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    Subject[PATCH v5 3/9] writeback: convert variables to unsigned
    Convert two balance_dirty_pages() page counter variables (nr_reclaimable
    and nr_writeback) from 'long' to 'unsigned long'.

    These two variables are used to store results from global_page_state().
    global_page_state() returns unsigned long and carefully sums per-cpu
    counters explicitly avoiding returning a negative value.

    Signed-off-by: Greg Thelen <>
    Changelog since v4:
    - Created this patch for clarity. Previously this patch was integrated within
    the "writeback: create dirty_info structure" patch.

    mm/page-writeback.c | 6 ++++--
    1 files changed, 4 insertions(+), 2 deletions(-)

    diff --git a/mm/page-writeback.c b/mm/page-writeback.c
    index 2cb01f6..4408e54 100644
    --- a/mm/page-writeback.c
    +++ b/mm/page-writeback.c
    @@ -478,8 +478,10 @@ unsigned long bdi_dirty_limit(struct backing_dev_info *bdi, unsigned long dirty)
    static void balance_dirty_pages(struct address_space *mapping,
    unsigned long write_chunk)
    - long nr_reclaimable, bdi_nr_reclaimable;
    - long nr_writeback, bdi_nr_writeback;
    + unsigned long nr_reclaimable;
    + long bdi_nr_reclaimable;
    + unsigned long nr_writeback;
    + long bdi_nr_writeback;
    unsigned long background_thresh;
    unsigned long dirty_thresh;
    unsigned long bdi_thresh;

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      Last update: 2011-02-25 22:41    [W:0.019 / U:2.496 seconds]
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