fix: tie compaction probe build to CONFIG_COMPACTION

[lttng-modules.git] / src / probes / Kbuild

diff --git a/src/probes/Kbuild b/src/probes/Kbuild
index 0fc7e9c2b50c1db156c5cf251320d95f10f3d341..3e556b8e1d72c7225e768baac8ee06930e27f62b 100644 (file)
--- a/src/probes/Kbuild
+++ b/src/probes/Kbuild
@@ -2,7 +2,7 @@
 
 TOP_LTTNG_MODULES_DIR := $(shell dirname $(lastword $(MAKEFILE_LIST)))/../..
 
-include $(TOP_LTTNG_MODULES_DIR)/Kbuild.common
+include $(TOP_LTTNG_MODULES_DIR)/src/Kbuild.common
 
 ccflags-y += -I$(TOP_LTTNG_MODULES_DIR)/include
 
@@ -167,7 +167,24 @@ ifneq ($(CONFIG_BTRFS_FS),)
   endif # $(wildcard $(btrfs_dep))
 endif # CONFIG_BTRFS_FS
 
-obj-$(CONFIG_LTTNG) += lttng-probe-compaction.o
+ifneq ($(CONFIG_COMPACTION),)
+  # A dependency on internal header 'mm/internal.h' was introduced in v5.18
+  compaction_dep = $(srctree)/mm/internal.h
+  compaction_dep_wildcard = $(wildcard $(compaction_dep))
+  compaction_dep_check = $(shell \
+  if [ \( $(VERSION) -ge 6 \
+     -o \( $(VERSION) -eq 5 -a $(PATCHLEVEL) -ge 18 \) \) -a \
+     -z "$(compaction_dep_wildcard)" ] ; then \
+    echo "warn" ; \
+  else \
+    echo "ok" ; \
+  fi ;)
+  ifeq ($(compaction_dep_check),ok)
+    obj-$(CONFIG_LTTNG) += lttng-probe-compaction.o
+  else
+    $(warning Files $(compaction_dep) not found. Probe "compaction" is disabled. Use full kernel source tree to enable it.)
+  endif # $(wildcard $(compaction_dep))
+endif # CONFIG_COMPACTION
 
 ifneq ($(CONFIG_EXT4_FS),)
   ext4_dep = $(srctree)/fs/ext4/*.h
@@ -187,13 +204,11 @@ ifneq ($(CONFIG_FRAME_WARN),0)
   CFLAGS_lttng-probe-printk.o += -Wframe-larger-than=2200
 endif
 
-obj-$(CONFIG_LTTNG) +=  $(shell \
-    if [ $(VERSION) -ge 4 \
-      -o \( $(VERSION) -eq 3 -a $(PATCHLEVEL) -ge 6 \) \
-      -o \( $(VERSION) -eq 3 -a $(PATCHLEVEL) -eq 5 -a $(SUBLEVEL) -ge 2 \) \
-      -o \( $(VERSION) -eq 3 -a $(PATCHLEVEL) -eq 4 -a $(SUBLEVEL) -ge 9 \) \
-      -o \( $(VERSION) -eq 3 -a $(PATCHLEVEL) -eq 0 -a $(SUBLEVEL) -ge 41 \) ] ; then \
-      echo "lttng-probe-random.o" ; fi;)
+# Introduced in v3.6, remove in v5.18
+random_dep = $(srctree)/include/trace/events/random.h
+ifneq ($(wildcard $(random_dep)),)
+  obj-$(CONFIG_LTTNG) += lttng-probe-random.o
+endif
 
 obj-$(CONFIG_LTTNG) +=  $(shell \
   if [ $(VERSION) -ge 4 \