {
{ NULL, },
};
static void __init reset_cpu_topology(void)
{
unsigned int cpu;
for_each_possible_cpu(cpu) {
struct cputopo_arm *cpu_topo = &cpu_topology[cpu];
cpu_topo->thread_id = -1;
cpu_topo->core_id = -1;
cpu_topo->cluster_id = -1;
cpumask_clear(&cpu_topo->core_sibling);
cpumask_clear(&cpu_topo->thread_sibling);
}
}
static void __init reset_cpu_capacity(void)
{
unsigned int cpu;
for_each_possible_cpu(cpu)
set_capacity_scale(cpu, SCHED_CAPACITY_SCALE);
}
/*
* init_cpu_topology is called at boot when only one cpu is running
* which prevent simultaneous write access to cpu_topology array
@ -465,29 +489,13 @@ void __init init_cpu_topology(void)
unsigned int cpu;
/* init core mask and capacity */
for_each_possible_cpu(cpu) {
struct cputopo_arm *cpu_topo = &(cpu_topology[cpu]);
cpu_topo->thread_id = -1;
cpu_topo->core_id = -1;
cpu_topo->cluster_id = -1;
cpumask_clear(&cpu_topo->core_sibling);
cpumask_clear(&cpu_topo->thread_sibling);
set_capacity_scale(cpu, SCHED_CAPACITY_SCALE);
}
reset_cpu_topology();
reset_cpu_capacity();
smp_wmb();
if (parse_dt_topology()) {
struct cputopo_arm *cpu_topo = &(cpu_topology[cpu]);
cpu_topo->thread_id = -1;
cpu_topo->core_id = -1;
cpu_topo->cluster_id = -1;
cpumask_clear(&cpu_topo->core_sibling);
cpumask_clear(&cpu_topo->thread_sibling);
set_capacity_scale(cpu, SCHED_CAPACITY_SCALE);
reset_cpu_topology();
reset_cpu_capacity();
}
for_each_possible_cpu(cpu)