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Tue, 8 Apr 2025 08:34:59 +0000 From: "'cedric.hombourger@siemens.com' via isar-users" To: "Bezdeka, Florian" , "Larson, Chris" , "isar-users@googlegroups.com" Subject: Re: [PATCH 0/2] Add support for per-kernel recipe variants Thread-Topic: [PATCH 0/2] Add support for per-kernel recipe variants Thread-Index: AQHbp9Zl2SztKNOLnUCvc1ioOX41JbOZa4sAgAACUICAAAMiAIAAAY8A Date: Tue, 8 Apr 2025 08:34:59 +0000 Message-ID: <25d9b413d25d6bc207ae17ed5d184b121a7586ce.camel@siemens.com> References: <20250407160148.443385-1-chris.larson@siemens.com> <06034fe351d1b0f718c5de20fcfd4069ce1bd497.camel@siemens.com> <9d9b56bd32d249bb97e50a1447870a1a6438facf.camel@siemens.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Evolution 3.44.4-0ubuntu2+intune x-ms-publictraffictype: Email x-ms-traffictypediagnostic: AS8PR10MB7875:EE_|GV1PR10MB5841:EE_ x-ms-office365-filtering-correlation-id: 1d52f6e4-2c0f-4c4a-e15b-08dd76783fc1 x-ms-exchange-atpmessageproperties: SA x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|376014|366016|1800799024|38070700018; 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charset="UTF-8" Content-ID: <79143B9B1F7AE44D8EDAD72BCEE98DF9@EURPRD10.PROD.OUTLOOK.COM> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AS8PR10MB7875.EURPRD10.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: 1d52f6e4-2c0f-4c4a-e15b-08dd76783fc1 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Apr 2025 08:34:59.4031 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 38ae3bcd-9579-4fd4-adda-b42e1495d55a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: uuv0pm7oQoMnp6udtfWMGIr8K1KRqLYn1Da7xENAKR8f7EU5FmnLMtcnquueyguTCOUQbw6ddG9HEATyX4CzP8kk8i1N6EiMfvswjOi8Xcw= X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV1PR10MB5841 X-Original-Sender: cedric.hombourger@siemens.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@siemens.com header.s=selector2 header.b=AafEtYZp; arc=pass (i=1 spf=pass spfdomain=siemens.com dkim=pass dkdomain=siemens.com dmarc=pass fromdomain=siemens.com); spf=pass (google.com: domain of cedric.hombourger@siemens.com designates 2a01:111:f403:c207::3 as permitted sender) smtp.mailfrom=cedric.hombourger@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: "cedric.hombourger@siemens.com" Reply-To: "cedric.hombourger@siemens.com" Precedence: list Mailing-list: list isar-users@googlegroups.com; contact isar-users+owners@googlegroups.com List-ID: X-Spam-Checked-In-Group: isar-users@googlegroups.com X-Google-Group-Id: 914930254986 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Status: No, score=-4.9 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL, RCVD_IN_RP_CERTIFIED,RCVD_IN_RP_RNBL,RCVD_IN_RP_SAFE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on shymkent.ilbers.de X-TUID: VAH/Vs3Xg1pb On Tue, 2025-04-08 at 10:29 +0200, Florian Bezdeka wrote: > On Tue, 2025-04-08 at 08:18 +0000, Hombourger, Cedric (FT FDS CES LX) > wrote: > > On Tue, 2025-04-08 at 10:09 +0200, Florian Bezdeka wrote: > > > On Mon, 2025-04-07 at 09:01 -0700, chris.larson via isar-users > > > wrote: > > > > From: Christopher Larson > > > >=20 > > > > Add support for per-kernel recipe variants. This aids in the > > > > ability for a > > > > MACHINE to support multiple kernels, by allowing us to generate > > > > per-kernel > > > > variants in recipes like external kernel modules. > > > >=20 > > > > A new variable KERNEL_NAMES will list the kernels for which > > > > variants will be > > > > generated. It defaults to KERNEL_NAME. While this variable > > > > lists > > > > all supported > > > > kernels for the current machine, a variant will not be > > > > generated > > > > for > > > > KERNEL_NAME, assuming that's the recipe's baseline. Each > > > > variant > > > > listed in > > > > KERNEL_NAMES will add kernel- to the OVERRIDES > > > > variable, and > > > > per-kernel: to the BBCLASSEXTEND variable. In > > > > addition, > > > > KERNEL_NAME will be set to the kernel name for the current > > > > variant. > > >=20 > > > I'm missing the documentation for the new `KERNEL_NAMES` > > > variable. > > >=20 > > > In addition you explained how this works, but what is the use > > > case > > > behind? I can build multiple kernels per machine now, but when is > > > this > > > needed? > >=20 > > If you are wanting a concrete use-case noted in the documentation, > > it > > can certainly be added: no harm. > >=20 > > Concretely there are machine-supporting layers offering multiple > > kernels. Examples: "normal" kernel, PREEMPT_RT kernel. Another use- > > case > > until we get a .deb for each .ko (like in Yocto you can get an ipk > > for > > each ko), you may need a footprint-optimized kernel for e.g. a > > recovery > > image. > >=20 > > I hope that explains. Do let us know if the use-cases should be > > listed > > in the documentation. It would not be an issue to add them >=20 > I think it's worth to document KERNEL_NAMES with a complete example. >=20 > As I understand KERNEL_NAMES for now it's for building. So you can > build / select different kernels for your machine. OK, but where is > the > decision taken which kernel is installed into which image? Good question. And probably worth noting in the documentation as well. As I have tested this patch on my setup, KERNEL_NAME remains the kernel that goes into your image. Hopefully IMAGE_INSTALL directives for out- of-tree kernel modules would be of the form "my-custom-module- ${KERNEL_NAME}" and not e.g. "my-custom-module-${MACHINE}" or some other hard-coded value but that's independent from this change. In other words, I don't think Chris has changed any "APIs" but indeed added some variables that should be documented as you suggested earlier. Let's wait for Chris to come online and chime in. >=20 > That's the missing part for me. >=20 > >=20 > > >=20 > > > >=20 > > > > In a recipe that already uses KERNEL_NAME and appends it to its > > > > PN, > > > > all you > > > > need to do to use this is to inherit per-kernel, and add any > > > > additional kernels > > > > you want to support to KERNEL_NAMES. The second patch in this > > > > series > > > > does so for external kernel modules by default, but this will > > > > have > > > > no effect > > > > on existing recipes unless KERNEL_NAMES is set to something > > > > other > > > > than > > > > KERNEL_NAME. > > > >=20 > > > > Christopher Larson (2): > > > > =C2=A0 per-kernel.bbclass: add class > > > > =C2=A0 linux-module: inherit per-kernel > > > >=20 > > > > =C2=A0meta/classes/per-kernel.bbclass=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 35 > > > > +++++++++++++++++++++ > > > > =C2=A0meta/recipes-kernel/linux-module/module.inc |=C2=A0 2 +- > > > > =C2=A02 files changed, 36 insertions(+), 1 deletion(-) > > > > =C2=A0create mode 100644 meta/classes/per-kernel.bbclass > > > >=20 > > > > --=20 > > > > 2.47.2 > > >=20 >=20 --=20 Cedric Hombourger Siemens AG www.siemens.com --=20 You received this message because you are subscribed to the Google Groups "= isar-users" group. 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