On Tue, Dec 3, 2019 at 4:00 PM Qian Cai <cai@xxxxxx> wrote: > > > > > On Dec 3, 2019, at 9:35 AM, Alexander Potapenko <glider@xxxxxxxxxx> wrote: > > > > At this point I don't really know why KMSAN and lockdep don't play > > well together, but I'm not expecting anyone to use them together > > either. > > Of course people will use those together. For example, distro debug kernel variants. Some tools are just not designed to work together. For example, you won't be able to compile the kernel with both KASAN and KMSAN enabled at the same time. Lockdep doesn't require any instrumentation to work, so it _might_ be possible to make it work with KMSAN, but it will probably still slow down the things to an unacceptable level. I'm inclining towards disabling the two together for now, unless anyone is willing to address that issue. Please let me know if you think I need to keep the link to https://github.com/google/kmsan/issues/57 in the Kconfig comment, right now it looks like: # KMSAN is currently incompatible with lockdep. -- Alexander Potapenko Software Engineer Google Germany GmbH Erika-Mann-Straße, 33 80636 München Geschäftsführer: Paul Manicle, Halimah DeLaine Prado Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg
