linux-kernel - Re: [PATCH gmem FIXUP v2] mm, compaction: make testing mapping

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Date:   Fri,  8 Sep 2023 17:15:33 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>
Cc:     ackerleytng@...gle.com, akpm@...ux-foundation.org,
        anup@...infault.org, aou@...s.berkeley.edu,
        chao.p.peng@...ux.intel.com, chenhuacai@...nel.org,
        david@...hat.com, isaku.yamahata@...il.com, jarkko@...nel.org,
        jmorris@...ei.org, kirill.shutemov@...ux.intel.com,
        kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org,
        kvmarm@...ts.linux.dev, liam.merwick@...cle.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-mm@...ck.org,
        linux-riscv@...ts.infradead.org,
        linux-security-module@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, mail@...iej.szmigiero.name,
        maz@...nel.org, michael.roth@....com, mpe@...erman.id.au,
        oliver.upton@...ux.dev, palmer@...belt.com,
        paul.walmsley@...ive.com, paul@...l-moore.com, pbonzini@...hat.com,
        qperret@...gle.com, serge@...lyn.com, tabba@...gle.com,
        vannapurve@...gle.com, wei.w.wang@...el.com, willy@...radead.org,
        yu.c.zhang@...ux.intel.com
Subject: Re: [PATCH gmem FIXUP v2] mm, compaction: make testing
 mapping_unmovable() safe

On Fri, 08 Sep 2023 09:42:23 +0200, Vlastimil Babka wrote:
> As Kirill pointed out, mapping can be removed under us due to
> truncation. Test it under folio lock as already done for the async
> compaction / dirty folio case. To prevent locking every folio with
> mapping to do the test, do it only for unevictable folios, as we can
> expect the unmovable mapping folios are also unevictable. To enforce
> that expecation, make mapping_set_unmovable() also set AS_UNEVICTABLE.
> 
> [...]

Applied to kvm-x86 guest_memfd, thanks!

[1/1] mm, compaction: make testing mapping_unmovable() safe
      https://github.com/kvm-x86/linux/commit/4876a35647b9

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes