[PATCH bpf-next 03/16] mm: Expose vmap_pages_range() to the rest of the kernel.

[Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>]

From: Alexei Starovoitov <ast@xxxxxxxxxx>

The next commit will introduce bpf_arena which is a sparsely populated shared
memory region between bpf program and user space process.
It will function similar to vmalloc()/vm_map_ram():
- get_vm_area()
- alloc_pages()
- vmap_pages_range()

Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
---
 include/linux/vmalloc.h | 2 ++
 mm/vmalloc.c            | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index c720be70c8dd..bafb87c69e3d 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -233,6 +233,8 @@ static inline bool is_vm_area_hugepages(const void *addr)
 
 #ifdef CONFIG_MMU
 void vunmap_range(unsigned long addr, unsigned long end);
+int vmap_pages_range(unsigned long addr, unsigned long end,
+		     pgprot_t prot, struct page **pages, unsigned int page_shift);
 static inline void set_vm_flush_reset_perms(void *addr)
 {
 	struct vm_struct *vm = find_vm_area(addr);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d12a17fc0c17..eae93d575d1b 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -625,8 +625,8 @@ int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
  * RETURNS:
  * 0 on success, -errno on failure.
  */
-static int vmap_pages_range(unsigned long addr, unsigned long end,
-		pgprot_t prot, struct page **pages, unsigned int page_shift)
+int vmap_pages_range(unsigned long addr, unsigned long end,
+		     pgprot_t prot, struct page **pages, unsigned int page_shift)
 {
 	int err;
 
-- 
2.34.1