Re: [PATCH gmem FIXUP v2] mm, compaction: make testing mapping_unmovable() safe
From: Sean Christopherson <seanjc@google.com>
Date: 2023-09-09 00:16:03
Also in:
kvm, kvm-riscv, kvmarm, linux-fsdevel, linux-mips, linux-mm, linux-riscv, linux-security-module, linuxppc-dev, lkml
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
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https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes
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