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Hermes SMTP Server) with ESMTPA ID 0ba9c517f807bbba5b63c956b00d8dd2; Tue, 28 Jun 2022 19:28:30 +0000 (UTC) Date: Tue, 28 Jun 2022 15:28:26 -0400 From: "Alex Xu (Hello71)" Subject: Re: CONFIG_ANDROID (was: rcu_sched detected expedited stalls in amdgpu after suspend) To: paulmck@kernel.org Cc: alexander.deucher@amd.com, amd-gfx@lists.freedesktop.org, Arve =?iso-8859-1?b?SGr4bm5lduVn?= , Christian Brauner , christian.koenig@amd.com, Greg Kroah-Hartman , Hridya Valsaraju , "Jason A. Donenfeld" , Joel Fernandes , linux-kernel@vger.kernel.org, Martijn Coenen , rcu@vger.kernel.org, Suren Baghdasaryan , Todd Kjos , Theodore Ts'o , uladzislau.rezki@sony.com, urezki@gmail.com, wireguard@lists.zx2c4.com, Xinhui.Pan@amd.com References: <1656357116.rhe0mufk6a.none.ref@localhost> <1656357116.rhe0mufk6a.none@localhost> <20220627204139.GL1790663@paulmck-ThinkPad-P17-Gen-1> <1656379893.q9yb069erk.none@localhost> <20220628041252.GV1790663@paulmck-ThinkPad-P17-Gen-1> <1656421946.ic03168yc3.none@localhost> <20220628185437.GA1790663@paulmck-ThinkPad-P17-Gen-1> In-Reply-To: <20220628185437.GA1790663@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Message-Id: <1656443915.mdjoauhqe0.none@localhost> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Mailer: WebService/1.1.20381 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Excerpts from Paul E. McKenney's message of June 28, 2022 2:54 pm: > All you need to do to get the previous behavior is to add something like > this to your defconfig file: >=20 > CONFIG_RCU_EXP_CPU_STALL_TIMEOUT=3D21000 >=20 > Any reason why this will not work for you? As far as I know, I do not require any particular RCU debugging features=20 intended for developers; as an individual user and distro maintainer, I=20 would like to select the option corresponding to "emit errors for=20 unexpected conditions which should be reported upstream", not "emit=20 debugging information for development purposes". Therefore, I think 0 is a suitable setting for me and most ordinary=20 (not tightly controlled) distributions. My concern is that other users=20 and distro maintainers will also have confusion about what value to set=20 and whether the warnings are important, since the help text does not say=20 anything about Android, and "make oldconfig" does not indicate that the=20 default value is different for Android. My suggestion is that the default be set to 0, and if a non-zero value=20 is appropriate for Android, that should be communicated to the Android=20 developers, not made conditional on CONFIG_ANDROID. Thanks, Alex.