linux-kernel - [PATCH] nommu: implement vmap/vunmap with kmalloc

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Message-Id: <1261413866-30634-1-git-send-email-vapier@gentoo.org>
Date:	Mon, 21 Dec 2009 11:44:26 -0500
From:	Mike Frysinger <vapier@...too.org>
To:	uclinux-dev@...inux.org, David Howells <dhowells@...hat.com>,
	David McCullough <davidm@...pgear.com>,
	Greg Ungerer <gerg@...inux.org>,
	Paul Mundt <lethal@...ux-sh.org>
Cc:	uclinux-dist-devel@...ckfin.uclinux.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] nommu: implement vmap/vunmap with kmalloc

git-svn-id: svn://localhost/svn/linux-kernel/trunk@...3 526b6c2d-f592-4532-a319-5dd88ccb003d
---
 mm/nommu.c |   18 +++++++++++++++---
 1 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/mm/nommu.c b/mm/nommu.c
index 8687973..d28ab94 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);
 
-- 
1.6.5.4

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