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AJvYcCVLJH7+mfaoNVb9Pz72B3bw4ZTvdZ7d7766KTS6taJEfvzv9yzQoK5rIJj/UvaNbf2pk9IMIRMl3A==@kvack.org X-Gm-Message-State: AOJu0Yy/VkDDpbtZYmNdzckE160KZwZvhkIDPxoVAUOOvqLs9kOQa67Y Gb1o3Uwg8FZJkhM+ccNCMAeXo2WKBDH38cze+NlSKFUSUDLNEznvmNTVecBkzh6htCkx7gJxt/9 8An8+mf+4VVPN0DnqdhLPRoiLx7/ZLdHV+Ziw8Aa3Kw== X-Gm-Gg: AY/fxX7TU4pJvTsClpAI+TGeWzKr0n6G9okZcgi7CNIMWY/KZNXpamBVe0cPkviSmdi ZmnJYd4oqPcVNAAd0DpRwWEf3chcEzboEdXkxKlxIL9Cwkw+ry5vJhw6HjvSljWqA5jgnIN2vxG PJ7bt7lZV0FYggvDUMqxfsSh3+umztxqf8aYgVJiGp5Pb3cLa/xCQDby4funzIxUy2I1BlaxxSd RwjszD1kHiBmShUexWWPHgRPizCFV8k+JUVV5aNYDRfa+J+sAA1GERmdNf76unljNspzuqFRMIo to1dz8lGfukPXml5Df6v1c9B/Q== X-Google-Smtp-Source: AGHT+IGH8tzcQMQAXqKEaFFOZyLtvKw6Uyex9gXbMJAc6alcdCSjFh7LplB5DxZrvhLv5oQKg+KsitWx6VKYZ1DwKFM= X-Received: by 2002:a17:907:803:b0:b83:2c51:aebd with SMTP id a640c23a62f3a-b832c51d8b4mr1549186866b.19.1767110898203; Tue, 30 Dec 2025 08:08:18 -0800 (PST) MIME-Version: 1.0 References: <20251230145321.1512630-1-pasha.tatashin@soleen.com> In-Reply-To: From: Pasha Tatashin Date: Tue, 30 Dec 2025 11:07:41 -0500 X-Gm-Features: AQt7F2oD93nNDN3kLOZ5MUY6uCmx3RPfYz_XXSq3rst8F_oyqwo6uFtt1rCm5ZQ Message-ID: Subject: Re: [PATCH v2] liveupdate: separate memfd support into LIVEUPDATE_MEMFD To: Mike Rapoport Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pratyush@kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: C7A562000A X-Stat-Signature: h87au1bbwfzj3fr5piku5pzkf9bxzfbz X-Rspam-User: X-HE-Tag: 1767110899-569763 X-HE-Meta: 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 SIVS06Oj VsZND7Ejx5DshdQf/ANh2FIwX5SEJ2hsKploWnVy5Z+nCSaK4HtuaCPZXFafizDF62OkQGay2LAzVw8PsO+OBBnc4euNJ5s542+7+SQ1/j/sQU8h1iZoWlmohYVaAhvHvUhk3RYNGgg8aCeVxfGI1vH0Nv8CpzPQLaqVvMWfUMDE9Ht35+hboV4gOdmxBODEeXWXMwsq/QjM1tQGsljNbK93YfYpV95lBeflnLpfSYQYDAGBJ1eIjDhYyX53KdgNytlieGigiev9+hoWmb68lKhPwLYrKXefulyzBKqxp/UxO+4jUPYQgu9GV2FzhraADoeO1 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Dec 30, 2025 at 10:30=E2=80=AFAM Mike Rapoport wr= ote: > > On Tue, Dec 30, 2025 at 09:53:21AM -0500, Pasha Tatashin wrote: > > Decouple memfd preservation support from the core Live Update > > Orchestrator configuration. > > > > Previously, enabling CONFIG_LIVEUPDATE forced a dependency on > > CONFIG_SHMEM and unconditionally compiled memfd_luo.o. However, Live > > Update may be used for purposes that do not require memfd-backed memory > > preservation. > > > > Introduce CONFIG_LIVEUPDATE_MEMFD to gate memfd_luo.o. This moves the > > SHMEM and MEMFD_CREATE dependencies to the specific feature that needs > > them, allowing the base LIVEUPDATE option to be selected independently > > of shared memory support. > > > > Signed-off-by: Pasha Tatashin > > Reviewed-by: Pratyush Yadav > > --- > > Changes v2: > > - Updated testing config > > - Added review-by > > > > kernel/liveupdate/Kconfig | 16 +++++++++++++++- > > mm/Makefile | 2 +- > > tools/testing/selftests/liveupdate/config | 1 + > > 3 files changed, 17 insertions(+), 2 deletions(-) > > > > diff --git a/kernel/liveupdate/Kconfig b/kernel/liveupdate/Kconfig > > index d2aeaf13c3ac..9a1a8cdcf16c 100644 > > --- a/kernel/liveupdate/Kconfig > > +++ b/kernel/liveupdate/Kconfig > > @@ -54,7 +54,6 @@ config KEXEC_HANDOVER_ENABLE_DEFAULT > > config LIVEUPDATE > > bool "Live Update Orchestrator" > > depends on KEXEC_HANDOVER > > - depends on SHMEM > > help > > Enable the Live Update Orchestrator. Live Update is a mechanism= , > > typically based on kexec, that allows the kernel to be updated > > @@ -73,4 +72,19 @@ config LIVEUPDATE > > > > If unsure, say N. > > > > +config LIVEUPDATE_MEMFD > > + bool "Live update support for memfd" > > + depends on LIVEUPDATE > > + depends on MEMFD_CREATE > > + depends on SHMEM > > Maybe also > > default LIVEUPDATE Yeah, I like this idea, let me make the change, and send v3. Pasha