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| author | Daniel De Graaf <dgdegra@tycho.nsa.gov> | 2011-10-19 17:59:37 -0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-11-09 09:15:28 -0500 |
| commit | d9263f978f03a4b936d8cc69dd7835d635bdb578 (patch) | |
| tree | c6c4d19a13a5a5b7d9bbf7faba84d6b656bd4aaa | |
| parent | d70796521aaf9afabe64b0d80d448e45879ea699 (diff) | |
| download | xen-d9263f978f03a4b936d8cc69dd7835d635bdb578.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>
| -rw-r--r-- | drivers/xen/balloon.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index a767884a6c7a10..31ab82fda38a26 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; |