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Miller" cc: Greg KH , "Ahmed S. Darwish" , bigeasy@linutronix.de, linux-kernel@vger.kernel.org, mingo@redhat.com, paulmck@kernel.org, peterz@infradead.org, rostedt@goodmis.org, tglx@linutronix.de, will@kernel.org Subject: Re: [PATCH] Revert "seqlock: lockdep assert non-preemptibility on seqcount_t write" In-reply-to: References: <20200810085954.GA1591892@kroah.com> <20200810095428.2602276-1-a.darwish@linutronix.de> <20200810100502.GA2406768@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <169453.1597791077.1@turing-police> Content-Transfer-Encoding: quoted-printable Date: Tue, 18 Aug 2020 18:51:18 -0400 Message-ID: <169454.1597791078@turing-police> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 10 Aug 2020 07:10:32 -0700, Guenter Roeck said: > > ERROR: modpost: "__bad_udelay" [drivers/net/ethernet/aquantia/atlanti= c/atlantic.ko] undefined! > > = > > I don't think that is new. If anything, it is surprising that builds don= 't fail more > widely because of it. AFAICS it was introduced back in 2018 (a hot 50-ms= delay loop > really isn't such a good idea). Well...it wasn't broken in next-20200720. A bit of poking with nm, and building hw_atl/hw_atl_b0.s, it looks like the culprit is this commit: commit 8dcf2ad39fdb2d183b7bd4307c837713e3150b9a Author: Mark Starovoytov Date: Mon Jul 20 21:32:44 2020 +0300 net: atlantic: add hwmon getter for MAC temperature specifically this chunk around line 1634 of hw_atl/hw_atl_b0.c: + err =3D readx_poll_timeout_atomic(hw_atl_b0_ts_ready_and_latch_hig= h_get, + self, val, val =3D=3D 1, 10000U, 5= 00000U); And doing a 'git revert' makes the build work....