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[ Upstream commit e6c86c513f440bec5f1046539c7e3c6c653842da ] As an accident of implementation, an RCU Tasks Trace grace period also acts as an RCU grace period. However, this could change at any time. This commit therefore creates an rcu_trace_implies_rcu_gp() that currently returns true to codify this accident. Code relying on this accident must call this function to verify that this accident is still happening. Reported-by: Hou Tao <houtao@huaweicloud.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Martin KaFai Lau <martin.lau@linux.dev> Link: https://lore.kernel.org/r/20221014113946.965131-2-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> Stable-dep-of: 876673364161 ("bpf: Defer the free of inner map when necessary") Signed-off-by: Sasha Levin <sashal@kernel.org> (cherry picked from commit 10108826191ab30388e8ae9d54505a628f78a7ec) Signed-off-by: Robert Kolchmeyer <rkolchmeyer@google.com> Signed-off-by: Sasha Levin <sashal@kernel.org>