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This commit abstracts the srcu_read_lock*() pointer-to-integer conversion into a new __srcu_ptr_to_ctr(). This will be used in rcutorture for testing an srcu_read_lock_fast() that returns a pointer rather than an integer. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> 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>