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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> | 2011-11-16 12:13:43 -0500 |
| commit | 72e9cf2ab12ef3e050577ffebdb0c88a28df821d (patch) | |
| tree | 8b514d680a2af0907705319f078d4f6ec89d03df /drivers/xen/balloon.c | |
| parent | 5f76d7078ce784916d55fc4e1bb0a42985f085a6 (diff) | |
| download | lwn-72e9cf2ab12ef3e050577ffebdb0c88a28df821d.tar.gz lwn-72e9cf2ab12ef3e050577ffebdb0c88a28df821d.zip | |
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/balloon.c')
| -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 a767884a6c7a..31ab82fda38a 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; |