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    Subject[PATCH 6/8] percpu: add an indirection ptr for chunk page map access
    Date
    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>
    ---
    mm/percpu.c | 5 ++++-
    1 files changed, 4 insertions(+), 1 deletions(-)

    diff --git a/mm/percpu.c b/mm/percpu.c
    index a84cf99..5b47d9f 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;

    --
    1.6.0.2


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