Got it!  Thank you, Steevn.  Maybe I can give it a try later :)

Regards,
Ze

On Tue, May 16, 2023 at 10:20 PM Steven Rostedt [off-list ref] wrote:

On Tue, 16 May 2023 15:18:30 +0800
Ze Gao [off-list ref] wrote:

quoted

 CFLAGS_REMOVE_early.o                = $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_rethook.o              = $(CC_FLAGS_FTRACE)

 endif

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index dd61752f4c96..4070a01c11b7 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile

@@ -17,6 +17,7 @@ CFLAGS_REMOVE_ftrace.o = -pg
 CFLAGS_REMOVE_early_printk.o = -pg
 CFLAGS_REMOVE_head64.o = -pg
 CFLAGS_REMOVE_sev.o = -pg
+CFLAGS_REMOVE_rethook.o = -pg

Unrelated to this patch, but someday we need to change the -pg above to
$(CC_FLAGS_FTRACE).

-- Steve

quoted

 endif

 KASAN_SANITIZE_head$(BITS).o                         := n
--