[PATCH v2 2/3] mm: split out sparse declarations from internal.h

["Mike Rapoport (Microsoft)" <rppt@kernel.org>]

mm/internal.h becomes more and more bloated.

Move declarations related to SPARSE and SPARSE_VMEMMAP memory models to
a new mm/sparse.h header.

No functional changes.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Muchun Song <muchun.song@linux.dev>
---
 MAINTAINERS         |  1 +
 mm/internal.h       | 52 -------------------------------------------
 mm/mm_init.c        |  1 +
 mm/sparse-vmemmap.c |  1 +
 mm/sparse.c         |  1 +
 mm/sparse.h         | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 67 insertions(+), 52 deletions(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 33cef4d8e1ee..5c1aed067656 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16999,6 +16999,7 @@ F:	mm/pgtable-generic.c
 F:	mm/ptdump.c
 F:	mm/sparse-vmemmap.c
 F:	mm/sparse.c
+F:	mm/sparse.h
 F:	mm/util.c
 F:	mm/vmpressure.c
 F:	mm/vmstat.c
diff --git a/mm/internal.h b/mm/internal.h
index 59adb140fc7a..a29a7dab2e6c 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -807,58 +807,6 @@ static inline void init_compound_tail(struct page *tail,
 	prep_compound_tail(tail, head, order);
 }
 
-/*
- * mm/sparse.c
- */
-#ifdef CONFIG_SPARSEMEM
-void sparse_init(void);
-int sparse_index_init(unsigned long section_nr, int nid);
-
-static inline void sparse_init_one_section(struct mem_section *ms,
-		unsigned long pnum, struct page *mem_map,
-		struct mem_section_usage *usage, unsigned long flags)
-{
-	unsigned long coded_mem_map;
-
-	BUILD_BUG_ON(SECTION_MAP_LAST_BIT > PFN_SECTION_SHIFT);
-
-	/*
-	 * We encode the start PFN of the section into the mem_map such that
-	 * page_to_pfn() on !CONFIG_SPARSEMEM_VMEMMAP can simply subtract it
-	 * from the page pointer to obtain the PFN.
-	 */
-	coded_mem_map = (unsigned long)(mem_map - section_nr_to_pfn(pnum));
-	VM_WARN_ON_ONCE(coded_mem_map & ~SECTION_MAP_MASK);
-
-	ms->section_mem_map &= ~SECTION_MAP_MASK;
-	ms->section_mem_map |= coded_mem_map;
-	ms->section_mem_map |= flags | SECTION_HAS_MEM_MAP;
-	ms->usage = usage;
-}
-
-static inline void __section_mark_present(struct mem_section *ms,
-		unsigned long section_nr)
-{
-	if (section_nr > __highest_present_section_nr)
-		__highest_present_section_nr = section_nr;
-
-	ms->section_mem_map |= SECTION_MARKED_PRESENT;
-}
-#else
-static inline void sparse_init(void) {}
-#endif /* CONFIG_SPARSEMEM */
-
-/*
- * mm/sparse-vmemmap.c
- */
-#ifdef CONFIG_SPARSEMEM_VMEMMAP
-void sparse_init_subsection_map(void);
-#else
-static inline void sparse_init_subsection_map(void)
-{
-}
-#endif /* CONFIG_SPARSEMEM_VMEMMAP */
-
 #if defined CONFIG_COMPACTION || defined CONFIG_CMA
 
 /*
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 39583c028e34..b557e5fe35f3 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -35,6 +35,7 @@
 #include "internal.h"
 #include "mm_init.h"
 #include "page_alloc.h"
+#include "sparse.h"
 #include "slab.h"
 #include "shuffle.h"
 
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index 10dd4a9b591b..458b0b9570ff 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -42,6 +42,7 @@
 
 #include "internal.h"
 #include "mm_init.h"
+#include "sparse.h"
 
 /*
  * Allocate a block of memory to be used to back the virtual memory map
diff --git a/mm/sparse.c b/mm/sparse.c
index d54e30f58b93..704a9dec2b9a 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -16,6 +16,7 @@
 #include <linux/vmstat.h>
 #include "internal.h"
 #include "mm_init.h"
+#include "sparse.h"
 #include <asm/dma.h>
 
 /*
diff --git a/mm/sparse.h b/mm/sparse.h
new file mode 100644
index 000000000000..95aa031213f2
--- /dev/null
+++ b/mm/sparse.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * sparse.h:
+ *
+ * mm/ internal sparse and sparse-vmemmap declarations
+ */
+
+#ifndef __MM_SPARSE_H
+#define __MM_SPARSE_H
+
+#include <linux/mmzone.h>
+
+/*
+ * mm/sparse.c
+ */
+#ifdef CONFIG_SPARSEMEM
+void sparse_init(void);
+int sparse_index_init(unsigned long section_nr, int nid);
+
+static inline void sparse_init_one_section(struct mem_section *ms,
+		unsigned long pnum, struct page *mem_map,
+		struct mem_section_usage *usage, unsigned long flags)
+{
+	unsigned long coded_mem_map;
+
+	BUILD_BUG_ON(SECTION_MAP_LAST_BIT > PFN_SECTION_SHIFT);
+
+	/*
+	 * We encode the start PFN of the section into the mem_map such that
+	 * page_to_pfn() on !CONFIG_SPARSEMEM_VMEMMAP can simply subtract it
+	 * from the page pointer to obtain the PFN.
+	 */
+	coded_mem_map = (unsigned long)(mem_map - section_nr_to_pfn(pnum));
+	VM_WARN_ON_ONCE(coded_mem_map & ~SECTION_MAP_MASK);
+
+	ms->section_mem_map &= ~SECTION_MAP_MASK;
+	ms->section_mem_map |= coded_mem_map;
+	ms->section_mem_map |= flags | SECTION_HAS_MEM_MAP;
+	ms->usage = usage;
+}
+
+static inline void __section_mark_present(struct mem_section *ms,
+		unsigned long section_nr)
+{
+	if (section_nr > __highest_present_section_nr)
+		__highest_present_section_nr = section_nr;
+
+	ms->section_mem_map |= SECTION_MARKED_PRESENT;
+}
+#else
+static inline void sparse_init(void) {}
+#endif /* CONFIG_SPARSEMEM */
+
+/*
+ * mm/sparse-vmemmap.c
+ */
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+void sparse_init_subsection_map(void);
+#else
+static inline void sparse_init_subsection_map(void) {}
+#endif /* CONFIG_SPARSEMEM_VMEMMAP */
+
+#endif /* __MM_SPARSE_H */

-- 
2.53.0