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[217.229.29.45]) by smtp.gmail.com with ESMTPSA id f6sm6340008wrt.87.2019.03.04.05.57.28 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 04 Mar 2019 05:57:28 -0800 (PST) Date: Mon, 4 Mar 2019 14:57:27 +0100 From: Thierry Reding To: Russell King - ARM Linux admin Subject: Re: Unstable Kernel behavior on an ARM based board Message-ID: <20190304135727.GA24676@ulmo> References: <20190302110112.GA13405@1wt.eu> <20190302112554.GB13405@1wt.eu> <20190302114652.fw46qi5opy37cakv@shell.armlinux.org.uk> MIME-Version: 1.0 In-Reply-To: <20190302114652.fw46qi5opy37cakv@shell.armlinux.org.uk> User-Agent: Mutt/1.11.3 (2019-02-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190304_055730_668306_740C5912 X-CRM114-Status: GOOD ( 21.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Embedded Engineer , Willy Tarreau , linux-arm-kernel@lists.infradead.org, Jon Hunter Content-Type: multipart/mixed; boundary="===============6362252633361147503==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============6362252633361147503== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="n8g4imXOkfNTN/H1" Content-Disposition: inline --n8g4imXOkfNTN/H1 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Mar 02, 2019 at 11:46:52AM +0000, Russell King - ARM Linux admin wr= ote: > On Sat, Mar 02, 2019 at 12:25:54PM +0100, Willy Tarreau wrote: > > On Sat, Mar 02, 2019 at 04:22:48PM +0500, Embedded Engineer wrote: > > > Thanks for response Russel and Willy, but AFIK the only available > > > Nvidia downstream kernel for our processor is 3.10.40. I tried > > > building the upstream kernel (4.9.x I guess) but it kept crashing even > > > worse so I didn't invest any more time bringing it up on our board. > >=20 > > Then if you depend on a vendor kernel, you have to deal with that vendor > > since they are the only ones who know what they secretly modified in the > > kernel to make it magically work sometimes. >=20 > I don't see why that would be necessary - mainline has support for the > Nvidia Jetson TK1 board, which means we have support for the SoC, so > mainline kernels should boot fine. We've got automated testing in place for most of the boards we support upstream. Most stable kernels are tested, as is linux-next. Jetson TK1 is among the board tested and I'm not aware of any recent regressions, other than maybe the occasional one in linux-next that usually end up impacting more than just Tegra. Adding Jon who keeps better track of the test results than I do. I should note that there are valid reasons for people wanting to stick with the downstream kernel. The simple truth is that we lack a certain number of features upstream, so if customers rely on those they don't have a lot of choice. We're actively trying to close the feature gap, but we're not quite there yet. That said, I agree with what Russell and Willy said. Using a 3.10 kernel as a base for product development is a bad idea. My suggestion is to use a recent linux-next as a baseline for testing. That's the best bet for validating that your hardware is good. Once you have established that we should have a brief chat about what exactly the requirements are that you have and then we'll have to evaluate how best to support you. 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