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- #if defined(CONFIG_SMP) && defined(CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK)
- #error "contiguous percpu allocation is incompatible with paged first chunk"
- #endif
- #include <linux/log2.h>
- static int pcpu_populate_chunk(struct pcpu_chunk *chunk,
- int page_start, int page_end)
- {
- return 0;
- }
- static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk,
- int page_start, int page_end)
- {
-
- }
- static struct pcpu_chunk *pcpu_create_chunk(void)
- {
- const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
- struct pcpu_chunk *chunk;
- struct page *pages;
- int i;
- chunk = pcpu_alloc_chunk();
- if (!chunk)
- return NULL;
- pages = alloc_pages(GFP_KERNEL, order_base_2(nr_pages));
- if (!pages) {
- pcpu_free_chunk(chunk);
- return NULL;
- }
- for (i = 0; i < nr_pages; i++)
- pcpu_set_page_chunk(nth_page(pages, i), chunk);
- chunk->data = pages;
- chunk->base_addr = page_address(pages) - pcpu_group_offsets[0];
- spin_lock_irq(&pcpu_lock);
- pcpu_chunk_populated(chunk, 0, nr_pages);
- spin_unlock_irq(&pcpu_lock);
- return chunk;
- }
- static void pcpu_destroy_chunk(struct pcpu_chunk *chunk)
- {
- const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
- if (chunk && chunk->data)
- __free_pages(chunk->data, order_base_2(nr_pages));
- pcpu_free_chunk(chunk);
- }
- static struct page *pcpu_addr_to_page(void *addr)
- {
- return virt_to_page(addr);
- }
- static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai)
- {
- size_t nr_pages, alloc_pages;
-
- if (ai->nr_groups != 1) {
- pr_crit("can't handle more than one group\n");
- return -EINVAL;
- }
- nr_pages = (ai->groups[0].nr_units * ai->unit_size) >> PAGE_SHIFT;
- alloc_pages = roundup_pow_of_two(nr_pages);
- if (alloc_pages > nr_pages)
- pr_warn("wasting %zu pages per chunk\n",
- alloc_pages - nr_pages);
- return 0;
- }
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