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15.20.9611.008; Thu, 12 Feb 2026 06:48:13 +0000 Content-Type: multipart/alternative; boundary="------------1SBFdkYxyCiPLym0l0KfV5eo" Message-ID: <74289f42-8f6c-435f-a97c-896557bed9b3@windriver.com> Date: Thu, 12 Feb 2026 14:48:06 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [OE-core] [PATCH] module.bbclass: check whether CONFIG_MODULES set To: Richard Purdie , Bruce Ashfield Cc: openembedded-core@lists.openembedded.org References: <20260204020908.864912-1-kai.kang@windriver.com> <71fa18fd1ae7612c9d3f8161c6aeb2575d22e280.camel@linuxfoundation.org> <4c2fe6d55fc04781560d73fd038ee6b8d205c08e.camel@linuxfoundation.org> <260247994ff827c43a775d9f549dacb073e60f5f.camel@linuxfoundation.org> <968e666c-590a-4a08-99ab-fd4147251855@windriver.com> <450d9841bf6504e9f457b9b627006b9bdca25228.camel@linuxfoundation.org> Content-Language: en-US From: Kai In-Reply-To: <450d9841bf6504e9f457b9b627006b9bdca25228.camel@linuxfoundation.org> X-ClientProxiedBy: TYCP286CA0117.JPNP286.PROD.OUTLOOK.COM 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aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Thu, 12 Feb 2026 06:48:22 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/231014 --------------1SBFdkYxyCiPLym0l0KfV5eo Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx0a-0064b401.pphosted.com id 61C5sIOv167085 On 2/5/26 22:49, Richard Purdie wrote: > On Thu, 2026-02-05 at 17:08 +0800, Kai wrote: >> =C2=A0On 2/4/26 23:53, Richard Purdie wrote: >> =C2=A0I agree the warn conditional isn't quite right. I think it shou= ld >>> be: >>> >>> if [ CONFIG_MODULES not set in config ]; >>> =C2=A0=C2=A0=C2=A0=C2=A0bberror Broken config, CONFIG_MODULES not se= t >>> =C2=A0=C2=A0=C2=A0=C2=A0exit 1 >>> fi >>> >>> so it is basically a sanity test that the config is valid. >>> >>> I'm a bit worried about what I'm missing though :/ >>> =20 >> =C2=A0The original problem is kernel config_modules is disabled, then >> external modules such as lttng-modules can't be built. >> =20 >> Recipe lttng-tools RRECOMMENDS on lttng-modules. If install lttng- >> tools into image, it fails to build lttng-modules. >> =20 >> Kernel config=C2=A0CONFIG_MODULES couldn't be checked whether enabled = or >> disabled after bitbake parse. Then there is no >> chance to remove lttng-module from the dependencies. That why I check >> the config during the do_compile and do_install >> with bbnote and generate empty rpm package. > That is a bit different to the problem I thought this was addressing (I > was coming from the rust patches angle). > > In that case we probably need to have something like "kernel-modules" > in KERNEL_FEATURES and we check in the lttng-tools recipes if kernel- > modules are in KERNEL_FEATURES. The kernel itself can then error if the > feature is selected but not configured and lttng-modules can fail to > parse with an error if it isn't set? I sent a patch to preset LTTNGMODULES with '?=3D'. Then it could be=20 overridden from conf files to clear it. It should be the one who disable=20 kernel modules support to break the dependency betweenlttng-modules and=20 lttng-tools. Thanks, Kai > > lttng-tools is not useful without the module support. > > Cheers, > > Richard > > > > --=20 Kai Kang Wind River Linux --------------1SBFdkYxyCiPLym0l0KfV5eo Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
On 2/5/26 22:49, Richard Purdie wrote:
On Thu, 2026-02-05 at 17:08 +0800, Kai wrote:

 On 2/4/26 23:53, Richard Purdie wrote:
 I agree the warn conditional isn't quite right. I think it should

be:

if [ CONFIG_MODULES not set in config ];
    bberror Broken config, CONFIG_MODULES not set
    exit 1
fi

so it is basically a sanity test that the config is valid.

I'm a bit worried about what I'm missing though :/
 

 The original problem is kernel config_modules is disabled, then
external modules such as lttng-modules can't be built.
 
Recipe lttng-tools RRECOMMENDS on lttng-modules. If install lttng-
tools into image, it fails to build lttng-modules.
 
Kernel config CONFIG_MODULES couldn't be checked whether enabled or
disabled after bitbake parse. Then there is no
chance to remove lttng-module from the dependencies. That why I check
the config during the do_compile and do_install
with bbnote and generate empty rpm package.

That is a bit different to the problem I thought this was addressing (I
was coming from the rust patches angle).

In that case we probably need to have something like "kernel-modules"
in KERNEL_FEATURES and we check in the lttng-tools recipes if kernel-
modules are in KERNEL_FEATURES. The kernel itself can then error if the
feature is selected but not configured and lttng-modules can fail to
parse with an error if it isn't set?
I sent a patch to preset LTTNGMODULES with '?='. Then it could be overridden from conf files to clear it. It should be the one who disable kernel modules support to break the dependency between lttng-modules and lttng-tools.

Thanks, Kai


lttng-tools is not useful without the module support.

Cheers,

Richard







-- 
Kai Kang
Wind River Linux
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