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If TRIM_UNUSED_KSYMS is enabled, all unneeded exported symbols are made unexported. Two-pass build of the kernel is done to find out which symbols are needed based on a configuration. This effectively complicates things for out-of-tree modules. Livepatch exports functions to (un)register and enable/disable a live patch. The only in-tree module which uses these functions is a sample in samples/livepatch/. If the sample is disabled, the functions are trimmed and out-of-tree live patches cannot be built. Note that live patches are intended to be built out-of-tree. Suggested-by: Michal Marek <mmarek@suse.com> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Jessica Yu <jeyu@redhat.com> Signed-off-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
19 lines
586 B
Text
19 lines
586 B
Text
config HAVE_LIVEPATCH
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bool
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help
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Arch supports kernel live patching
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config LIVEPATCH
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bool "Kernel Live Patching"
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depends on DYNAMIC_FTRACE_WITH_REGS
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depends on MODULES
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depends on SYSFS
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depends on KALLSYMS_ALL
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depends on HAVE_LIVEPATCH
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depends on !TRIM_UNUSED_KSYMS
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help
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Say Y here if you want to support kernel live patching.
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This option has no runtime impact until a kernel "patch"
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module uses the interface provided by this option to register
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a patch, causing calls to patched functions to be redirected
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to new function code contained in the patch module.
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