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charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "},"content":"BugLink: https://bugs.launchpad.net/bugs/2147065\n\n[ Impact ]\n\nThe noble 6.8 kernel fails to build when CONFIG_PCI_EPF_TEST is enabled, with\nthe following error:\n\n```\n CC [M] drivers/pci/endpoint/functions/pci-epf-test.o\n drivers/pci/endpoint/functions/pci-epf-test.c: In function 'pci_epf_test_alloc_space':\n drivers/pci/endpoint/functions/pci-epf-test.c:863:33: error: 'const struct pci_epc_features' has no member named 'bar'\n 863 | if (epc_features->bar[bar].type == BAR_FIXED)\n | ^~\n drivers/pci/endpoint/functions/pci-epf-test.c:863:52: error: 'BAR_FIXED' undeclared (first use in this function)\n 863 | if (epc_features->bar[bar].type == BAR_FIXED)\n | ^~~~~~~~~\n drivers/pci/endpoint/functions/pci-epf-test.c:863:52: note: each undeclared identifier is reported only once for each function it appears in\n drivers/pci/endpoint/functions/pci-epf-test.c:864:53: error: 'const struct pci_epc_features' has no member named 'bar'\n 864 | test_reg_size = epc_features->bar[bar].fixed_size;\n | ^~\n make[8]: *** [scripts/Makefile.build:243: drivers/pci/endpoint/functions/pci-epf-test.o] Error 1\n make[7]: *** [scripts/Makefile.build:481: drivers/pci/endpoint/functions] Error 2\n make[6]: *** [scripts/Makefile.build:481: drivers/pci/endpoint] Error 2\n```\n\nThis is due to the inclusion of the linux-6.12.y upstream stable commit:\ne741dabcc52b (\"PCI: endpoint: pci-epf-test: Limit PCIe BAR size for fixed BARs\")\nwithout including the dependent (non-stable) commit:\ne01c9797c0eb (\"PCI: endpoint: Clean up hardware description for BARs\")\n\nThe 6.12 commit does not fix any issues that have been observed with the 6.8\nnoble kernel, so it should be reverted. After doing so, the kernel compiles\nwhen the config is enabled.\n\n[ Test Plan ]\n\n1. Apply the revert.\n2. Enable CONFIG_PCI_EPF_TEST in the generic 6.8 kernel\n3. Compile the kernel.\n\nThe compilation should succeed with the revert.\n\n[ Where problems could occur ]\n\nSince this config is disabled in Ubuntu by default, it has not been tested in\nthe past. Even though it compiles with this fix, that does not guarantee\ncorrect behaviour in the features that the config enables. For example,\nreverting this commit means the feature will definitely not work with\ncontrollers with too-small fixed BAR sizes, as that is what the commit fixes\nupstream. If it is needed, a full backport of the commit and its dependents will\nbe necessary.\n\n[ Other Info ]\n\nFor context, this issue was found because the noble:linux-nvidia-tegra kernel\nneeds to enable PCI_EPF_TEST, so more issues may be found once that gets further\ntesting.\n\nNoah Wager (1):\n UBUNTU: SAUCE: Revert \"PCI: endpoint: pci-epf-test: Limit PCIe BAR\n size for fixed BARs\"\n\n drivers/pci/endpoint/functions/pci-epf-test.c | 7 +------\n 1 file changed, 1 insertion(+), 6 deletions(-)"}