livepatch: Make livepatch dependent on !TRIM_UNUSED_KSYMS

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 <[email protected]> Acked-by: Josh Poimboeuf <[email protected]> Acked-by: Jessica Yu <[email protected]> Signed-off-by: Miroslav Benes <[email protected]> Signed-off-by: Jiri Kosina <[email protected]>
opendata26 · May 26, 2017 · 5720acf · 5720acf
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commit 5720acf
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diff --git a/kernel/livepatch/Kconfig b/kernel/livepatch/Kconfig
@@ -10,6 +10,7 @@ config LIVEPATCH
 	depends on SYSFS
 	depends on KALLSYMS_ALL
 	depends on HAVE_LIVEPATCH
+	depends on !TRIM_UNUSED_KSYMS
 	help
 	  Say Y here if you want to support kernel live patching.
 	  This option has no runtime impact until a kernel "patch"