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authorJeremy Fitzhardinge <jeremy@goop.org>2008-11-17 20:35:00 +0300
committerIngo Molnar <mingo@elte.hu>2008-11-17 21:11:26 +0300
commit26a3e99160cfb06a0a33e25b9fb0d516e2cc680d (patch)
tree83cec2de720c3ce23a612b4d1bf37c36bf28f0ec /drivers/xen
parentd3c6aa1e69f705ac3ab64584101b1d38435b1353 (diff)
downloadlinux-26a3e99160cfb06a0a33e25b9fb0d516e2cc680d.tar.xz
xen: fix scrub_page()
Impact: fix guest kernel crash with CONFIG_XEN_SCRUB_PAGES=y Jens noticed that scrub_page() has a buggy unmap of the wrong thing. (virtual address instead of page) Linus pointed out that the whole scrub_page() code is an unnecessary reimplementation of clear_highpage() to begin with. Just use clear_highpage() rather than reimplementing it poorly. Reported-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/balloon.c9
1 files changed, 1 insertions, 8 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index a0fb5eac407c..526c191e84ea 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -122,14 +122,7 @@ static struct timer_list balloon_timer;
static void scrub_page(struct page *page)
{
#ifdef CONFIG_XEN_SCRUB_PAGES
- if (PageHighMem(page)) {
- void *v = kmap(page);
- clear_page(v);
- kunmap(v);
- } else {
- void *v = page_address(page);
- clear_page(v);
- }
+ clear_highpage(page);
#endif
}