Re: [Outreachy kernel] Warning about ENOSYS

[Debleena Sen <idebleenasen@gmail.com>]

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On Tue, 5 Mar 2019, 23:46 Julia Lawall, <julia.lawall@lip6.fr> wrote:

>
>
> On Tue, 5 Mar 2019, Debleena Sen wrote:
>
> > I came across the following warning in
> > git/kernels/staging/drivers/staging/vboxvideo/vbox_prime.c
> > WARNING: ENOSYS means 'invalid syscall nr' and nothing else
> > For the following line:
> >                  return ERR_PTR(-ENOSYS);
> >
> > How should I go about fixing this issue?
>
> One would need to know more about the context.  This return is indicating
> that some error occurred.  This is probably under some condition, that
> checks whether there is a problem.  The indication of a problem probably
> involves some variables that hold the results of some function calls, that
> may be producing inappropriate results.  All of that has to be taken into
> account.
>
> A typical example is:
>
> x = kzalloc(sizeof(struct foo), GFP_KERNEL);
> if (!x) {
>   ...
>   return -ENOMEM;
> }
>
> Here to see that -ENOMEM is the appropriate return value, you actally have
> to look back and see that what failed is the call to kzalloc (a kernel
> memory allocator).
>
> julia
>
> >
> > Thanks,
> > Debleena
> >
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Thanks for the explanation. I'll try to find the problem with the code and
fix it

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