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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-11-17 09:35:00 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-17 19:11:26 +0100 |
| commit | 26a3e99160cfb06a0a33e25b9fb0d516e2cc680d (patch) | |
| tree | 83cec2de720c3ce23a612b4d1bf37c36bf28f0ec /drivers/xen | |
| parent | d3c6aa1e69f705ac3ab64584101b1d38435b1353 (diff) | |
| download | lwn-26a3e99160cfb06a0a33e25b9fb0d516e2cc680d.tar.gz lwn-26a3e99160cfb06a0a33e25b9fb0d516e2cc680d.zip | |
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.c | 9 |
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 } |