From: Peng Liu liupeng256@huawei.com
mainline inclusion from mainline-v5.19-rc1 commit f87442f407af80dac4dc81c8a7772b71b36b2e09 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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Hugepages can be specified to pernode since "hugetlbfs: extend the definition of hugepages parameter to support node allocation", but the following problem is observed.
Confusing behavior is observed when both 1G and 2M hugepage is set after "numa=off". cmdline hugepage settings: hugepagesz=1G hugepages=0:3,1:3 hugepagesz=2M hugepages=0:1024,1:1024 results: HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages HugeTLB registered 2.00 MiB page size, pre-allocated 1024 pages
Furthermore, confusing behavior can be also observed when an invalid node behind a valid node. To fix this, never allocate any typical hugepage when an invalid parameter is received.
Link: https://lkml.kernel.org/r/20220413032915.251254-3-liupeng256@huawei.com Fixes: b5389086ad7b ("hugetlbfs: extend the definition of hugepages parameter to support node allocation") Signed-off-by: Peng Liu liupeng256@huawei.com Reviewed-by: Mike Kravetz mike.kravetz@oracle.com Cc: Baolin Wang baolin.wang@linux.alibaba.com Cc: David Hildenbrand david@redhat.com Cc: Liu Yuntao liuyuntao10@huawei.com Cc: Muchun Song songmuchun@bytedance.com Cc: Zhenguo Yao yaozhenguo1@gmail.com Cc: Kefeng Wang wangkefeng.wang@huawei.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Liu Shixin liushixin2@huawei.com --- mm/hugetlb.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 107ee82d6f24..1f641afc0756 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3645,6 +3645,20 @@ bool __init __weak hugetlb_node_alloc_supported(void) { return true; } + +static void __init hugepages_clear_pages_in_node(void) +{ + if (!hugetlb_max_hstate) { + default_hstate_max_huge_pages = 0; + memset(default_hugepages_in_node, 0, + MAX_NUMNODES * sizeof(unsigned int)); + } else { + parsed_hstate->max_huge_pages = 0; + memset(parsed_hstate->max_huge_pages_node, 0, + MAX_NUMNODES * sizeof(unsigned int)); + } +} + /* * hugepages command line processing * hugepages normally follows a valid hugepagsz or default_hugepagsz @@ -3732,6 +3746,7 @@ static int __init hugepages_setup(char *s)
invalid: pr_warn("HugeTLB: Invalid hugepages parameter %s\n", p); + hugepages_clear_pages_in_node(); return 0; } __setup("hugepages=", hugepages_setup);