On Fri, 9 Oct 2020 14:05:48 -0700
Sami Tolvanen [off-list ref] 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.

-- Steve

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 89263210ab26..3042619e21b7 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig

@@ -606,7 +606,7 @@ config FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
 
 config FTRACE_MCOUNT_USE_CC
 	def_bool y
-	depends on $(cc-option,-mrecord-mcount)
+	depends on $(cc-option,-mrecord-mcount1)
 	depends on !FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
 	depends on FTRACE_MCOUNT_RECORD
 

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