On 2019-11-12 11:09:51 [-0500], Mikulas Patocka wrote:
> ===================================================================
> --- linux-2.6.orig/drivers/md/dm-snap.c 2019-11-12 16:44:36.000000000 +0100
> +++ linux-2.6/drivers/md/dm-snap.c 2019-11-12 17:01:46.000000000 +0100
…
> static void dm_exception_table_lock(struct dm_exception_table_lock *lock)
> {
> +#ifndef CONFIG_PREEMPT_RT_BASE
> hlist_bl_lock(lock->complete_slot);
> hlist_bl_lock(lock->pending_slot);
> +#else
> + spin_lock(lock->lock);
if you also set the lowest bit for complete_slot + pending_slot then
patch 2 of this mini series wouldn't be required. That means we could
keep the debug code on -RT. Or am I missing something?
> +#endif
> }
Sebastian
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