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| author |   Joonsoo Kim <iamjoonsoo.kim@lge.com> | 2013-09-11 14:21:51 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:57:42 -0700 |
| commit | 4ef91848043679b272a1a5b8e2879acf696ba9e2 (patch) | |
| tree | c3b84c11107f2a3885721edcee54fe6fdce07ba7 /mm/hugetlb.c | |
| parent | mm/hotplug: remove stop_machine() from try_offline_node() (diff) | |
| download | linux-dev-4ef91848043679b272a1a5b8e2879acf696ba9e2.tar.xz linux-dev-4ef91848043679b272a1a5b8e2879acf696ba9e2.zip | |
mm, hugetlb: protect reserved pages when soft offlining a hugepage
Don't use the reserve pool when soft offlining a hugepage. Check we have
free pages outside the reserve pool before we dequeue the huge page.
Otherwise, we can steal other's reserve page.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 5b084c7b34c6..583db1948145 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -955,10 +955,11 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid) */ struct page *alloc_huge_page_node(struct hstate *h, int nid) { - struct page *page; + struct page *page = NULL; spin_lock(&hugetlb_lock); - page = dequeue_huge_page_node(h, nid); + if (h->free_huge_pages - h->resv_huge_pages > 0) + page = dequeue_huge_page_node(h, nid); spin_unlock(&hugetlb_lock); if (!page) |