Message ID | aace0fd2c2d4d8e92423f03dbde7c63e46d5e493.1668099845.git.yuxuan.luo@canonical.com |
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State | New |
Headers | show
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Series |
[SRU,Bionic,1/3] mm/rmap.c: don't reuse anon_vma if we just want a copy
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diff --git a/mm/rmap.c b/mm/rmap.c index 658f267235ed..89b62b6b2008 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -406,8 +406,15 @@ void unlink_anon_vmas(struct vm_area_struct *vma) list_del(&avc->same_vma); anon_vma_chain_free(avc); } - if (vma->anon_vma) + if (vma->anon_vma) { vma->anon_vma->degree--; + + /* + * vma would still be needed after unlink, and anon_vma will be prepared + * when handle fault. + */ + vma->anon_vma = NULL; + } unlock_anon_vma_root(root); /*