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This commit switches from a direct test of SRCU_READ_FLAVOR_LITE to a new SRCU_READ_FLAVOR_SLOWGP macro to check for substituting synchronize_rcu() for smp_mb() in SRCU grace periods. Right now, SRCU_READ_FLAVOR_SLOWGP is exactly SRCU_READ_FLAVOR_LITE, but the addition of the _fast() flavor of SRCU will change that. 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>