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601cc399a0
The new memfd code fails to link without SHMEM:
aarch64-linux-ld: mm/memfd_luo.o: in function `memfd_luo_retrieve_folios':
memfd_luo.c:(.text.memfd_luo_retrieve_folios+0xdc): undefined reference to `shmem_add_to_page_cache'
memfd_luo.c:(.text.memfd_luo_retrieve_folios+0x11c): undefined reference to `shmem_inode_acct_blocks'
memfd_luo.c:(.text.memfd_luo_retrieve_folios+0x134): undefined reference to `shmem_recalc_inode'
Add a Kconfig dependency to disallow that configuration.
Link: https://lkml.kernel.org/r/20251204100203.1034394-1-arnd@kernel.org
Fixes: b3749f174d ("mm: memfd_luo: allow preserving memfd")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
77 lines
2.5 KiB
Plaintext
77 lines
2.5 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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menu "Live Update and Kexec HandOver"
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depends on !DEFERRED_STRUCT_PAGE_INIT
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config KEXEC_HANDOVER
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bool "kexec handover"
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depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE
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depends on !DEFERRED_STRUCT_PAGE_INIT
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select MEMBLOCK_KHO_SCRATCH
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select KEXEC_FILE
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select LIBFDT
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select CMA
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help
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Allow kexec to hand over state across kernels by generating and
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passing additional metadata to the target kernel. This is useful
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to keep data or state alive across the kexec. For this to work,
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both source and target kernels need to have this option enabled.
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config KEXEC_HANDOVER_DEBUG
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bool "Enable Kexec Handover debug checks"
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depends on KEXEC_HANDOVER
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help
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This option enables extra sanity checks for the Kexec Handover
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subsystem. Since, KHO performance is crucial in live update
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scenarios and the extra code might be adding overhead it is
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only optionally enabled.
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config KEXEC_HANDOVER_DEBUGFS
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bool "kexec handover debugfs interface"
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default KEXEC_HANDOVER
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depends on KEXEC_HANDOVER
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select DEBUG_FS
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help
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Allow to control kexec handover device tree via debugfs
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interface, i.e. finalize the state or aborting the finalization.
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Also, enables inspecting the KHO fdt trees with the debugfs binary
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blobs.
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config KEXEC_HANDOVER_ENABLE_DEFAULT
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bool "Enable kexec handover by default"
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depends on KEXEC_HANDOVER
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help
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Enable Kexec Handover by default. This avoids the need to
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explicitly pass 'kho=on' on the kernel command line.
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This is useful for systems where KHO is a prerequisite for other
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features, such as Live Update, ensuring the mechanism is always
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active.
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The default behavior can still be overridden at boot time by
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passing 'kho=off'.
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config LIVEUPDATE
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bool "Live Update Orchestrator"
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depends on KEXEC_HANDOVER
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depends on SHMEM
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help
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Enable the Live Update Orchestrator. Live Update is a mechanism,
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typically based on kexec, that allows the kernel to be updated
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while keeping selected devices operational across the transition.
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These devices are intended to be reclaimed by the new kernel and
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re-attached to their original workload without requiring a device
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reset.
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Ability to handover a device from current to the next kernel depends
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on specific support within device drivers and related kernel
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subsystems.
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This feature primarily targets virtual machine hosts to quickly update
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the kernel hypervisor with minimal disruption to the running virtual
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machines.
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If unsure, say N.
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endmenu
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