From: Christoph Hellwig <hch@infradead.org>
To: mpenttil@redhat.com
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH v7 1/6] mm:/Kconfig changes for migrate on fault for device pages
Date: Sun, 29 Mar 2026 23:20:42 -0700 [thread overview]
Message-ID: <acoWOnZh1NpVerCR@infradead.org> (raw)
In-Reply-To: <20260330043017.251808-2-mpenttil@redhat.com>
On Mon, Mar 30, 2026 at 07:30:12AM +0300, mpenttil@redhat.com wrote:
> From: Mika Penttilä <mpenttil@redhat.com>
>
> With the unified HMM/migrate_device page table walk
> migrate_device needs HMM enabled and HMM needs
> MMU notifiers. Enable them explicitly to avoid
> breaking random configs.
You can use a lot more space in your commit logs, ending the lines so
early reads a bit weird.
> diff --git a/mm/Kconfig b/mm/Kconfig
> index ebd8ea353687..583d92bba2e8 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -647,6 +647,7 @@ config MIGRATION
>
> config DEVICE_MIGRATION
> def_bool MIGRATION && ZONE_DEVICE
> + select HMM_MIRROR
>
> config ARCH_ENABLE_HUGEPAGE_MIGRATION
> bool
> @@ -1222,6 +1223,7 @@ config ZONE_DEVICE
> config HMM_MIRROR
> bool
> depends on MMU
> + select MMU_NOTIFIER
But either way this really should go into the patch that actually adds
the code dependency anyway.
next prev parent reply other threads:[~2026-03-30 6:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-30 4:30 [PATCH v7 0/6] Migrate on fault for device pages mpenttil
2026-03-30 4:30 ` [PATCH v7 1/6] mm:/Kconfig changes for migrate " mpenttil
2026-03-30 6:20 ` Christoph Hellwig [this message]
2026-03-30 4:30 ` [PATCH v7 2/6] mm: Add helper to convert HMM pfn to migrate pfn mpenttil
2026-03-30 4:30 ` [PATCH v7 3/6] mm/hmm: do the plumbing for HMM to participate in migration mpenttil
2026-03-30 11:05 ` kernel test robot
2026-03-30 11:05 ` kernel test robot
2026-03-30 4:30 ` [PATCH v7 4/6] mm: setup device page migration in HMM pagewalk mpenttil
2026-03-30 4:30 ` [PATCH v7 5/6] mm: add new testcase for the migrate on fault case mpenttil
2026-03-30 6:21 ` Christoph Hellwig
2026-03-30 6:40 ` Mika Penttilä
2026-03-30 4:30 ` [PATCH v7 6/6] mm:/migrate_device.c: remove migrate_vma_collect_*() mpenttil
2026-03-30 6:22 ` Christoph Hellwig
2026-03-30 6:47 ` Mika Penttilä
-- strict thread matches above, loose matches on Subject: below --
2026-03-30 11:56 [RESEND PATCH v7 0/6] Migrate on fault for device pages mpenttil
2026-03-30 11:56 ` [PATCH v7 1/6] mm:/Kconfig changes for migrate " mpenttil
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