[PATCH v4 2/9] mm/vmscan: move vmscan tracepoints to a local header

[Ridong Chen <ridong.chen@linux.dev>]

From: Ridong Chen <chenridong@xiaomi.com>

Move include/trace/events/vmscan.h to mm/trace_vmscan.h so that the
tracepoints can be extended to reference vmscan-internal structures such
as struct scan_control, which is not visible outside mm/.  This mirrors
what several other subsystems already do with their trace headers (e.g.
fs/fuse/fuse_trace.h, fs/gfs2/trace_gfs2.h, fs/lockd/trace.h).  As they
do, set TRACE_INCLUDE_PATH to "." and add mm/ to the include path of
vmscan.o, the only user that defines CREATE_TRACE_POINTS.

No functional change.

Assisted-by: LLM
Signed-off-by: Ridong Chen <chenridong@xiaomi.com>
---
 MAINTAINERS                                        | 2 ++
 mm/Makefile                                        | 1 +
 mm/shrinker.c                                      | 2 +-
 include/trace/events/vmscan.h => mm/trace_vmscan.h | 4 ++++
 mm/vmscan.c                                        | 2 +-
 5 files changed, 9 insertions(+), 2 deletions(-)
 rename include/trace/events/vmscan.h => mm/trace_vmscan.h (99%)

diff --git a/MAINTAINERS b/MAINTAINERS
index 6f1f35a017a6..c41af07e870e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17231,6 +17231,7 @@ F:	Documentation/admin-guide/mm/multigen_lru.rst
 F:	Documentation/mm/multigen_lru.rst
 F:	include/linux/mm_inline.h
 F:	include/linux/mmzone.h
+F:	mm/trace_vmscan.h
 F:	mm/vmscan.c
 F:	mm/workingset.c
 
@@ -17380,6 +17381,7 @@ R:	Shakeel Butt <shakeel.butt@linux.dev>
 R:	Lorenzo Stoakes <ljs@kernel.org>
 L:	linux-mm@kvack.org
 S:	Maintained
+F:	mm/trace_vmscan.h
 F:	mm/vmscan.c
 F:	mm/workingset.c
 
diff --git a/mm/Makefile b/mm/Makefile
index 2a3ec53d62ee..277b97f7f8d7 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -32,6 +32,7 @@ KCOV_INSTRUMENT_vmstat.o := n
 KCOV_INSTRUMENT_failslab.o := n
 
 CFLAGS_init-mm.o += -Wno-override-init
+CFLAGS_vmscan.o += -I$(src)
 
 mmu-y			:= nommu.o
 mmu-$(CONFIG_MMU)	:= highmem.o memory.o mincore.o \
diff --git a/mm/shrinker.c b/mm/shrinker.c
index 7ec2a9704f6f..3c3e87c4b61c 100644
--- a/mm/shrinker.c
+++ b/mm/shrinker.c
@@ -3,7 +3,7 @@
 #include <linux/rwsem.h>
 #include <linux/shrinker.h>
 #include <linux/rculist.h>
-#include <trace/events/vmscan.h>
+#include "trace_vmscan.h"
 
 #include "internal.h"
 
diff --git a/include/trace/events/vmscan.h b/mm/trace_vmscan.h
similarity index 99%
rename from include/trace/events/vmscan.h
rename to mm/trace_vmscan.h
index 8a872990b4be..ad90f0e9bf2e 100644
--- a/include/trace/events/vmscan.h
+++ b/mm/trace_vmscan.h
@@ -648,4 +648,8 @@ TRACE_EVENT(mm_vmscan_kswapd_clear_hopeless,
 #endif /* _TRACE_VMSCAN_H */
 
 /* This part must be outside protection */
+#undef TRACE_INCLUDE_FILE
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE trace_vmscan
 #include <trace/define_trace.h>
diff --git a/mm/vmscan.c b/mm/vmscan.c
index e82ba737c028..a3538484f8da 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -71,7 +71,7 @@
 #include "swap.h"
 
 #define CREATE_TRACE_POINTS
-#include <trace/events/vmscan.h>
+#include "trace_vmscan.h"
 
 struct scan_control {
 	/* How many pages shrink_list() should reclaim */
-- 
2.34.1