Subject: Upcoming merge conflict between ftrace and s390 trees

From: Heiko Carstens <[email-masked]>
Date: Wed, 20 Oct 2021 16:40:39 +0200

Hi Stephen,

just as heads-up: there will be an upcoming merge conflict between
ftrace and s390 trees in linux-next which will cause a compile error
for s390.

With the s390 tree this commit is already in linux-next:
https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=c316eb4460463b6dd1aee6d241cb20323a0030aa

And soon this patch will likely be within the ftrace tree:
https://lore.kernel.org/lkml/[email-masked]/

Maybe Steven could reply to this when he applies it.

This would be required to fix the conflict:

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 999907dd7544..d654b95a1e3e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -190,6 +190,7 @@ config X86
 	select HAVE_DYNAMIC_FTRACE_WITH_ARGS	if X86_64
 	select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
 	select HAVE_SAMPLE_FTRACE_DIRECT	if X86_64
+	select HAVE_SAMPLE_FTRACE_MULTI_DIRECT	if X86_64
 	select HAVE_EBPF_JIT
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS
 	select HAVE_EISA
diff --git a/samples/Kconfig b/samples/Kconfig
index 0823b97d8546..7561f3e42296 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -229,3 +229,6 @@ endif # SAMPLES
 
 config HAVE_SAMPLE_FTRACE_DIRECT
 	bool
+
+config HAVE_SAMPLE_FTRACE_MULTI_DIRECT
+	bool
diff --git a/samples/Makefile b/samples/Makefile
index 291663e56a3c..7a38538b577d 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -21,6 +21,7 @@ subdir-$(CONFIG_SAMPLE_TIMER)		+= timers
 obj-$(CONFIG_SAMPLE_TRACE_EVENTS)	+= trace_events/
 obj-$(CONFIG_SAMPLE_TRACE_PRINTK)	+= trace_printk/
 obj-$(CONFIG_SAMPLE_FTRACE_DIRECT)	+= ftrace/
+obj-$(CONFIG_SAMPLE_FTRACE_MULTI_DIRECT) += ftrace/
 obj-$(CONFIG_SAMPLE_TRACE_ARRAY)	+= ftrace/
 subdir-$(CONFIG_SAMPLE_UHID)		+= uhid
 obj-$(CONFIG_VIDEO_PCI_SKELETON)	+= v4l/
diff --git a/samples/ftrace/Makefile b/samples/ftrace/Makefile
index ab1d1c05c288..e8a3f8520a44 100644
--- a/samples/ftrace/Makefile
+++ b/samples/ftrace/Makefile
@@ -3,7 +3,7 @@
 obj-$(CONFIG_SAMPLE_FTRACE_DIRECT) += ftrace-direct.o
 obj-$(CONFIG_SAMPLE_FTRACE_DIRECT) += ftrace-direct-too.o
 obj-$(CONFIG_SAMPLE_FTRACE_DIRECT) += ftrace-direct-modify.o
-obj-$(CONFIG_SAMPLE_FTRACE_DIRECT) += ftrace-direct-multi.o
+obj-$(CONFIG_SAMPLE_FTRACE_MULTI_DIRECT) += ftrace-direct-multi.o
 
 CFLAGS_sample-trace-array.o := -I$(src)
 obj-$(CONFIG_SAMPLE_TRACE_ARRAY) += sample-trace-array.o