From: Peng Liu liupeng256@huawei.com
mainline inclusion from mainline-v5.19-rc1 commit 0a7a0f6f7f3679c906fc55e3805c1d5e2c566f55 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I6OWV4 CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Patch series "hugetlb: Fix some incorrect behavior", v3.
This series fix three bugs of hugetlb: 1) Invalid use of nr_online_nodes; 2) Inconsistency between 1G hugepage and 2M hugepage; 3) Useless information in dmesg.
This patch (of 4):
Certain systems are designed to have sparse/discontiguous nodes. In this case, nr_online_nodes can not be used to walk through numa node. Also, a valid node may be greater than nr_online_nodes.
However, in hugetlb, it is assumed that nodes are contiguous.
For sparse/discontiguous nodes, the current code may treat a valid node as invalid, and will fail to allocate all hugepages on a valid node that "nid >= nr_online_nodes".
As David suggested:
if (tmp >= nr_online_nodes) goto invalid;
Just imagine node 0 and node 2 are online, and node 1 is offline. Assuming that "node < 2" is valid is wrong.
Recheck all the places that use nr_online_nodes, and repair them one by one.
[liupeng256@huawei.com: v4] Link: https://lkml.kernel.org/r/20220416103526.3287348-1-liupeng256@huawei.com Link: https://lkml.kernel.org/r/20220413032915.251254-1-liupeng256@huawei.com Link: https://lkml.kernel.org/r/20220413032915.251254-2-liupeng256@huawei.com Fixes: 4178158ef8ca ("hugetlbfs: fix issue of preallocation of gigantic pages can't work") Fixes: b5389086ad7b ("hugetlbfs: extend the definition of hugepages parameter to support node allocation") Fixes: e79ce9832316 ("hugetlbfs: fix a truncation issue in hugepages parameter") Fixes: f9317f77a6e0 ("hugetlb: clean up potential spectre issue warnings") Signed-off-by: Peng Liu liupeng256@huawei.com Suggested-by: David Hildenbrand david@redhat.com Reviewed-by: Baolin Wang baolin.wang@linux.alibaba.com Reviewed-by: Kefeng Wang wangkefeng.wang@huawei.com Reviewed-by: Davidlohr Bueso dave@stgolabs.net Reviewed-by: Mike Kravetz mike.kravetz@oracle.com Acked-by: David Hildenbrand david@redhat.com Cc: Zhenguo Yao yaozhenguo1@gmail.com Cc: Muchun Song songmuchun@bytedance.com Cc: Liu Yuntao liuyuntao10@huawei.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Conflicts: mm/hugetlb.c Signed-off-by: Liu Shixin liushixin2@huawei.com --- mm/hugetlb.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 0f211d12de33..107ee82d6f24 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2727,9 +2727,6 @@ int __alloc_bootmem_huge_page(struct hstate *h, int nid) struct huge_bootmem_page *m = NULL; /* initialize for clang */ int nr_nodes, node;
- if (nid != NUMA_NO_NODE && nid >= nr_online_nodes) - return 0; - if (!huge_page_limit_check(HUGE_PAGE_BOOTMEM_ALLOC, huge_page_size(h), nid)) return 0;
@@ -2840,7 +2837,7 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h) }
/* do node specific alloc */ - for (i = 0; i < nr_online_nodes; i++) { + for_each_online_node(i) { if (h->max_huge_pages_node[i] > 0) { hugetlb_hstate_alloc_pages_onenode(h, i); node_specific_alloc = true; @@ -3577,7 +3574,7 @@ static int __init hugetlb_init(void) default_hstate.max_huge_pages = default_hstate_max_huge_pages;
- for (i = 0; i < nr_online_nodes; i++) + for_each_online_node(i) default_hstate.max_huge_pages_node[i] = default_hugepages_in_node[i]; } @@ -3696,7 +3693,7 @@ static int __init hugepages_setup(char *s) pr_warn("HugeTLB: architecture can't support node specific alloc, ignoring!\n"); return 0; } - if (tmp >= nr_online_nodes) + if (tmp >= MAX_NUMNODES || !node_online(tmp)) goto invalid; node = tmp; p += count + 1; @@ -3826,7 +3823,7 @@ static int __init default_hugepagesz_setup(char *s) */ if (default_hstate_max_huge_pages) { default_hstate.max_huge_pages = default_hstate_max_huge_pages; - for (i = 0; i < nr_online_nodes; i++) + for_each_online_node(i) default_hstate.max_huge_pages_node[i] = default_hugepages_in_node[i]; if (hstate_is_gigantic(&default_hstate))