[PATCH v2] NOMMU: implement vmap/vunmap with kmalloc

[Mike Frysinger <vapier@gentoo.org>]

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
v2
	- fix up changelog

 mm/nommu.c |   18 +++++++++++++++---
 1 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/mm/nommu.c b/mm/nommu.c
index b9b5cce..61a68d5 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -360,14 +360,26 @@ EXPORT_SYMBOL(vmalloc_32_user);
 
 void *vmap(struct page **pages, unsigned int count, unsigned long flags, pgprot_t prot)
 {
-	BUG();
-	return NULL;
+	unsigned int i;
+	void *new_map, *page_data;
+
+	new_map = kmalloc(count << PAGE_SHIFT, GFP_KERNEL);
+	if (!new_map)
+		return NULL;
+
+	for (i = 0; i < count; ++i) {
+		page_data = kmap(pages[i]);
+		memcpy(new_map + (i << PAGE_SHIFT), page_data, PAGE_SIZE);
+		kunmap(page_data);
+	}
+
+	return new_map;
 }
 EXPORT_SYMBOL(vmap);
 
 void vunmap(const void *addr)
 {
-	BUG();
+	kfree(addr);
 }
 EXPORT_SYMBOL(vunmap);
 
-- 
1.7.0.2