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s390/topology: honour nr_cpu_ids when adding CPUs 

[ Upstream commit a33239be2d ]

When SMT thread CPUs are added to CPU masks the nr_cpu_ids
limit is not checked and could be exceeded. This leads to
a warning for example if CONFIG_DEBUG_PER_CPU_MAPS is set
and the command line parameter nr_cpus is set to 1.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexander Gordeev 2023-05-04 16:21:48 +02:00 committed by Greg Kroah-Hartman
parent 26cfe2faa8
commit 905b247f6e
1 changed files with 17 additions and 15 deletions
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32
arch/s390/kernel/topology.c
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@ -95,7 +95,7 @@ static void cpu_group_map(cpumask_t *dst, struct mask_info *info, unsigned int c
static void cpu_thread_map(cpumask_t *dst, unsigned int cpu)
{
static cpumask_t mask;
int i;
unsigned int max_cpu;
cpumask_clear(&mask);
if (!cpumask_test_cpu(cpu, &cpu_setup_mask))
@ -104,9 +104,10 @@ static void cpu_thread_map(cpumask_t *dst, unsigned int cpu)
if (topology_mode != TOPOLOGY_MODE_HW)
goto out;
cpu -= cpu % (smp_cpu_mtid + 1);
for (i = 0; i <= smp_cpu_mtid; i++) {
if (cpumask_test_cpu(cpu + i, &cpu_setup_mask))
cpumask_set_cpu(cpu + i, &mask);
max_cpu = min(cpu + smp_cpu_mtid, nr_cpu_ids - 1);
for (; cpu <= max_cpu; cpu++) {
if (cpumask_test_cpu(cpu, &cpu_setup_mask))
cpumask_set_cpu(cpu, &mask);
}
out:
cpumask_copy(dst, &mask);
@ -123,25 +124,26 @@ static void add_cpus_to_mask(struct topology_core *tl_core,
unsigned int core;
for_each_set_bit(core, &tl_core->mask, TOPOLOGY_CORE_BITS) {
unsigned int rcore;
int lcpu, i;
unsigned int max_cpu, rcore;
int cpu;
rcore = TOPOLOGY_CORE_BITS - 1 - core + tl_core->origin;
lcpu = smp_find_processor_id(rcore << smp_cpu_mt_shift);
if (lcpu < 0)
cpu = smp_find_processor_id(rcore << smp_cpu_mt_shift);
if (cpu < 0)
continue;
for (i = 0; i <= smp_cpu_mtid; i++) {
topo = &cpu_topology[lcpu + i];
max_cpu = min(cpu + smp_cpu_mtid, nr_cpu_ids - 1);
for (; cpu <= max_cpu; cpu++) {
topo = &cpu_topology[cpu];
topo->drawer_id = drawer->id;
topo->book_id = book->id;
topo->socket_id = socket->id;
topo->core_id = rcore;
topo->thread_id = lcpu + i;
topo->thread_id = cpu;
topo->dedicated = tl_core->d;
cpumask_set_cpu(lcpu + i, &drawer->mask);
cpumask_set_cpu(lcpu + i, &book->mask);
cpumask_set_cpu(lcpu + i, &socket->mask);
smp_cpu_set_polarization(lcpu + i, tl_core->pp);
cpumask_set_cpu(cpu, &drawer->mask);
cpumask_set_cpu(cpu, &book->mask);
cpumask_set_cpu(cpu, &socket->mask);
smp_cpu_set_polarization(cpu, tl_core->pp);
}
}
}