radix_tree_lookup_slot() and radix_tree_replace_slot() API expect the slot returned and looked up to be marked with __rcu. Otherwise sparse warnings are generated: drivers/md/raid5-cache.c:2939:23: warning: incorrect type in assignment (different address spaces) drivers/md/raid5-cache.c:2939:23: expected void **pslot drivers/md/raid5-cache.c:2939:23: got void [noderef] __rcu ** Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> --- drivers/md/raid5-cache.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c index d6461d4814ab..15cab59adfcf 100644 --- a/drivers/md/raid5-cache.c +++ b/drivers/md/raid5-cache.c @@ -2637,7 +2637,7 @@ int r5c_try_caching_write(struct r5conf *conf, int i; struct r5dev *dev; int to_cache = 0; - void **pslot; + void __rcu **pslot; sector_t tree_index; int ret; uintptr_t refcount; @@ -2804,7 +2804,7 @@ void r5c_finish_stripe_write_out(struct r5conf *conf, int i; int do_wakeup = 0; sector_t tree_index; - void **pslot; + void __rcu **pslot; uintptr_t refcount; if (!log || !test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags)) -- 2.30.2
