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| author | Tejun Heo <tj@kernel.org> | 2009-03-06 14:33:59 +0900 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2009-03-06 14:33:59 +0900 |
| commit | 3e24aa58907c62bc79d1094e941a374568f62522 (patch) | |
| tree | 1398a21daab0d20a32d7dd04bb8ecadae2e0df82 | |
| parent | 9a4f8a878b68d5a5d9ee60908a52cf6a55e1b823 (diff) | |
| download | lwn-3e24aa58907c62bc79d1094e941a374568f62522.tar.gz lwn-3e24aa58907c62bc79d1094e941a374568f62522.zip | |
percpu: add an indirection ptr for chunk page map access
Impact: allow sharing page map, no functional difference yet
Make chunk->page access indirect by adding a pointer and renaming the
actual array to page_ar. This will be used by future changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
| -rw-r--r-- | mm/percpu.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/percpu.c b/mm/percpu.c index a84cf9977faf..5b47d9fe65f5 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -80,7 +80,8 @@ struct pcpu_chunk { int map_alloc; /* # of map entries allocated */ int *map; /* allocation map */ bool immutable; /* no [de]population allowed */ - struct page *page[]; /* #cpus * UNIT_PAGES */ + struct page **page; /* points to page array */ + struct page *page_ar[]; /* #cpus * UNIT_PAGES */ }; static int pcpu_unit_pages __read_mostly; @@ -696,6 +697,7 @@ static struct pcpu_chunk *alloc_pcpu_chunk(void) PCPU_DFL_MAP_ALLOC * sizeof(chunk->map[0])); chunk->map_alloc = PCPU_DFL_MAP_ALLOC; chunk->map[chunk->map_used++] = pcpu_unit_size; + chunk->page = chunk->page_ar; chunk->vm = get_vm_area(pcpu_chunk_size, GFP_KERNEL); if (!chunk->vm) { @@ -918,6 +920,7 @@ size_t __init pcpu_setup_first_chunk(pcpu_get_page_fn_t get_page_fn, schunk->vm = &first_vm; schunk->map = smap; schunk->map_alloc = ARRAY_SIZE(smap); + schunk->page = schunk->page_ar; schunk->free_size = dyn_size; schunk->contig_hint = schunk->free_size; |