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s390/topology: convert cpu_topology array to per cpu variable

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Convert the per cpu topology cpu masks to a per cpu variable.
At least for machines which do have less possible cpus than NR_CPUS this can
save a bit of memory (z/VM: max 64 vs 512 for performance_defconfig).

This reduces the kernel image size by 100k.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2015-02-04 14:48:25 +01:00 committed by Martin Schwidefsky
parent d05d15da18
commit da0c636ea7
2 changed files with 25 additions and 25 deletions
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16
arch/s390/include/asm/topology.h
View file

@ -18,15 +18,15 @@ struct cpu_topology_s390 {
cpumask_t book_mask;
};
extern struct cpu_topology_s390 cpu_topology[NR_CPUS];
DECLARE_PER_CPU(struct cpu_topology_s390, cpu_topology);
#define topology_physical_package_id(cpu) (cpu_topology[cpu].socket_id)
#define topology_thread_id(cpu) (cpu_topology[cpu].thread_id)
#define topology_thread_cpumask(cpu) (&cpu_topology[cpu].thread_mask)
#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_mask)
#define topology_book_id(cpu) (cpu_topology[cpu].book_id)
#define topology_book_cpumask(cpu) (&cpu_topology[cpu].book_mask)
#define topology_physical_package_id(cpu) (per_cpu(cpu_topology, cpu).socket_id)
#define topology_thread_id(cpu) (per_cpu(cpu_topology, cpu).thread_id)
#define topology_thread_cpumask(cpu) (&per_cpu(cpu_topology, cpu).thread_mask)
#define topology_core_id(cpu) (per_cpu(cpu_topology, cpu).core_id)
#define topology_core_cpumask(cpu) (&per_cpu(cpu_topology, cpu).core_mask)
#define topology_book_id(cpu) (per_cpu(cpu_topology, cpu).book_id)
#define topology_book_cpumask(cpu) (&per_cpu(cpu_topology, cpu).book_mask)
#define mc_capable() 1

34
arch/s390/kernel/topology.c
View file

@ -42,8 +42,8 @@ static DEFINE_SPINLOCK(topology_lock);
static struct mask_info socket_info;
static struct mask_info book_info;
struct cpu_topology_s390 cpu_topology[NR_CPUS];
EXPORT_SYMBOL_GPL(cpu_topology);
DEFINE_PER_CPU(struct cpu_topology_s390, cpu_topology);
EXPORT_PER_CPU_SYMBOL_GPL(cpu_topology);
static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
{
@ -90,15 +90,15 @@ static struct mask_info *add_cpus_to_mask(struct topology_core *tl_core,
if (lcpu < 0)
continue;
for (i = 0; i <= smp_cpu_mtid; i++) {
cpu_topology[lcpu + i].book_id = book->id;
cpu_topology[lcpu + i].core_id = rcore;
cpu_topology[lcpu + i].thread_id = lcpu + i;
per_cpu(cpu_topology, lcpu + i).book_id = book->id;
per_cpu(cpu_topology, lcpu + i).core_id = rcore;
per_cpu(cpu_topology, lcpu + i).thread_id = lcpu + i;
cpumask_set_cpu(lcpu + i, &book->mask);
cpumask_set_cpu(lcpu + i, &socket->mask);
if (one_socket_per_cpu)
cpu_topology[lcpu + i].socket_id = rcore;
per_cpu(cpu_topology, lcpu + i).socket_id = rcore;
else
cpu_topology[lcpu + i].socket_id = socket->id;
per_cpu(cpu_topology, lcpu + i).socket_id = socket->id;
smp_cpu_set_polarization(lcpu + i, tl_core->pp);
}
if (one_socket_per_cpu)
@ -249,14 +249,14 @@ static void update_cpu_masks(void)
spin_lock_irqsave(&topology_lock, flags);
for_each_possible_cpu(cpu) {
cpu_topology[cpu].thread_mask = cpu_thread_map(cpu);
cpu_topology[cpu].core_mask = cpu_group_map(&socket_info, cpu);
cpu_topology[cpu].book_mask = cpu_group_map(&book_info, cpu);
per_cpu(cpu_topology, cpu).thread_mask = cpu_thread_map(cpu);
per_cpu(cpu_topology, cpu).core_mask = cpu_group_map(&socket_info, cpu);
per_cpu(cpu_topology, cpu).book_mask = cpu_group_map(&book_info, cpu);
if (!MACHINE_HAS_TOPOLOGY) {
cpu_topology[cpu].thread_id = cpu;
cpu_topology[cpu].core_id = cpu;
cpu_topology[cpu].socket_id = cpu;
cpu_topology[cpu].book_id = cpu;
per_cpu(cpu_topology, cpu).thread_id = cpu;
per_cpu(cpu_topology, cpu).core_id = cpu;
per_cpu(cpu_topology, cpu).socket_id = cpu;
per_cpu(cpu_topology, cpu).book_id = cpu;
}
}
spin_unlock_irqrestore(&topology_lock, flags);
@ -423,18 +423,18 @@ int topology_cpu_init(struct cpu *cpu)
const struct cpumask *cpu_thread_mask(int cpu)
{
return &cpu_topology[cpu].thread_mask;
return &per_cpu(cpu_topology, cpu).thread_mask;
}
const struct cpumask *cpu_coregroup_mask(int cpu)
{
return &cpu_topology[cpu].core_mask;
return &per_cpu(cpu_topology, cpu).core_mask;
}
static const struct cpumask *cpu_book_mask(int cpu)
{
return &cpu_topology[cpu].book_mask;
return &per_cpu(cpu_topology, cpu).book_mask;
}
static int __init early_parse_topology(char *p)