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Given that SRCU allows its read-side critical sections are not just preemptible, but also allow general blocking, there is not much reason to restrict Tiny SRCU to non-preemptible kernels. This commit therefore removes Tiny SRCU dependencies on non-preemptibility, primarily surrounding its interaction with rcutorture and early boot. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Ankur Arora <ankur.a.arora@oracle.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Andrii Nakryiko <andrii@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Kent Overstreet <kent.overstreet@linux.dev> Cc: <bpf@vger.kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>