vmem_altmap_free() and vmem_altmap_offset() could be utlized without
CONFIG_ZONE_DEVICE enabled. Hence, move it to sparse-vmemmap.c

Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
---
 include/linux/memremap.h | 12 ------------
 include/linux/mm.h       |  2 ++
 mm/memremap.c            | 14 +-------------
 mm/sparse-vmemmap.c      | 13 +++++++++++++
 4 files changed, 16 insertions(+), 25 deletions(-)

diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 1314d9c5f05b..744c830f4b13 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -196,8 +196,6 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
 		struct dev_pagemap *pgmap);
 bool pgmap_pfn_valid(struct dev_pagemap *pgmap, unsigned long pfn);
 
-unsigned long vmem_altmap_offset(struct vmem_altmap *altmap);
-void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns);
 unsigned long memremap_compat_align(void);
 #else
 static inline void *devm_memremap_pages(struct device *dev,
@@ -228,16 +226,6 @@ static inline bool pgmap_pfn_valid(struct dev_pagemap *pgmap, unsigned long pfn)
 	return false;
 }
 
-static inline unsigned long vmem_altmap_offset(struct vmem_altmap *altmap)
-{
-	return 0;
-}
-
-static inline void vmem_altmap_free(struct vmem_altmap *altmap,
-		unsigned long nr_pfns)
-{
-}
-
 /* when memremap_pages() is disabled all archs can remap a single page */
 static inline unsigned long memremap_compat_align(void)
 {
diff --git a/include/linux/mm.h b/include/linux/mm.h
index bf5d0b1b16f4..5edb0dfd2d01 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3765,6 +3765,8 @@ pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node);
 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node,
 			    struct vmem_altmap *altmap, struct page *reuse);
+unsigned long vmem_altmap_offset(struct vmem_altmap *altmap);
+void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns);
 void *vmemmap_alloc_block(unsigned long size, int node);
 struct vmem_altmap;
 void *vmemmap_alloc_block_buf(unsigned long size, int node,
diff --git a/mm/memremap.c b/mm/memremap.c
index bee85560a243..9531faa92a7c 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -7,6 +7,7 @@
 #include <linux/memremap.h>
 #include <linux/pfn_t.h>
 #include <linux/swap.h>
+#include <linux/mm.h>
 #include <linux/mmzone.h>
 #include <linux/swapops.h>
 #include <linux/types.h>
@@ -422,19 +423,6 @@ void devm_memunmap_pages(struct device *dev, struct dev_pagemap *pgmap)
 }
 EXPORT_SYMBOL_GPL(devm_memunmap_pages);
 
-unsigned long vmem_altmap_offset(struct vmem_altmap *altmap)
-{
-	/* number of pfns from base where pfn_to_page() is valid */
-	if (altmap)
-		return altmap->reserve + altmap->free;
-	return 0;
-}
-
-void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns)
-{
-	altmap->alloc -= nr_pfns;
-}
-
 /**
  * get_dev_pagemap() - take a new live reference on the dev_pagemap for @pfn
  * @pfn: page frame number to lookup page_map
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index a2cbe44c48e1..bd1b9a137f93 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -46,6 +46,19 @@ static void * __ref __earlyonly_bootmem_alloc(int node,
 					       MEMBLOCK_ALLOC_ACCESSIBLE, node);
 }
 
+unsigned long vmem_altmap_offset(struct vmem_altmap *altmap)
+{
+	/* number of pfns from base where pfn_to_page() is valid */
+	if (altmap)
+		return altmap->reserve + altmap->free;
+	return 0;
+}
+
+void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns)
+{
+	altmap->alloc -= nr_pfns;
+}
+
 void * __meminit vmemmap_alloc_block(unsigned long size, int node)
 {
 	/* If the main allocator is up use that, fallback to bootmem. */
-- 
2.41.0

Hi Sumanth,

kernel test robot noticed the following build errors:

[auto build test ERROR on s390/features]
[also build test ERROR on kvms390/next linus/master v6.7-rc1]
[cannot apply to akpm-mm/mm-everything next-20231117]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sumanth-Korikkar/mm-memory_hotplug-fix-memory-hotplug-locking-order/20231115-035455
base:   https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features
patch link:    https://lore.kernel.org/r/20231114180238.1522782-4-sumanthk%40linux.ibm.com
patch subject: [PATCH 3/8] mm: use vmem_altmap code without CONFIG_ZONE_DEVICE
config: x86_64-buildonly-randconfig-002-20231118 (https://download.01.org/0day-ci/archive/20231118/202311180545.VeyRXEDq-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231118/202311180545.VeyRXEDq-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311180545.VeyRXEDq-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: arch/x86/mm/init_64.o: in function `remove_pagetable':
>> init_64.c:(.meminit.text+0xfc7): undefined reference to `vmem_altmap_free'
   ld: mm/memory_hotplug.o: in function `__add_pages':
>> memory_hotplug.c:(.ref.text+0xc01): undefined reference to `vmem_altmap_offset'

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

On 14.11.23 19:02, Sumanth Korikkar wrote:
> vmem_altmap_free() and vmem_altmap_offset() could be utlized without
> CONFIG_ZONE_DEVICE enabled. Hence, move it to sparse-vmemmap.c

Maybe give an example: For example mm/memory_hotplug.c:__add_pages() 
relies on that.

The altmap is no longer restricted to ZONE_DEVICE handling.

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Cheers,

David / dhildenb