On 13/04/25 13:14, Bastian Blank wrote:
So we can only ship rust source in any way and the
kernel module make stuff needs to rebuild anything for the external
modules.
Yep, this seems to work [1]. The two tests I did are:
1. Native build on arm64. Installed the build on amd64, replaced the
Rust files (rmeta and libmacros) with ones obtained by cross-compiling
the same kernel with the same config on amd64. Pointing KDIR to the
natively-built /usr/src/linux-headers with the replaced Rust files
correctly builds the OOT module, and the module correctly loads on arm64.
2. Cross-build on amd64. Installed the build on arm64, replaced the Rust
files with those from the twin native build. Same as above, the module
builds and correctly loads on arm64.
This seems to be the way to go, although my limited testing may well be
neglecting unknown failure modes.
[1] At least with MODVERSIONS enabled. Not sure what would happen with
MODVERSIONS disabled, perhaps nothing, as long as the kernel version
remains the same?
