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[80.5.128.40]) by smtp.gmail.com with ESMTPSA id d9sm20925433wrs.26.2020.12.08.07.01.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Dec 2020 07:01:39 -0800 (PST) Subject: Re: pull-request: wireless-drivers-next-2020-12-03 To: Jakub Kicinski , Brian Norris Cc: Kalle Valo , netdev@vger.kernel.org, linux-wireless References: <20201203185732.9CFA5C433ED@smtp.codeaurora.org> <20201204111715.04d5b198@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com> <87tusxgar5.fsf@codeaurora.org> <20201207121029.77d48f2c@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com> From: Edward Cree Message-ID: Date: Tue, 8 Dec 2020 15:01:39 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <20201207121029.77d48f2c@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 07/12/2020 20:10, Jakub Kicinski wrote: > On Mon, 7 Dec 2020 11:35:53 -0800 Brian Norris wrote: >> Is there some reference for this rule (e.g., dictate from on high; or >> some explanation of reasons)? Or limitations on it? > > TBH its one of those "widely accepted truth" in networking which was > probably discussed before I started compiling kernels so I don't know > the full background. My understanding is that it's because users can have them in their modprobe.conf, which causes breakage if an update removes the param. I think the module insert fails if there are unrecognised parameters there. >> this sounds like one could never drop a module parameter, or remove >> obsolete features. Not far from the truth. If you stop the network from coming up on boot you can really ruin a sysadmin's day :-/ But usually you can remove the feature, and leave the modparam not connected to anything, except maybe a deprecation warning printk if it's set to something other than the default. -ed