Hi, Minchan,
Minchan Kim <minchan@xxxxxxxxxx> writes:
> We changed swap_cluster_info lock from bit_spin_lock to spinlock
> so we need to initialize the spinlock before the using. Otherwise,
> lockdep is broken.
>
> Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
> Cc: Huang Ying <ying.huang@xxxxxxxxx>
> Cc: Hugh Dickins <hughd@xxxxxxxxxx>
> Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Good catch! Thanks a lot for your fixing!
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Best Regards,
Huang, Ying
> ---
> Andrew,
> I think it's no worth to add this patch to separate commit.
> If you don't mind, it's okay to fold this patch to mm-swap-add-cluster-lock-v5.
> Thanks.
>
> mm/swapfile.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 1fc1824140e1..5ac2cb40dbd3 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -2762,6 +2762,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
>
> if (p->bdev && blk_queue_nonrot(bdev_get_queue(p->bdev))) {
> int cpu;
> + unsigned long ci, nr_cluster;
>
> p->flags |= SWP_SOLIDSTATE;
> /*
> @@ -2769,13 +2770,17 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
> * SSD
> */
> p->cluster_next = 1 + (prandom_u32() % p->highest_bit);
> + nr_cluster = DIV_ROUND_UP(maxpages, SWAPFILE_CLUSTER);
>
> - cluster_info = vzalloc(DIV_ROUND_UP(maxpages,
> - SWAPFILE_CLUSTER) * sizeof(*cluster_info));
> + cluster_info = vzalloc(nr_cluster * sizeof(*cluster_info));
> if (!cluster_info) {
> error = -ENOMEM;
> goto bad_swap;
> }
> +
> + for (ci = 0; ci < nr_cluster; ci++)
> + spin_lock_init(&((cluster_info + ci)->lock));
> +
> p->percpu_cluster = alloc_percpu(struct percpu_cluster);
> if (!p->percpu_cluster) {
> error = -ENOMEM;
--
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