On Fri, Oct 9, 2020 at 4:38 PM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > > On Fri, 9 Oct 2020 14:05:48 -0700 > Sami Tolvanen <samitolvanen@xxxxxxxxxx> wrote: > > > Ah yes, X86_DECODER_SELFTEST seems to be broken in tip/master. If you > > prefer, I have these patches on top of mainline here: > > > > https://github.com/samitolvanen/linux/tree/clang-lto > > > > Testing your config with LTO on this tree, it does build and boot for > > me, although I saw a couple of new objtool warnings, and with LLVM=1, > > one warning from llvm-objdump. > > Thanks, I disabled X86_DECODER_SELFTEST and it now builds. > > I forced the objdump mcount logic with the below patch, which produces: > > CONFIG_FTRACE_MCOUNT_RECORD=y > CONFIG_FTRACE_MCOUNT_USE_OBJTOOL=y > > But I don't see the __mcount_loc sections being created. > > I applied patches 1 - 6. Patch 6 is missing the part where we actually pass --mcount to objtool, it's in patch 11 ("kbuild: lto: postpone objtool"). I'll fix this in v6. In the meanwhile, please apply patches 1-11 to test the objtool change. Do you have any thoughts about the approach otherwise? Sami
