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Howlett" To: David Hildenbrand Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzbot+3511625422f7aa637f0d@syzkaller.appspotmail.com, stable@vger.kernel.org, Christoph Lameter Subject: Re: [PATCH v1] mm/mempolicy: fix migrate_to_node() assuming there is at least one VMA in a MM Message-ID: Mail-Followup-To: "Liam R. 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Hildenbrand [241122 04:32]: > On 22.11.24 07:19, Andrew Morton wrote: > > On Wed, 20 Nov 2024 15:27:46 -0500 "Liam R. Howlett" wrote: > > > > > I hate the extra check because syzbot can cause this as this should > > > basically never happen in real life, but it seems we have to add it. > > > > So.. > > > > --- a/mm/mempolicy.c~mm-mempolicy-fix-migrate_to_node-assuming-there-is-at-least-one-vma-in-a-mm-fix > > +++ a/mm/mempolicy.c > > @@ -1080,7 +1080,7 @@ static long migrate_to_node(struct mm_st > > mmap_read_lock(mm); > > vma = find_vma(mm, 0); > > - if (!vma) { > > + if (unlikely(!vma)) { > > mmap_read_unlock(mm); > > return 0; > > } > > _ > > > > ? > > Why not, at least for documentation purposes. Because I don't think this is > any fast-path we really care about, so expect the runtime effects to be > mostly negligible. Thanks! The next email we get about this will be a bot with a micro benchmark performance drop. Really though, I'm happy either way because of what David said. Thanks, Liam