[170/262] mm/migrate: de-duplicate migrate_reason strings

Commit Message

Andrew Morton Nov. 5, 2021, 8:43 p.m. UTC

From: John Hubbard <[e-mail]>
Subject: mm/migrate: de-duplicate migrate_reason strings

In order to remove the need to manually keep three different files in
synch, provide a common definition of the mapping between enum
migrate_reason, and the associated strings for each enum item.

1. Use the tracing system's mapping of enums to strings, by redefining
   and reusing the MIGRATE_REASON and supporting macros, and using that to
   populate the string array in mm/debug.c.

2. Move enum migrate_reason to migrate_mode.h.  This is not strictly
   necessary for this patch, but migrate mode and migrate reason go
   together, so this will slightly clarify things.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: John Hubbard <[e-mail]>
Reviewed-by: Weizhao Ouyang <[e-mail]>
Cc: "Huang, Ying" <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 include/linux/migrate.h      |   19 +------------------
 include/linux/migrate_mode.h |   13 +++++++++++++
 mm/debug.c                   |   20 +++++++++++---------
 3 files changed, 25 insertions(+), 27 deletions(-)

Patch

--- a/include/linux/migrate.h~mm-migrate-de-duplicate-migrate_reason-strings
+++ a/include/linux/migrate.h
@@ -19,24 +19,7 @@  struct migration_target_control;
  */
 #define MIGRATEPAGE_SUCCESS		0
 
-/*
- * Keep sync with:
- * - macro MIGRATE_REASON in include/trace/events/migrate.h
- * - migrate_reason_names[MR_TYPES] in mm/debug.c
- */
-enum migrate_reason {
-	MR_COMPACTION,
-	MR_MEMORY_FAILURE,
-	MR_MEMORY_HOTPLUG,
-	MR_SYSCALL,		/* also applies to cpusets */
-	MR_MEMPOLICY_MBIND,
-	MR_NUMA_MISPLACED,
-	MR_CONTIG_RANGE,
-	MR_LONGTERM_PIN,
-	MR_DEMOTION,
-	MR_TYPES
-};
-
+/* Defined in mm/debug.c: */
 extern const char *migrate_reason_names[MR_TYPES];
 
 #ifdef CONFIG_MIGRATION
--- a/include/linux/migrate_mode.h~mm-migrate-de-duplicate-migrate_reason-strings
+++ a/include/linux/migrate_mode.h
@@ -19,4 +19,17 @@  enum migrate_mode {
 	MIGRATE_SYNC_NO_COPY,
 };
 
+enum migrate_reason {
+	MR_COMPACTION,
+	MR_MEMORY_FAILURE,
+	MR_MEMORY_HOTPLUG,
+	MR_SYSCALL,		/* also applies to cpusets */
+	MR_MEMPOLICY_MBIND,
+	MR_NUMA_MISPLACED,
+	MR_CONTIG_RANGE,
+	MR_LONGTERM_PIN,
+	MR_DEMOTION,
+	MR_TYPES
+};
+
 #endif		/* MIGRATE_MODE_H_INCLUDED */
--- a/mm/debug.c~mm-migrate-de-duplicate-migrate_reason-strings
+++ a/mm/debug.c
@@ -16,17 +16,19 @@ 
 #include <linux/ctype.h>
 
 #include "internal.h"
+#include <trace/events/migrate.h>
+
+/*
+ * Define EM() and EMe() so that MIGRATE_REASON from trace/events/migrate.h can
+ * be used to populate migrate_reason_names[].
+ */
+#undef EM
+#undef EMe
+#define EM(a, b)	b,
+#define EMe(a, b)	b
 
 const char *migrate_reason_names[MR_TYPES] = {
-	"compaction",
-	"memory_failure",
-	"memory_hotplug",
-	"syscall_or_cpuset",
-	"mempolicy_mbind",
-	"numa_misplaced",
-	"contig_range",
-	"longterm_pin",
-	"demotion",
+	MIGRATE_REASON
 };
 
 const struct trace_print_flags pageflag_names[] = {