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    Subject[PATCH 3.18 127/144] fs/fat/fatent.c: add cond_resched() to fat_count_free_clusters()
    Date
    3.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    [ Upstream commit ac081c3be3fae6d0cc3e1862507fca3862d30b67 ]

    On non-preempt kernels this loop can take a long time (more than 50 ticks)
    processing through entries.

    Link: http://lkml.kernel.org/r/20181010172623.57033-1-khazhy@google.com
    Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
    Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
    Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    fs/fat/fatent.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
    index 08b3db146888..83550ac31f49 100644
    --- a/fs/fat/fatent.c
    +++ b/fs/fat/fatent.c
    @@ -684,6 +684,7 @@ int fat_count_free_clusters(struct super_block *sb)
    if (ops->ent_get(&fatent) == FAT_ENT_FREE)
    free++;
    } while (fat_ent_next(sbi, &fatent));
    + cond_resched();
    }
    sbi->free_clusters = free;
    sbi->free_clus_valid = 1;
    --
    2.17.1


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