diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/percpu.c | 95 |
1 files changed, 47 insertions, 48 deletions
diff --git a/mm/percpu.c b/mm/percpu.c index 99f7fa68272..653b02c4020 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -117,8 +117,8 @@ static unsigned int pcpu_last_unit_cpu __read_mostly; void *pcpu_base_addr __read_mostly; EXPORT_SYMBOL_GPL(pcpu_base_addr); -/* cpu -> unit map */ -const int *pcpu_unit_map __read_mostly; +static const int *pcpu_unit_map __read_mostly; /* cpu -> unit */ +const unsigned long *pcpu_unit_offsets __read_mostly; /* cpu -> unit offset */ /* * The first chunk which always exists. Note that unlike other @@ -196,8 +196,8 @@ static int pcpu_page_idx(unsigned int cpu, int page_idx) static unsigned long pcpu_chunk_addr(struct pcpu_chunk *chunk, unsigned int cpu, int page_idx) { - return (unsigned long)chunk->vm->addr + - (pcpu_page_idx(cpu, page_idx) << PAGE_SHIFT); + return (unsigned long)chunk->vm->addr + pcpu_unit_offsets[cpu] + + (page_idx << PAGE_SHIFT); } static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk, @@ -341,7 +341,7 @@ static struct pcpu_chunk *pcpu_chunk_addr_search(void *addr) * space. Note that any possible cpu id can be used here, so * there's no need to worry about preemption or cpu hotplug. */ - addr += pcpu_unit_map[smp_processor_id()] * pcpu_unit_size; + addr += pcpu_unit_offsets[smp_processor_id()]; return pcpu_get_page_chunk(vmalloc_to_page(addr)); } @@ -1560,17 +1560,17 @@ static void pcpu_dump_alloc_info(const char *lvl, * and available for dynamic allocation like any other chunks. * * RETURNS: - * The determined pcpu_unit_size which can be used to initialize - * percpu access. + * 0 on success, -errno on failure. */ -size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, - void *base_addr) +int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, + void *base_addr) { static struct vm_struct first_vm; static int smap[2], dmap[2]; size_t dyn_size = ai->dyn_size; size_t size_sum = ai->static_size + ai->reserved_size + dyn_size; struct pcpu_chunk *schunk, *dchunk = NULL; + unsigned long *unit_off; unsigned int cpu; int *unit_map; int group, unit, i; @@ -1587,8 +1587,9 @@ size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, pcpu_dump_alloc_info(KERN_DEBUG, ai); - /* determine number of units and verify and initialize pcpu_unit_map */ + /* determine number of units and initialize unit_map and base */ unit_map = alloc_bootmem(nr_cpu_ids * sizeof(unit_map[0])); + unit_off = alloc_bootmem(nr_cpu_ids * sizeof(unit_off[0])); for (cpu = 0; cpu < nr_cpu_ids; cpu++) unit_map[cpu] = NR_CPUS; @@ -1606,6 +1607,8 @@ size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, BUG_ON(unit_map[cpu] != NR_CPUS); 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; } @@ -1617,6 +1620,7 @@ size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, BUG_ON(unit_map[cpu] == NR_CPUS); pcpu_unit_map = unit_map; + pcpu_unit_offsets = unit_off; /* determine basic parameters */ pcpu_unit_pages = ai->unit_size >> PAGE_SHIFT; @@ -1688,7 +1692,7 @@ size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, /* we're done */ pcpu_base_addr = schunk->vm->addr; - return pcpu_unit_size; + return 0; } const char *pcpu_fc_names[PCPU_FC_NR] __initdata = { @@ -1748,16 +1752,15 @@ early_param("percpu_alloc", percpu_alloc_setup); * size, the leftover is returned to the bootmem allocator. * * RETURNS: - * The determined pcpu_unit_size which can be used to initialize - * percpu access on success, -errno on failure. + * 0 on success, -errno on failure. */ -ssize_t __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size) +int __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size) { struct pcpu_alloc_info *ai; size_t size_sum, chunk_size; void *base; int unit; - ssize_t ret; + int rc; ai = pcpu_build_alloc_info(reserved_size, dyn_size, PAGE_SIZE, NULL); if (IS_ERR(ai)) @@ -1773,7 +1776,7 @@ ssize_t __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size) if (!base) { pr_warning("PERCPU: failed to allocate %zu bytes for " "embedding\n", chunk_size); - ret = -ENOMEM; + rc = -ENOMEM; goto out_free_ai; } @@ -1790,10 +1793,10 @@ ssize_t __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size) PFN_DOWN(size_sum), base, ai->static_size, ai->reserved_size, ai->dyn_size, ai->unit_size); - ret = pcpu_setup_first_chunk(ai, base); + rc = pcpu_setup_first_chunk(ai, base); out_free_ai: pcpu_free_alloc_info(ai); - return ret; + return rc; } #endif /* CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK || !CONFIG_HAVE_SETUP_PER_CPU_AREA */ @@ -1813,13 +1816,12 @@ out_free_ai: * page-by-page into vmalloc area. * * RETURNS: - * The determined pcpu_unit_size which can be used to initialize - * percpu access on success, -errno on failure. + * 0 on success, -errno on failure. */ -ssize_t __init pcpu_page_first_chunk(size_t reserved_size, - pcpu_fc_alloc_fn_t alloc_fn, - pcpu_fc_free_fn_t free_fn, - pcpu_fc_populate_pte_fn_t populate_pte_fn) +int __init pcpu_page_first_chunk(size_t reserved_size, + pcpu_fc_alloc_fn_t alloc_fn, + pcpu_fc_free_fn_t free_fn, + pcpu_fc_populate_pte_fn_t populate_pte_fn) { static struct vm_struct vm; struct pcpu_alloc_info *ai; @@ -1827,8 +1829,7 @@ ssize_t __init pcpu_page_first_chunk(size_t reserved_size, int unit_pages; size_t pages_size; struct page **pages; - int unit, i, j; - ssize_t ret; + int unit, i, j, rc; snprintf(psize_str, sizeof(psize_str), "%luK", PAGE_SIZE >> 10); @@ -1874,10 +1875,10 @@ ssize_t __init pcpu_page_first_chunk(size_t reserved_size, populate_pte_fn(unit_addr + (i << PAGE_SHIFT)); /* pte already populated, the following shouldn't fail */ - ret = __pcpu_map_pages(unit_addr, &pages[unit * unit_pages], - unit_pages); - if (ret < 0) - panic("failed to map percpu area, err=%zd\n", ret); + rc = __pcpu_map_pages(unit_addr, &pages[unit * unit_pages], + unit_pages); + if (rc < 0) + panic("failed to map percpu area, err=%d\n", rc); /* * FIXME: Archs with virtual cache should flush local @@ -1896,17 +1897,17 @@ ssize_t __init pcpu_page_first_chunk(size_t reserved_size, unit_pages, psize_str, vm.addr, ai->static_size, ai->reserved_size, ai->dyn_size); - ret = pcpu_setup_first_chunk(ai, vm.addr); + rc = pcpu_setup_first_chunk(ai, vm.addr); goto out_free_ar; enomem: while (--j >= 0) free_fn(page_address(pages[j]), PAGE_SIZE); - ret = -ENOMEM; + rc = -ENOMEM; out_free_ar: free_bootmem(__pa(pages), pages_size); pcpu_free_alloc_info(ai); - return ret; + return rc; } #endif /* CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK */ @@ -1977,20 +1978,18 @@ static int __init pcpul_cpu_to_unit(int cpu, const struct pcpu_alloc_info *ai) * pcpu_lpage_remapped(). * * RETURNS: - * The determined pcpu_unit_size which can be used to initialize - * percpu access on success, -errno on failure. + * 0 on success, -errno on failure. */ -ssize_t __init pcpu_lpage_first_chunk(const struct pcpu_alloc_info *ai, - pcpu_fc_alloc_fn_t alloc_fn, - pcpu_fc_free_fn_t free_fn, - pcpu_fc_map_fn_t map_fn) +int __init pcpu_lpage_first_chunk(const struct pcpu_alloc_info *ai, + pcpu_fc_alloc_fn_t alloc_fn, + pcpu_fc_free_fn_t free_fn, + pcpu_fc_map_fn_t map_fn) { static struct vm_struct vm; const size_t lpage_size = ai->atom_size; size_t chunk_size, map_size; unsigned int cpu; - ssize_t ret; - int i, j, unit, nr_units; + int i, j, unit, nr_units, rc; nr_units = 0; for (i = 0; i < ai->nr_groups; i++) @@ -2070,7 +2069,7 @@ ssize_t __init pcpu_lpage_first_chunk(const struct pcpu_alloc_info *ai, vm.addr, ai->static_size, ai->reserved_size, ai->dyn_size, ai->unit_size); - ret = pcpu_setup_first_chunk(ai, vm.addr); + rc = pcpu_setup_first_chunk(ai, vm.addr); /* * Sort pcpul_map array for pcpu_lpage_remapped(). Unmapped @@ -2094,7 +2093,7 @@ ssize_t __init pcpu_lpage_first_chunk(const struct pcpu_alloc_info *ai, while (pcpul_nr_lpages && !pcpul_map[pcpul_nr_lpages - 1].ptr) pcpul_nr_lpages--; - return ret; + return rc; enomem: for (i = 0; i < pcpul_nr_lpages; i++) @@ -2166,21 +2165,21 @@ EXPORT_SYMBOL(__per_cpu_offset); void __init setup_per_cpu_areas(void) { - ssize_t unit_size; unsigned long delta; unsigned int cpu; + int rc; /* * Always reserve area for module percpu variables. That's * what the legacy allocator did. */ - unit_size = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, - PERCPU_DYNAMIC_RESERVE); - if (unit_size < 0) + rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, + PERCPU_DYNAMIC_RESERVE); + if (rc < 0) panic("Failed to initialized percpu areas."); delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; for_each_possible_cpu(cpu) - __per_cpu_offset[cpu] = delta + cpu * unit_size; + __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu]; } #endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */ |