On Tue, Sep 03, 2024 at 10:32:00AM -0700, Song Liu wrote: > Hi Josh, > > Thanks for the patchset! We really need this work so that we can undo our > hack for LTO enabled kernels. > > On Mon, Sep 2, 2024 at 9:00 PM Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote: > > > > Hi, > > > > Here's a new way to build livepatch modules called klp-build. > > > > I started working on it when I realized that objtool already does 99% of > > the work needed for detecting function changes. > > > > This is similar in concept to kpatch-build, but the implementation is > > much cleaner. > > > > Personally I still have reservations about the "source-based" approach > > (klp-convert and friends), including the fragility and performance > > concerns of -flive-patching. I would submit that klp-build might be > > considered the "official" way to make livepatch modules. > > > > Please try it out and let me know what you think. Based on v6.10. > > > > Also avaiable at: > > > > git://git.kernel.org/pub/scm/linux/kernel/git/jpoimboe/linux.git klp-build-rfc > > I tried to compile the code in this branch with gcc-12 and llvm-18. Some > of these errors are easy to fix (attached below). But some are trickier, for > example: > > with gcc-12: > ... > BTFIDS vmlinux > NM System.map > SORTTAB vmlinux > incomplete ORC unwind tables in file: vmlinux > Failed to sort kernel tables Thanks for trying it! If you share your config(s) I can look into it. I haven't tried clang yet, but will soon. -- Josh
