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

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Message-ID: <20210829164921.u5ntqk5jz2v3hlgr@h510>
Date:   Sun, 29 Aug 2021 16:49:35 +0000
From:   Bryan Brattlof <hello@...anbrattlof.com>
To:     Krish Jain <krishjain02939@...il.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

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