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From: Muchun Song Mime-Version: 1.0 (1.0) Subject: Re: [PATCH v7 0/6] mm: Fix vmemmap optimization accounting and initialization Date: Mon, 27 Apr 2026 09:50:18 +0800 Message-Id: References: <20260426125422.f9fa79ec47db2e552d75e29b@linux-foundation.org> Cc: Muchun Song , David Hildenbrand , Oscar Salvador , Michael Ellerman , Madhavan Srinivasan , Lorenzo Stoakes , Liam R Howlett , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Nicholas Piggin , Christophe Leroy , aneesh.kumar@linux.ibm.com, joao.m.martins@oracle.com, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org In-Reply-To: <20260426125422.f9fa79ec47db2e552d75e29b@linux-foundation.org> To: Andrew Morton X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 6902E100006 X-Stat-Signature: bbpqgzakw55cgf6e9exn68u5juggycyy X-Rspam-User: X-HE-Tag: 1777254661-916580 X-HE-Meta: U2FsdGVkX1/0UOfgYR/fL8HedpASVvx1lFl3PZNieVSglu6egRWTLRvPyx8EdCyUGMQT5BnaS61iVxRtlAWbHe/nVqZ9FgFeiZHrVV35+K6EKMGsQkIh417RdXff6hcIVS/3gZRPKmLERPs9M3jd0kKrEbbH4hKWYdJXDfscJwjhQ/72QajR9uzXeuUaQ4H+zVgYTakXVPOnM8rMN+caVFOjHr9ZKOQjnAJO95DssvIGGL5xBlNyJ4jnLitU3Wm3YCAFAWEu0R4HeCtKTKF3UBu4jNLHHYIUbKsZ/OhYjm7tKwERFwulGlgS3VOsVGdYJrXyiKQz/TOz0mfAagj3fIRh879kNHe9ZGdN9Higd16uhahNPBvwpPBXVVya18YCblblUrDUYZzDc9zx5r1YvywIQdVlIQ+5RwuVbwHgjinlWo9cmH4topboi1O+Cczn7Tsn4GZkdgzH12fafHxLc4fZ1d9+WkRhvQrCyJvE6tq3tmZxfxfz9SLB0VGqe5N5utN2kK0/YesN+FqWhnbtjOtxIugZ6Dzb1IC16r8esCGXmkn3vyrE74W2cKtW9Nlsn3Ve8T/aGseGAFgWlo77slaSyzn+1h1Xn5ADUcoL+rymsGFMGH6H0WeqihgLfI9jSjroldVquRzCW1vJ4jYhqnqSVZyWX02igi7bES0iPKom6kTDgAsXVfIwj5ocxVW2QCW8YT6BuAGpMway8zvALHrCqHGDjbmSmKcEA7SqHELjc841aT2GIMHGDUx8yZ1RDCVVc+Tin5kb4Vk7pfD0oSNWlNdcxOh9QiZE7wmSo2h337KXH1egrY5uenkFHXVEDV1kwecy0lYADAJH5NyYqePJujudpExgsSNCMeH0jjnfiD3rQXZmd1v73wpBn0h5NWzQG1pDmtoCnJqn5IeJE6PK4uVYwP4gQEeHrZR+a63j2ypmKpMdZ17FWd+1cyyFDRmgrtOFUbvP6EQR9Xb zJKLaWPK kddmLArO5CKfjHVBg31HbPvdTk01Hp0Xd7IlCYU5wEGFdgIHkuNpEgAtKRD2TX0TFS9COogChDdnXjwO2cRHFvRLb/owCbHg4xmcMGvFVLAEbLCgX9OkSUuhWShaLAsNR5PlJhqurQbQwWOOGUf7tPye844CYRNd54YZ2FxAyMPFDKlQA3MfADa+KG20kyERfV5HN+Chc7GriPtAXGOLiSGPpEYi4I05U1Ufvh2zGKvu2Gv3MFwd/bWkVIugR9ArowzvyGmXbO4FM6+eQ563LbRIJqYGkF+UbVte+FMELWobfx9/DExvKiIp3t9bvXptRfgWUCWISx+eFFeV/j9LrYgv9KomuJWPinp9XNqMQYNsCvkJTMpF3ZwjpPJ0waMM1FMV8cVnJlVG51bff3w7Son2KmK7lQMUx1oEISZmToDBjDsPAfKZm8PbL8hl1sd89Akv+80OaDG471GvtjoSfiMhdgz26LnpUSK+9Bbpg7bd0ZwQ28vQ5KB+quyr5pTFU5wR+ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --Apple-Mail-050A2CCA-0B25-444E-BA9B-12E28AE2505E Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable > On Apr 27, 2026, at 03:54, Andrew Morton wrote= : >=20 > =EF=BB=BFOn Sun, 26 Apr 2026 17:26:34 +0800 Muchun Song wrote: >=20 >> The series fixes several bugs in vmemmap optimization, mainly around >> incorrect page accounting and memmap initialization in DAX and memory >> hotplug paths. It also fixes pageblock migratetype initialization and >> struct page initialization for ZONE_DEVICE compound pages. >=20 > Thanks. I'm assuming that none of this is urgent, so there's no need > to fast-track any of these fixes into 7.1-rcX? Not urgent. >=20 > So the cc:stable patches will be offered to -stable maintainers after > 7.2-rc1 is released? No problem. >=20 > Sashiko might have found another bug in there btw > https://sashiko.dev/#/patchset/20260426092640.375967-1-songmuchun@byted= ance.com I see. it=E2=80=99s a real issue, but not introduced by this series. I=E2=80=99ve sent a separate series to fix this issue. See https://lore.kernel.org/linux-mm/20260426144447.817722-1-songmuchun@byte= dance.com/ Thanks.= --Apple-Mail-050A2CCA-0B25-444E-BA9B-12E28AE2505E Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable

On Apr 27, 2026, at 03:54, Andrew Morton <akp= m@linux-foundation.org> wrote:

=EF=BB=BFOn Sun, 26 Apr 2026 17:26:34 +0800= Muchun Song <songmuchun@bytedance.com> wrote:
=
The series fixes several bugs in vmemmap= optimization, mainly around
incorrect page accounting and memmap initialization in DAX and memor= y
hotplug paths. It a= lso fixes pageblock migratetype initialization and
struct page initialization for ZONE_DEVICE com= pound pages.

Thanks.  I'm= assuming that none of this is urgent, so there's no need
to= fast-track any of these fixes into 7.1-rcX?

Not urgent.


So the cc:stable patches will be offered to -st= able maintainers after
7.2-rc1 is released?
=

No problem.


Sashiko might have found another= bug in there btw
   https://sashiko.dev/#/patchs= et/20260426092640.375967-1-songmuchun@bytedance.com

I see. it=E2=80=99s a real issue, but not introduced by this s= eries.
I=E2=80=99ve sent a separate series to fix this issue.


Thanks.
= --Apple-Mail-050A2CCA-0B25-444E-BA9B-12E28AE2505E--