Re: Odd build breakage in 4.9-rc7

[Jarod Wilson]

On 2016-12-02 3:11 PM, Nicolas Pitre wrote:
> On Thu, 1 Dec 2016, Paul Bolle wrote:
>
> > On Thu, 2016-12-01 at 12:42 -0500, Nicolas Pitre wrote:
> > > OK I understand what the problem is.  However most of those hunks below
> > > are definitely wrong. ;-)
> >
> > Probably. By now I've narrowed it down to just these two hunks:
>
> And they're both wrong. ;-) There is no relation between MODVERSIONS and
> TRIM_UNUSED_KSYMS.
>
> > > I'm trying to determine the best way to fix it. Stay tuned.
> >
> > Will do. I'm curious to see what a proper fix might look like.
>
> Here it is:
>
> ----- >8
> Subject: kbuild: fix building bzImage with CONFIG_TRIM_UNUSED_KSYMS enabled
>
> When building a specific target such as bzImage, modules aren't normally
> built. However if CONFIG_TRIM_UNUSED_KSYMS is enabled, no built modules
> means none of the exported symbols are used and therefore they will all
> be trimmed away from the final kernel. A subsequent "make modules" will
> fail because modpost cannot find the needed symbols for those modules in
> the kernel binary.
>
> Let's make sure modules are also built whenever CONFIG_TRIM_UNUSED_KSYMS
> is enabled and that the kernel binary is properly rebuilt accordingly.

For my previously failing case, things behave again with this patch. 
Thanks much!

Tested-by: Jarod Wilson <jarod@xxxxxxxxxx>

--
Jarod Wilson
jarod@xxxxxxxxxx