Re: [Buildroot] [PATCH next 1/1] package/linux-backports: bump version to 5.15.58

["Yann E. MORIN" <yann.morin.1998@free.fr>]

Thomas, Julien, All,

On 2022-08-13 22:01 +0200, Julien Olivain spake thusly:
> On 13/08/2022 12:54, Thomas Petazzoni wrote:
> >On Sat, 13 Aug 2022 11:36:27 +0200
> >Julien Olivain <ju.o@free.fr> wrote:
> >>This commit also change the minimal supported kernel version from 3.10
> >>to 4.4. See [1].
> >Could this be problematic for some of our users? Do we want to keep
> >support for an older linux-backports release to still support 3.10
> >kernels?
> >
> >I can imagine that the people who end up using linux-backports are
> >probably stuck with an old kernel for some reason, so raising the
> >minimum kernel version required to use linux-backports is probably
> >something we should do with a bit of care?

But then, one could argue that this is the same with other packages that
get requirements on newer kernel headers (and thus probably about newer
running kernel). We can't hold back forever.

The alternate solution is not great: we could add a version choice:

    config BR2_PKG_LNX_BACKPORTS_5_15_X
        bool "5.15.x (for kernels back to 4.4)"

    config BR2_PKG_LNX_BACKPORTS_5_8_X
        bool "5.8.x (for kernels back to 3.10)"

But this is not ideal... :-/

> - Trying to compile kernel v3.10.108 in qemu_aarch64_virt_defconfig
>   did not worked out-of-the-box for me (on Buildroot tag
>   2022.08-rc1, in utils/docker-run). Build fails with:
> 
>     dtc-lexer.lex.c: In function 'yylex':
>     dtc-lexer.l:46:18: error: 'yylloc' undeclared (first use in this
> function); did you mean 'yyalloc'?

Gah. This is 9b41b54be077 (linux: fix build with host-gcc 10+)...

That's because in 3.10, the dtc sub-dir still had the pre-generated
lexer and parser. And with 9b41b54be077, we remove all lines that
instanciate yylloc as a YYLTYPE:

    grep -Z -l -r -E '^YYLTYPE yylloc;$$' $(@D) \
    |xargs -0 -r $(SED) '/^YYLTYPE yylloc;$$/d'

So, this will remove it in bot the actual source and the pre-generated C
files.

So, yeah, we might even be able to build a 3.10 kernel with contemporary
Buildroot versions anyway...

We could fix that by passing REGENERATE_PARSERS=1 in LINUX_MAKE_FLAGS...
Julien, could you test that, please?

Regards,
Yann E. MORIN.

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