From: Michael Kelley <mhklinux@xxxxxxxxxxx>
The mm subsystem currently provides no mechanism to map memory pages
to a specified virtual address range. A virtual address range can be
allocated using get_vm_area(), but the only function available for
mapping memory pages to a caller-specified address in that range is
ioremap_page_range(), which is inappropriate for system memory.
Fix this by allowing vmap_pages_range() to be used by callers outside
of vmalloc.c.
Signed-off-by: Michael Kelley <mhklinux@xxxxxxxxxxx>
---
include/linux/vmalloc.h | 2 ++
mm/vmalloc.c | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index c720be70c8dd..ee12f5226a45 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..b2a72bd317c6 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -625,7 +625,7 @@ 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,
+int vmap_pages_range(unsigned long addr, unsigned long end,
pgprot_t prot, struct page **pages, unsigned int page_shift)
{
int err;
--
2.25.1
