On 5/5/25 23:24, Sami Tolvanen wrote: > In rare situations where distributions must make significant > changes to otherwise opaque data structures that have > inadvertently been included in the published ABI, keeping > symbol versions stable using the existing kABI macros can > become tedious. > > For example, Android decided to switch to a newer io_uring > implementation in the 5.10 GKI kernel "to resolve a huge number > of potential, and known, problems with the codebase," requiring > "horrible hacks" with genksyms: > > "A number of the io_uring structures get used in other core > kernel structures, only as "opaque" pointers, so there is > not any real ABI breakage. But, due to the visibility of > the structures going away, the CRC values of many scheduler > variables and functions were changed." > -- https://r.android.com/2425293 > > While these specific changes probably could have been hidden > from gendwarfksyms using the existing kABI macros, this may not > always be the case. > > Add a last resort kABI rule that allows distribution > maintainers to fully override a type string for a symbol or a > type. Also add a more informative error message in case we find > a non-existent type references when calculating versions. > > Suggested-by: Giuliano Procida <gprocida@xxxxxxxxxx> > Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx> Reviewed-by: Petr Pavlu <petr.pavlu@xxxxxxxx> -- Thanks, Petr
