From: Julien Grall <julien.grall@linaro.org>
Date: Fri, 10 May 2013 16:22:16 +0000 (+0100)
Subject: xen/mm: Align virtual address on PAGE_SIZE in iounmap
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~6852
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/success/%22http:/www.example.com/cgi/success?a=commitdiff_plain;h=73a6a932d6e927c4608a8726987a3e89545d7bee;p=xen.git

xen/mm: Align virtual address on PAGE_SIZE in iounmap

ioremap function can unlikely return an unaligned virtual address if
the physical address itself is unaligned on a page size.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
[ ijc -- include asm/page.h to fix build error on x86 ]
---

diff --git a/xen/include/xen/vmap.h b/xen/include/xen/vmap.h
index 88e5d997a0..b1923dd221 100644
--- a/xen/include/xen/vmap.h
+++ b/xen/include/xen/vmap.h
@@ -2,6 +2,7 @@
 #define __XEN_VMAP_H__
 
 #include <xen/types.h>
+#include <asm/page.h>
 
 void *vm_alloc(unsigned int nr, unsigned int align);
 void vm_free(const void *);
@@ -15,7 +16,9 @@ void __iomem *ioremap(paddr_t, size_t);
 
 static inline void iounmap(void __iomem *va)
 {
-    vunmap((void __force *)va);
+    unsigned long addr = (unsigned long)(void __force *)va;
+
+    vunmap((void *)(addr & PAGE_MASK));
 }
 
 void vm_init(void);