livepatch: samples: non static warnings fix

Sparse reported warnings about non-static symbols. For the variables
a simple static attribute is fine - for the functions referenced by
livepatch via klp_func the symbol-names must be unmodified in the
symbol table and the patchable code has to be emitted. The resolution
is to attach __used attribute to the shared statically declared functions.

Link: https://lore.kernel.org/lkml/1544965657-26804-1-git-send-email-hofrat@osadl.org/
Suggested-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 6 insertions, 5 deletions

diff --git a/samples/livepatch/livepatch-shadow-mod.c b/samples/livepatch/livepatch-shadow-mod.c
index 4aa8a88d3cd6..4d79c6dc055b 100644
--- a/samples/livepatch/livepatch-shadow-mod.c
+++ b/samples/livepatch/livepatch-shadow-mod.c
@@ -96,15 +96,15 @@ MODULE_DESCRIPTION("Buggy module for shadow variable demo");
  * Keep a list of all the dummies so we can clean up any residual ones
  * on module exit
  */
-LIST_HEAD(dummy_list);
-DEFINE_MUTEX(dummy_list_mutex);
+static LIST_HEAD(dummy_list);
+static DEFINE_MUTEX(dummy_list_mutex);
 
 struct dummy {
 	struct list_head list;
 	unsigned long jiffies_expire;
 };
 
-noinline struct dummy *dummy_alloc(void)
+static __used noinline struct dummy *dummy_alloc(void)
 {
 	struct dummy *d;
 	void *leak;
@@ -129,7 +129,7 @@ noinline struct dummy *dummy_alloc(void)
 	return d;
 }
 
-noinline void dummy_free(struct dummy *d)
+static __used noinline void dummy_free(struct dummy *d)
 {
 	pr_info("%s: dummy @ %p, expired = %lx\n",
 		__func__, d, d->jiffies_expire);
@@ -137,7 +137,8 @@ noinline void dummy_free(struct dummy *d)
 	kfree(d);
 }
 
-noinline bool dummy_check(struct dummy *d, unsigned long jiffies)
+static __used noinline bool dummy_check(struct dummy *d,
+					   unsigned long jiffies)
 {
 	return time_after(jiffies, d->jiffies_expire);
 }