livepatch: Make livepatch dependent on !TRIM_UNUSED_KSYMS

mirab · Jiri Kosina · commit 5720acf4bfc1 · 2017-05-27T00:27:37.000+02:00
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 &lt;mmarek@suse.com&gt;
Acked-by: Josh Poimboeuf &lt;jpoimboe@redhat.com&gt;
Acked-by: Jessica Yu &lt;jeyu@redhat.com&gt;
Signed-off-by: Miroslav Benes &lt;mbenes@suse.cz&gt;
Signed-off-by: Jiri Kosina &lt;jkosina@suse.cz&gt;
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"
