On 9/1/20 3:46 AM, Wei Yang wrote: > The page allocated from buddy is not on any list, so just use list_add() > is enough. > > Signed-off-by: Wei Yang <richard.weiy...@linux.alibaba.com> > Reviewed-by: Baoquan He <b...@redhat.com> > Reviewed-by: Mike Kravetz <mike.krav...@oracle.com> > --- > mm/hugetlb.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index 441b7f7c623e..c9b292e664c4 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -2405,7 +2405,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, > h->resv_huge_pages--; > } > spin_lock(&hugetlb_lock); > - list_move(&page->lru, &h->hugepage_activelist); > + list_add(&page->lru, &h->hugepage_activelist);
Hmm, how does that list_move() actually not crash today? Page has been taken from free lists, thus there was list_del() and page->lru should be poisoned. list_move() does __list_del_entry() which will either detect the poison with CONFIG_DEBUG_LIST, or crash accessing the poison, no? Am I missing something or does it mean this code is actually never executed in wild? > /* Fall through */ Maybe delete this comment? This is not a switch statement. > } > hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page); >
