mm: move alloc tag to mm

The alloc tagging work is really mm-specific, so move alloc_tag.c to mm/
and additionally update the MAINTAINERS entry to place it within memory
management and port over the Kconfig and Makefile code to mm.

Link: https://lore.kernel.org/20260625184857.2193482-3-surenb@google.com
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Tested-by: Hao Ge <hao.ge@linux.dev>
Acked-by: Hao Ge <hao.ge@linux.dev>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Harry Yoo (Oracle) <harry@kernel.org>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

MAINTAINERS

@@ -16887,16 +16887,6 @@ F:	mm/mm_init.c
 F:	mm/rodata_test.c
 F:	tools/testing/memblock/
 
-MEMORY ALLOCATION PROFILING
-M:	Suren Baghdasaryan <surenb@google.com>
-R:	Hao Ge <hao.ge@linux.dev>
-L:	linux-mm@kvack.org
-S:	Maintained
-F:	Documentation/mm/allocation-profiling.rst
-F:	include/linux/alloc_tag.h
-F:	include/linux/pgalloc_tag.h
-F:	lib/alloc_tag.c
-
 MEMORY CONTROLLER DRIVERS
 M:	Krzysztof Kozlowski <krzk@kernel.org>
 L:	linux-kernel@vger.kernel.org
@@ -16941,6 +16931,16 @@ T:	quilt git://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new
 F:	mm/
 F:	tools/mm/
 
+MEMORY MANAGEMENT - ALLOCATION PROFILING (ALLOC TAG)
+M:	Suren Baghdasaryan <surenb@google.com>
+R:	Hao Ge <hao.ge@linux.dev>
+L:	linux-mm@kvack.org
+S:	Maintained
+F:	Documentation/mm/allocation-profiling.rst
+F:	include/linux/alloc_tag.h
+F:	include/linux/pgalloc_tag.h
+F:	mm/alloc_tag.c
+
 MEMORY MANAGEMENT - BALLOON
 M:	Andrew Morton <akpm@linux-foundation.org>
 M:	David Hildenbrand <david@kernel.org>

lib/Kconfig.debug

@@ -1048,34 +1048,6 @@ config CODE_TAGGING
 	bool
 	select KALLSYMS
 
-config MEM_ALLOC_PROFILING
-	bool "Enable memory allocation profiling"
-	default n
-	depends on MMU
-	depends on PROC_FS
-	depends on !DEBUG_FORCE_WEAK_PER_CPU
-	select CODE_TAGGING
-	select PAGE_EXTENSION
-	select SLAB_OBJ_EXT
-	help
-	  Track allocation source code and record total allocation size
-	  initiated at that code location. The mechanism can be used to track
-	  memory leaks with a low performance and memory impact.
-
-config MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
-	bool "Enable memory allocation profiling by default"
-	default y
-	depends on MEM_ALLOC_PROFILING
-
-config MEM_ALLOC_PROFILING_DEBUG
-	bool "Memory allocation profiler debugging"
-	default n
-	depends on MEM_ALLOC_PROFILING
-	select MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
-	help
-	  Adds warnings with helpful error messages for memory allocation
-	  profiling.
-
 source "lib/Kconfig.kasan"
 source "lib/Kconfig.kfence"
 source "lib/Kconfig.kmsan"

lib/Makefile

@@ -196,7 +196,6 @@ obj-$(CONFIG_OF_RECONFIG_NOTIFIER_ERROR_INJECT) += \
 obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
 
 obj-$(CONFIG_CODE_TAGGING) += codetag.o
-obj-$(CONFIG_MEM_ALLOC_PROFILING) += alloc_tag.o
 
 lib-$(CONFIG_GENERIC_BUG) += bug.o
 

mm/Kconfig.debug

@@ -320,3 +320,31 @@ config PER_VMA_LOCK_STATS
 	  overhead in the page fault path.
 
 	  If in doubt, say N.
+
+config MEM_ALLOC_PROFILING
+	bool "Enable memory allocation profiling"
+	default n
+	depends on MMU
+	depends on PROC_FS
+	depends on !DEBUG_FORCE_WEAK_PER_CPU
+	select CODE_TAGGING
+	select PAGE_EXTENSION
+	select SLAB_OBJ_EXT
+	help
+	  Track allocation source code and record total allocation size
+	  initiated at that code location. The mechanism can be used to track
+	  memory leaks with a low performance and memory impact.
+
+config MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
+	bool "Enable memory allocation profiling by default"
+	default y
+	depends on MEM_ALLOC_PROFILING
+
+config MEM_ALLOC_PROFILING_DEBUG
+	bool "Memory allocation profiler debugging"
+	default n
+	depends on MEM_ALLOC_PROFILING
+	select MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
+	help
+	  Adds warnings with helpful error messages for memory allocation
+	  profiling.

mm/Makefile

@@ -147,3 +147,4 @@ obj-$(CONFIG_SHRINKER_DEBUG) += shrinker_debug.o
 obj-$(CONFIG_EXECMEM) += execmem.o
 obj-$(CONFIG_TMPFS_QUOTA) += shmem_quota.o
 obj-$(CONFIG_LAZY_MMU_MODE_KUNIT_TEST) += tests/lazy_mmu_mode_kunit.o
+obj-$(CONFIG_MEM_ALLOC_PROFILING) += alloc_tag.o