mm/slab: break up RCU readers on SLAB_TYPESAFE_BY_RCU example code

The SLAB_TYPESAFE_BY_RCU example code snippet uses a single RCU
read-side critical section for retries.
'Documentation/RCU/rculist_nulls.rst' has similar example code snippet,
and commit da82af0435 ("doc: Update and wordsmith rculist_nulls.rst")
broke it up.  Apply the change to SLAB_TYPESAFE_BY_RCU example code
snippet, too.

Signed-off-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
SeongJae Park 2023-04-17 19:04:50 +00:00 • committed by Vlastimil Babka
commit 1143c9d9d7