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Howlett" To: Lorenzo Stoakes Cc: Andrew Morton , Suren Baghdasaryan , Vlastimil Babka , Shakeel Butt , David Hildenbrand , Rik van Riel , Harry Yoo , Jann Horn , Mike Rapoport , Michal Hocko , Pedro Falcato , Chris Li , Barry Song , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 2/8] mm/rmap: skip unfaulted VMAs on anon_vma clone, unlink Message-ID: Mail-Followup-To: "Liam R. 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source VMA or the > VMA to be linked are unfaulted (e.g. !vma->anon_vma), then the functions do > nothing. Simply exit early in these cases. > > In the unlink_anon_vmas() case we can also remove a conditional that checks > whether vma->anon_vma is set. > > Signed-off-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett > --- > mm/rmap.c | 22 +++++++++++++--------- > 1 file changed, 13 insertions(+), 9 deletions(-) > > diff --git a/mm/rmap.c b/mm/rmap.c > index 54ccf884d90a..de2cbe860566 100644 > --- a/mm/rmap.c > +++ b/mm/rmap.c > @@ -314,6 +314,9 @@ int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src) > > check_anon_vma_clone(dst, src); > > + if (!src->anon_vma) > + return 0; > + > list_for_each_entry_reverse(pavc, &src->anon_vma_chain, same_vma) { > struct anon_vma *anon_vma; > > @@ -474,7 +477,10 @@ void unlink_anon_vmas(struct vm_area_struct *vma) > mmap_assert_locked(vma->vm_mm); > > /* Unfaulted is a no-op. */ > - VM_WARN_ON_ONCE(!vma->anon_vma && !list_empty(&vma->anon_vma_chain)); > + if (!vma->anon_vma) { > + VM_WARN_ON_ONCE(!list_empty(&vma->anon_vma_chain)); > + return; > + } > > /* > * Unlink each anon_vma chained to the VMA. This list is ordered > @@ -498,15 +504,13 @@ void unlink_anon_vmas(struct vm_area_struct *vma) > list_del(&avc->same_vma); > anon_vma_chain_free(avc); > } > - if (vma->anon_vma) { > - vma->anon_vma->num_active_vmas--; > > - /* > - * vma would still be needed after unlink, and anon_vma will be prepared > - * when handle fault. > - */ > - vma->anon_vma = NULL; > - } > + vma->anon_vma->num_active_vmas--; > + /* > + * 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); > > /* > -- > 2.52.0 >