On Sat, Jun 21, 2025 at 03:57:12PM +0200, Alexey Gladkov wrote: > The modules.builtin.modinfo file is used by userspace (kmod to be specific) to > get information about builtin modules. Among other information about the > module, > information about module aliases is stored. This is very important to > determine > that a particular modalias will be handled by a module that is inside the > kernel. > > There are several mechanisms for creating modalias for modules: > > The first is to explicitly specify the MODULE_ALIAS of the macro. In this > case, > the aliases go into the '.modinfo' section of the module if it is compiled > separately or into vmlinux.o if it is builtin into the kernel. > > The second is the use of MODULE_DEVICE_TABLE followed by the use of the > modpost utility. In this case, vmlinux.o no longer has this information and > does not get it into modules.builtin.modinfo. > > For example: > > $ modinfo pci:v00008086d0000A36Dsv00001043sd00008694bc0Csc03i30 > modinfo: ERROR: Module pci:v00008086d0000A36Dsv00001043sd00008694bc0Csc03i30 > not found. > > $ modinfo xhci_pci > name: xhci_pci > filename: (builtin) > license: GPL > file: drivers/usb/host/xhci-pci > description: xHCI PCI Host Controller Driver > > The builtin module is missing alias "pci:v*d*sv*sd*bc0Csc03i30*" which will be > generated by modpost if the module is built separately. > > To fix this it is necessary to add the generated by modpost modalias to > modules.builtin.modinfo. > > Fortunately modpost already generates .vmlinux.export.c for exported symbols. > It > is possible to use this file to create a '.modinfo' section for builtin > modules. > The modules.builtin.modinfo file becomes a composite file. One part is > extracted > from vmlinux.o, the other part from .vmlinux.export.o.
Masahiro Yamada, does this version of the patchset look better to you ? > Notes: > - v4: > * Rework the patchset based on top of Masahiro Yamada's patches. > * Add removal of unnecessary __mod_device_table__* symbols to avoid symbol > table growth in vmlinux. > * rust code takes into account changes in __mod_device_table__*. > * v3: https://lore.kernel.org/all/cover.1748335606.git.leg...@kernel.org/ > > - v3: > * Add `Reviewed-by` tag to patches from Petr Pavlu. > * Rebase to v6.15. > * v2: > https://lore.kernel.org/all/20250509164237.2886508-1-leg...@kernel.org/ > > - v2: > * Drop patch for mfd because it was already applied and is in linux-next. > * The generation of aliases for builtin modules has been redone as > suggested by Masahiro Yamada. > * Rebase to v6.15-rc5-136-g9c69f8884904 > * v1: https://lore.kernel.org/all/cover.1745591072.git.leg...@kernel.org/ > > > Alexey Gladkov (3): > scsi: Always define blogic_pci_tbl structure > modpost: Add modname to mod_device_table alias > modpost: Create modalias for builtin modules > > Masahiro Yamada (4): > module: remove meaningless 'name' parameter from __MODULE_INFO() > kbuild: always create intermediate vmlinux.unstripped > kbuild: keep .modinfo section in vmlinux.unstripped > kbuild: extract modules.builtin.modinfo from vmlinux.unstripped > > drivers/scsi/BusLogic.c | 2 - > include/asm-generic/vmlinux.lds.h | 2 +- > include/crypto/algapi.h | 4 +- > include/linux/module.h | 21 ++++----- > include/linux/moduleparam.h | 9 ++-- > include/net/tcp.h | 4 +- > rust/kernel/device_id.rs | 8 ++-- > scripts/Makefile.vmlinux | 74 +++++++++++++++++++++---------- > scripts/Makefile.vmlinux_o | 26 +---------- > scripts/mksysmap | 6 +++ > scripts/mod/file2alias.c | 34 ++++++++++++-- > scripts/mod/modpost.c | 17 ++++++- > scripts/mod/modpost.h | 2 + > 13 files changed, 131 insertions(+), 78 deletions(-) > > -- > 2.49.0 > -- Rgrds, legion
