Hi all, static_call(), is the idea of static_branch() applied to indirect function calls. Remove a data load (indirection) by modifying the text.
The inline implementation still relies on objtool to generate the .static_call_sites section, mostly because this is a natural place for x86_64 and works for both GCC and LLVM. Other architectures can pick other means if/when they implement the inline patching. The out-of-line (aka. trampoline) variant doesn't require this. Patches go on top of linus' tree. Changes since last time: - rebased - review feedback from Steve
