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Shutemov" , Gleb Fotengauer-Malinovskiy , "Dmitry V. Levin" , Michal Marek , Dmitry Torokhov , Rusty Russell , Lucas De Marchi Subject: Re: [PATCH v3] moduleparam: Save information about built-in modules in separate file Message-ID: <20190429142156.GA31567@linux-8ccs> References: <20190429090854.GU9023@dhcp129-178.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20190429090854.GU9023@dhcp129-178.brq.redhat.com> X-OS: Linux linux-8ccs 5.1.0-rc1-lp150.12.28-default+ x86_64 User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org +++ Alexey Gladkov [29/04/19 11:08 +0200]: >Problem: > >When a kernel module is compiled as a separate module, some important >information about the kernel module is available via .modinfo section of >the module. In contrast, when the kernel module is compiled into the >kernel, that information is not available. > >Information about built-in modules is necessary in the following cases: > >1. When it is necessary to find out what additional parameters can be >passed to the kernel at boot time. > >2. When you need to know which module names and their aliases are in >the kernel. This is very useful for creating an initrd image. > >Proposal: > >The proposed patch does not remove .modinfo section with module >information from the vmlinux at the build time and saves it into a >separate file after kernel linking. So, the kernel does not increase in >size and no additional information remains in it. Information is stored >in the same format as in the separate modules (null-terminated string >array). Because the .modinfo section is already exported with a separate >modules, we are not creating a new API. > >It can be easily read in the userspace: > >$ tr '\0' '\n' < kernel.builtin s/kernel.builtin/modules.builtin.modinfo/ Otherwise, for module.h and moduleparam.h: Acked-by: Jessica Yu And it would be great if Lucas can confirm if the file format and name would be OK for kmod. Thanks! Jessica