tree b7076a00273891c180c0d0a4a81552322d2a7837
parent 4528474c4c4c9bf18f92c42691275b929b24b65d
author Paul E. McKenney <paulmck@kernel.org> 1665747583 +0800
committer COS Cherry Picker <cloud-image-release@prod.google.com> 1710290067 -0700

rcu-tasks: Provide rcu_trace_implies_rcu_gp()

[ 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.

BUG=b/326650130
TEST=presubmit
RELEASE_NOTE=None

cos-patch: security-high
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>
Change-Id: Icd6d53e5839035ac839496c65e76794023885325
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/66410
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Oleksandr Tymoshenko <ovt@google.com>