diff options
Diffstat (limited to 'mm/percpu.c')
| -rw-r--r-- | mm/percpu.c | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/mm/percpu.c b/mm/percpu.c index bf80e55dbed7..93b5a7c96a7e 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -116,9 +116,9 @@ static int pcpu_atom_size __read_mostly; static int pcpu_nr_slots __read_mostly; static size_t pcpu_chunk_struct_size __read_mostly; -/* cpus with the lowest and highest unit numbers */ -static unsigned int pcpu_first_unit_cpu __read_mostly; -static unsigned int pcpu_last_unit_cpu __read_mostly; +/* cpus with the lowest and highest unit addresses */ +static unsigned int pcpu_low_unit_cpu __read_mostly; +static unsigned int pcpu_high_unit_cpu __read_mostly; /* the address of the first chunk which starts with the kernel static area */ void *pcpu_base_addr __read_mostly; @@ -984,19 +984,19 @@ phys_addr_t per_cpu_ptr_to_phys(void *addr) { void __percpu *base = __addr_to_pcpu_ptr(pcpu_base_addr); bool in_first_chunk = false; - unsigned long first_start, first_end; + unsigned long first_low, first_high; unsigned int cpu; /* - * The following test on first_start/end isn't strictly + * The following test on unit_low/high isn't strictly * necessary but will speed up lookups of addresses which * aren't in the first chunk. */ - first_start = pcpu_chunk_addr(pcpu_first_chunk, pcpu_first_unit_cpu, 0); - first_end = pcpu_chunk_addr(pcpu_first_chunk, pcpu_last_unit_cpu, - pcpu_unit_pages); - if ((unsigned long)addr >= first_start && - (unsigned long)addr < first_end) { + first_low = pcpu_chunk_addr(pcpu_first_chunk, pcpu_low_unit_cpu, 0); + first_high = pcpu_chunk_addr(pcpu_first_chunk, pcpu_high_unit_cpu, + pcpu_unit_pages); + if ((unsigned long)addr >= first_low && + (unsigned long)addr < first_high) { for_each_possible_cpu(cpu) { void *start = per_cpu_ptr(base, cpu); @@ -1233,7 +1233,9 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, for (cpu = 0; cpu < nr_cpu_ids; cpu++) unit_map[cpu] = UINT_MAX; - pcpu_first_unit_cpu = NR_CPUS; + + pcpu_low_unit_cpu = NR_CPUS; + pcpu_high_unit_cpu = NR_CPUS; for (group = 0, unit = 0; group < ai->nr_groups; group++, unit += i) { const struct pcpu_group_info *gi = &ai->groups[group]; @@ -1253,9 +1255,13 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, unit_map[cpu] = unit + i; unit_off[cpu] = gi->base_offset + i * ai->unit_size; - if (pcpu_first_unit_cpu == NR_CPUS) - pcpu_first_unit_cpu = cpu; - pcpu_last_unit_cpu = cpu; + /* determine low/high unit_cpu */ + if (pcpu_low_unit_cpu == NR_CPUS || + unit_off[cpu] < unit_off[pcpu_low_unit_cpu]) + pcpu_low_unit_cpu = cpu; + if (pcpu_high_unit_cpu == NR_CPUS || + unit_off[cpu] > unit_off[pcpu_high_unit_cpu]) + pcpu_high_unit_cpu = cpu; } } pcpu_nr_units = unit; |