On Tue, Apr 9, 2024, at 17:01, Ard Biesheuvel wrote: > From: Ard Biesheuvel <ardb@xxxxxxxxxx> > > If the BTF code is enabled in the build configuration, the start/stop > BTF markers are guaranteed to exist in the final link but not during the > first linker pass. > > Avoid GOT based relocations to these markers in the final executable by > providing preliminary definitions that will be used by the first linker > pass, and superseded by the actual definitions in the subsequent ones. > > Make the preliminary definitions dependent on CONFIG_DEBUG_INFO_BTF so > that inadvertent references to this section will trigger a link failure > if they occur in code that does not honour CONFIG_DEBUG_INFO_BTF. > > Note that Clang will notice that taking the address of__start_BTF cannot > yield NULL any longer, so testing for that condition is no longer > needed. > > Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx> > Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx> Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
