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authorDaniel De Graaf <dgdegra@tycho.nsa.gov>2011-10-19 17:59:37 -0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-11-16 12:13:43 -0500
commit72e9cf2ab12ef3e050577ffebdb0c88a28df821d (patch)
tree8b514d680a2af0907705319f078d4f6ec89d03df /drivers/xen
parent5f76d7078ce784916d55fc4e1bb0a42985f085a6 (diff)
downloadop-kernel-dev-72e9cf2ab12ef3e050577ffebdb0c88a28df821d.zip
op-kernel-dev-72e9cf2ab12ef3e050577ffebdb0c88a28df821d.tar.gz
xen/balloon: Avoid OOM when requesting highmem
If highmem pages are requested from the balloon on a system without highmem, the implementation of alloc_xenballooned_pages will allocate all available memory trying to find highmem pages to return. Allow low memory to be returned when highmem pages are requested to avoid this loop. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/balloon.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index a767884..31ab82f 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -501,7 +501,7 @@ EXPORT_SYMBOL_GPL(balloon_set_new_target);
* alloc_xenballooned_pages - get pages that have been ballooned out
* @nr_pages: Number of pages to get
* @pages: pages returned
- * @highmem: highmem or lowmem pages
+ * @highmem: allow highmem pages
* @return 0 on success, error otherwise
*/
int alloc_xenballooned_pages(int nr_pages, struct page **pages, bool highmem)
@@ -511,7 +511,7 @@ int alloc_xenballooned_pages(int nr_pages, struct page **pages, bool highmem)
mutex_lock(&balloon_mutex);
while (pgno < nr_pages) {
page = balloon_retrieve(highmem);
- if (page && PageHighMem(page) == highmem) {
+ if (page && (highmem || !PageHighMem(page))) {
pages[pgno++] = page;
} else {
enum bp_state st;
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