mm: move vmalloc_init() declaration to mm/internal.h

vmalloc_init() is called only from mm_core_init(), there is no need to
declare it in include/linux/vmalloc.h

Move vmalloc_init() declaration to mm/internal.h

Link: https://lkml.kernel.org/r/20230321170513.2401534-14-rppt@kernel.orgSigned-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Doug Berger <opendmb@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/vmalloc.h

@@ -131,12 +131,8 @@ extern void *vm_map_ram(struct page **pages, unsigned int count, int node);
 extern void vm_unmap_aliases(void);
 
 #ifdef CONFIG_MMU
-extern void __init vmalloc_init(void);
 extern unsigned long vmalloc_nr_pages(void);
 #else
-static inline void vmalloc_init(void)
-{
-}
 static inline unsigned long vmalloc_nr_pages(void) { return 0; }
 #endif
 

mm/internal.h

@@ -879,9 +879,14 @@ size_t splice_folio_into_pipe(struct pipe_inode_info *pipe,
  * mm/vmalloc.c
  */
 #ifdef CONFIG_MMU
+void __init vmalloc_init(void);
 int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
                 pgprot_t prot, struct page **pages, unsigned int page_shift);
 #else
+static inline void vmalloc_init(void)
+{
+}
+
 static inline
 int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
                 pgprot_t prot, struct page **pages, unsigned int page_shift)