linux-kernel - Re: [PATCH] Declare the file

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Message-ID: <CAPGkw+xroJmxa9i6X++un6tQFQ-3F5uMRCatzufWsdfw7cQ2LQ@mail.gmail.com>
Date:   Sun, 29 Aug 2021 20:46:16 +0200
From:   Krish Jain <krishjain02939@...il.com>
To:     Bryan Brattlof <hello@...anbrattlof.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Declare the file_operations struct as const

Keeping you updated. Small win. The "Symbol version dump
"Module.symvers" is missing. " error disappeared. Now I still don't
know why

ERROR: Kernel configuration is invalid."; \
echo >&2 "         include/generated/autoconf.h or
include/config/auto.conf are missing.";\
echo >&2 "         Run 'make oldconfig && make prepare' on kernel src
to fix it."; \


is still present.

How can I fix this?


Best Regards

On Sun, Aug 29, 2021 at 8:28 PM Krish Jain <krishjain02939@...il.com> wrote:
>
> Basically it says "you must have a prebuilt kernel available that
> contains the configuration and header files used in the build." Since
> for the staging kernel  "make oldconfig" asked me for  more
> configurations apart from my old configuration file (as it reads the
> existing .config file that was used for an old kernel and prompts the
> user for options in the current kernel source that are not found in
> the file) . So I *don't* currently have a prebuilt kernel that
> contains all the configuration in my staging kernel's .config file. So
> do I have to build the kernel once before I can just build the module
> with "make CCFLAGS=-Werror W=1 M=drivers/staging/android" ?
>
>
> Thanks again
>
> On Sun, Aug 29, 2021 at 6:56 PM Krish Jain <krishjain02939@...il.com> wrote:
> >
> > On Sun, Aug 29, 2021 at 6:49 PM Bryan Brattlof <hello@...anbrattlof.com> wrote:
> > >
> > > On this day, August 29, 2021, thus sayeth Krish Jain:
> > > > > >
> > > > > > Hi, what option do you mean?  I already ran make allmodconfig and sudo
> > > > > > make modules_install install and then make   "CCFLAGS=-Werror W=1
> > > > > > M=drivers/staging/android/" and now I do get output but one line
> > > > > > "WARNING: Symbol version dump "Module.symvers" is missing. Modules may
> > > > > > not have dependencies or modversions. You may get many unresolved
> > > > > > symbol warnings." . Then I tried "make CCFLAGS=-Werror V=1
> > > > > > M=drivers/staging/android/" and that outputted the following:
> > > > > >
> > > > >
> > > > > Most of the answers you're asking for are going to get vague responses
> > > > > (if any) on the mailing lists. The idea being (and I agree with) that
> > > > > giving out the answers will steal your opportunity to explore and learn
> > > > > the material yourself.
> > > > >
> > > > > Yes, it would be faster if we told you the answer, but ultimately, we
> > > > > would be doing a disservice to you.
> > > > >
> > > > > Besides, more times than not we (me especially) don't have the answer.
> > > > >
> > > > > With that said, I will give a (generous) hint. :)
> > > > >
> > > >
> > > > Hi. Do I have to build the kernel once before this works? Or can I
> > > > just build a module directly?
> > > >
> > >
> > > Again, do not allow others to rob you of learning how to solve these
> > > issues yourself. I *strongly* encourage you to familiarize yourself with
> > > the Kernel Build System in the Documentation.
> > >
> > >   https://www.kernel.org/doc/html/latest/kbuild/modules.html
> > >
> > > Specifically the first paragraph of "2. How to Build External Modules"
> > >
> > > It may seem like a lot for such a simple issue but it *is* worth it.
> > > ~Bryan
> > >
> >
> >
> >
> > That section says
> >
> >
> > "To build external modules, *you must have a prebuilt kernel
> > available* that contains the configuration and header files used in
> > the build. Also, the kernel must have been built with modules enabled.
> > If you are using a distribution kernel, there will be a package for
> > the kernel you are running provided by your distribution.
> >
> > An alternative is to use the “make” target “modules_prepare.” This
> > will make sure the kernel contains the information required. The
> > target exists solely as a simple way to prepare a kernel source tree
> > for building external modules.
> >
> > NOTE: “modules_prepare” will not build Module.symvers even if
> > CONFIG_MODVERSIONS is set; therefore, *a full kernel build needs to be
> > executed to make module versioning work.*"
> >
> > So I am just trying to confirm with you whether I have to first build
> > the kernel with like "make" or not? As you can imagine my hardware
> > takes *very* long to build a kernel as I did in my last attempt so I
> > am asking whether it is needed. Hope you understand.
> >
> > Best Regards