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    Subject[PATCH 5.7 264/265] dm writecache: add cond_resched to loop in persistent_memory_claim()
    Date
    From: Mikulas Patocka <mpatocka@redhat.com>

    commit d35bd764e6899a7bea71958f08d16cea5bfa1919 upstream.

    Add cond_resched() to a loop that fills in the mapper memory area
    because the loop can be executed many times.

    Fixes: 48debafe4f2fe ("dm: add writecache target")
    Cc: stable@vger.kernel.org
    Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
    Signed-off-by: Mike Snitzer <snitzer@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/md/dm-writecache.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
    index 856b3515654ff..5cc94f57421ca 100644
    --- a/drivers/md/dm-writecache.c
    +++ b/drivers/md/dm-writecache.c
    @@ -286,6 +286,8 @@ static int persistent_memory_claim(struct dm_writecache *wc)
    while (daa-- && i < p) {
    pages[i++] = pfn_t_to_page(pfn);
    pfn.val++;
    + if (!(i & 15))
    + cond_resched();
    }
    } while (i < p);
    wc->memory_map = vmap(pages, p, VM_MAP, PAGE_KERNEL);
    --
    2.25.1
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