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Thu, 13 Aug 2026 19:08:46 +0000 Message-ID: Date: Thu, 13 Aug 2026 21:08:44 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 5/5] kernel: use architecture specific names for kernels To: "Moessbauer, Felix (FT RPD CED OES-DE)" , "isar-users@googlegroups.com" References: <20260813164500.3092151-1-felix.moessbauer@siemens.com> <20260813164500.3092151-6-felix.moessbauer@siemens.com> <5cb44a40-b33e-4b1e-8ec3-f93cf278f107@siemens.com> From: "'Jan Kiszka' via isar-users" Content-Language: en-US Autocrypt: addr=jan.kiszka@siemens.com; keydata= xsFNBGZY+hkBEACkdtFD81AUVtTVX+UEiUFs7ZQPQsdFpzVmr6R3D059f+lzr4Mlg6KKAcNZ uNUqthIkgLGWzKugodvkcCK8Wbyw+1vxcl4Lw56WezLsOTfu7oi7Z0vp1XkrLcM0tofTbClW xMA964mgUlBT2m/J/ybZd945D0wU57k/smGzDAxkpJgHBrYE/iJWcu46jkGZaLjK4xcMoBWB I6hW9Njxx3Ek0fpLO3876bszc8KjcHOulKreK+ezyJ01Hvbx85s68XWN6N2ulLGtk7E/sXlb 79hylHy5QuU9mZdsRjjRGJb0H9Buzfuz0XrcwOTMJq7e7fbN0QakjivAXsmXim+s5dlKlZjr L3ILWte4ah7cGgqc06nFb5jOhnGnZwnKJlpuod3pc/BFaFGtVHvyoRgxJ9tmDZnjzMfu8YrA +MVv6muwbHnEAeh/f8e9O+oeouqTBzgcaWTq81IyS56/UD6U5GHet9Pz1MB15nnzVcyZXIoC roIhgCUkcl+5m2Z9G56bkiUcFq0IcACzjcRPWvwA09ZbRHXAK/ao/+vPAIMnU6OTx3ejsbHn oh6VpHD3tucIt+xA4/l3LlkZMt5FZjFdkZUuAVU6kBAwElNBCYcrrLYZBRkSGPGDGYZmXAW/ VkNUVTJkRg6MGIeqZmpeoaV2xaIGHBSTDX8+b0c0hT/Bgzjv8QARAQABzSNKYW4gS2lzemth IDxqYW4ua2lzemthQHNpZW1lbnMuY29tPsLBlAQTAQoAPhYhBABMZH11cs99cr20+2mdhQqf QXvYBQJmWPvXAhsDBQkFo5qABQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEGmdhQqfQXvY zPAP/jGiVJ2VgPcRWt2P8FbByfrJJAPCsos+SZpncRi7tl9yTEpS+t57h7myEKPdB3L+kxzg K3dt1UhYp4FeIHA3jpJYaFvD7kNZJZ1cU55QXrJI3xu/xfB6VhCs+VAUlt7XhOsOmTQqCpH7 pRcZ5juxZCOxXG2fTQTQo0gfF5+PQwQYUp0NdTbVox5PTx5RK3KfPqmAJsBKdwEaIkuY9FbM 9lGg8XBNzD2R/13cCd4hRrZDtyegrtocpBAruVqOZhsMb/h7Wd0TGoJ/zJr3w3WnDM08c+RA 5LHMbiA29MXq1KxlnsYDfWB8ts3HIJ3ROBvagA20mbOm26ddeFjLdGcBTrzbHbzCReEtN++s gZneKsYiueFDTxXjUOJgp8JDdVPM+++axSMo2js8TwVefTfCYt0oWMEqlQqSqgQwIuzpRO6I ik7HAFq8fssy2cY8Imofbj77uKz0BNZC/1nGG1OI9cU2jHrqsn1i95KaS6fPu4EN6XP/Gi/O 0DxND+HEyzVqhUJkvXUhTsOzgzWAvW9BlkKRiVizKM6PLsVm/XmeapGs4ir/U8OzKI+SM3R8 VMW8eovWgXNUQ9F2vS1dHO8eRn2UqDKBZSo+qCRWLRtsqNzmU4N0zuGqZSaDCvkMwF6kIRkD ZkDjjYQtoftPGchLBTUzeUa2gfOr1T4xSQUHhPL8zsFNBGZY+hkBEADb5quW4M0eaWPIjqY6 aC/vHCmpELmS/HMa5zlA0dWlxCPEjkchN8W4PB+NMOXFEJuKLLFs6+s5/KlNok/kGKg4fITf Vcd+BQd/YRks3qFifckU+kxoXpTc2bksTtLuiPkcyFmjBph/BGms35mvOA0OaEO6fQbauiHa QnYrgUQM+YD4uFoQOLnWTPmBjccoPuiJDafzLxwj4r+JH4fA/4zzDa5OFbfVq3ieYGqiBrtj tBFv5epVvGK1zoQ+Rc+h5+dCWPwC2i3cXTUVf0woepF8mUXFcNhY+Eh8vvh1lxfD35z2CJeY txMcA44Lp06kArpWDjGJddd+OTmUkFWeYtAdaCpj/GItuJcQZkaaTeiHqPPrbvXM361rtvaw XFUzUlvoW1Sb7/SeE/BtWoxkeZOgsqouXPTjlFLapvLu5g9MPNimjkYqukASq/+e8MMKP+EE v3BAFVFGvNE3UlNRh+ppBqBUZiqkzg4q2hfeTjnivgChzXlvfTx9M6BJmuDnYAho4BA6vRh4 Dr7LYTLIwGjguIuuQcP2ENN+l32nidy154zCEp5/Rv4K8SYdVegrQ7rWiULgDz9VQWo2zAjo TgFKg3AE3ujDy4V2VndtkMRYpwwuilCDQ+Bpb5ixfbFyZ4oVGs6F3jhtWN5Uu43FhHSCqUv8 FCzl44AyGulVYU7hTQARAQABwsF8BBgBCgAmFiEEAExkfXVyz31yvbT7aZ2FCp9Be9gFAmZY +hkCGwwFCQWjmoAACgkQaZ2FCp9Be9hN3g/8CdNqlOfBZGCFNZ8Kf4tpRpeN3TGmekGRpohU bBMvHYiWW8SvmCgEuBokS+Lx3pyPJQCYZDXLCq47gsLdnhVcQ2ZKNCrr9yhrj6kHxe1Sqv1S MhxD8dBqW6CFe/mbiK9wEMDIqys7L0Xy/lgCFxZswlBW3eU2Zacdo0fDzLiJm9I0C9iPZzkJ gITjoqsiIi/5c3eCY2s2OENL9VPXiH1GPQfHZ23ouiMf+ojVZ7kycLjz+nFr5A14w/B7uHjz uL6tnA+AtGCredDne66LSK3HD0vC7569sZ/j8kGKjlUtC+zm0j03iPI6gi8YeCn9b4F8sLpB lBdlqo9BB+uqoM6F8zMfIfDsqjB0r/q7WeJaI8NKfFwNOGPuo93N+WUyBi2yYCXMOgBUifm0 T6Hbf3SHQpbA56wcKPWJqAC2iFaxNDowcJij9LtEqOlToCMtDBekDwchRvqrWN1mDXLg+av8 qH4kDzsqKX8zzTzfAWFxrkXA/kFpR3JsMzNmvextkN2kOLCCHkym0zz5Y3vxaYtbXG2wTrqJ 8WpkWIE8STUhQa9AkezgucXN7r6uSrzW8IQXxBInZwFIyBgM0f/fzyNqzThFT15QMrYUqhhW ZffO4PeNJOUYfXdH13A6rbU0y6xE7Okuoa01EqNi9yqyLA8gPgg/DhOpGtK8KokCsdYsTbk= In-Reply-To: Content-Type: text/plain; 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dkim=pass header.i=@siemens.com header.s=selector2 header.b=q7nE16YE; 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 jan.kiszka@siemens.com designates 2a01:111:f403:c200::1 as permitted sender) smtp.mailfrom=jan.kiszka@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: Jan Kiszka Reply-To: Jan Kiszka 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_H2,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: HGf/2Ns8eufI On 13.08.26 20:46, Moessbauer, Felix (FT RPD CED OES-DE) wrote: > On Thu, 2026-08-13 at 19:47 +0200, Jan Kiszka wrote: >> On 13.08.26 18:45, Felix Moessbauer wrote: >>> The kernel source packages are architecture specific. By that, we also >>> have to encode the architecture in the KERNEL_NAME, if that is not >>> already implicitly the case (e.g. when building a kernel for a specific >>> machine). >>> >>> For the kernel recipes which are generic (like mainline and cip), we >>> simply extend the PN with -${DISTRO_ARCH}, so bitbake can find the >>> dependency and instanciate an architecture specific variant. >>> >>> By that, we also need to adapt the default in test_per_kernel, which >>> explicitly builds the module for the kernel that corresponds to the >>> multiconfig target. >>> >>> Signed-off-by: Felix Moessbauer >>> --- >>> RECIPE-API-CHANGELOG.md | 18 ++++++++++++++++++ >>> meta-isar/conf/machine/beagleplay.conf | 2 +- >>> meta-isar/conf/machine/de0-nano-soc.conf | 2 +- >>> meta-isar/conf/machine/hikey.conf | 2 +- >>> meta-isar/conf/machine/qemuamd64-cip.conf | 2 +- >>> meta-isar/conf/machine/sifive-fu540.conf | 2 +- >>> meta-isar/conf/machine/stm32mp15x.conf | 2 +- >>> .../linux/linux-cip_4.4.166-cip29.bb | 2 ++ >>> .../linux/linux-mainline_6.12.85.bb | 2 ++ >>> testsuite/citest.py | 2 +- >>> 10 files changed, 29 insertions(+), 7 deletions(-) >>> >>> diff --git a/RECIPE-API-CHANGELOG.md b/RECIPE-API-CHANGELOG.md >>> index 2db05169..c13a3b3f 100644 >>> --- a/RECIPE-API-CHANGELOG.md >>> +++ b/RECIPE-API-CHANGELOG.md >>> @@ -1175,6 +1175,24 @@ DPKG_ARCH ?= "${DISTRO_ARCH}" >>> >>> Firmware packages are an exception because they are built for only one architecture. >>> >>> +### Kernel source packages are architecture specific >>> + >>> +Kernel source packages have always contained architecture-specific content, but >> >> See my comment on the cover letter: architecture or even >> machine-specific content. > > This does not invalidate this statement. It just means there could be > even more differences. Anyways, just a cover letter ;) > >> >>> +this was not previously enforced. As a result, builds for multiple architectures >>> +could publish different source packages with the same name and version. >>> + >>> +Generic kernel recipes can append `${DISTRO_ARCH}` to `PN`, to provide the >>> +kernel for all architectures. >>> + >>> +``` >>> +PN .= "-${DISTRO_ARCH}" >>> +``` >>> + >>> +For a kernel built for only one target, the name may remain unchanged. When >>> +building multiple instances of a kernel selected by the same `KERNEL_NAME`, use >>> +`${DISTRO_ARCH}` in the name for architecture-specific kernels, or `${MACHINE}` >>> +for machine-specific kernels. >>> + >> >> This is not written like a recipe API change. This way, it looks like >> something that belongs into the user manual, kernel section, as it >> provides guidance on how to model that special case. You need to >> explain, when this is now required while it was not before. >> >> But I would rather suggest modelling that more transparently, via >> PROVIDES: The KERNEL_NAME should remain "mainline", e.g., and the >> recipes should PROVIDE that generic name while actually building >> "mainline-$DISTRO_ARCH". > > And this is exactly what "option 2" from [1] proposes, which I tried > and which does not work for two reasons: > > 1. on bitbake side, the provides and depends need to be fiddled through > the multiarch classes (-native), which I did not manage to implement. > For the kernel it worked, but not for the module recipes. It also gets > super messy on multiconfig builds with two different kernels (e.g. a > hardened one for the image and a "open" one for the installer). > > 2. We need provides on the debian package names as well, but resolving > multiple provides in the dependency install stages (sbuild and rootfs > install) is tricky, as we already know from other tries in this > direction. Let's better address the root cause: needless templating, rather than build-time config selection (provided we have no problems with native kbuild packages vs. configs). Jan -- Siemens AG, Foundational Technologies Linux Expert Center -- You received this message because you are subscribed to the Google Groups "isar-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to isar-users+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/isar-users/e4e31361-8f47-475f-9acf-a2021de0fa53%40siemens.com.