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authorJoe Lawrence <joe.lawrence@redhat.com>2017-10-13 22:08:43 +0300
committerJiri Kosina <jkosina@suse.cz>2017-10-19 11:09:01 +0300
commitaf026796054fb70439e919a925615e61b500ef6b (patch)
treeb8166bee3c59d71ea7802e84a6c8ad7c0957cf11 /kernel/livepatch/transition.c
parent6116c3033a761611b1da980ea664c6ddff3eaed6 (diff)
downloadlinux-af026796054fb70439e919a925615e61b500ef6b.tar.xz
livepatch: add transition notices
Log a few kernel debug messages at the beginning of the following livepatch transition functions: klp_complete_transition() klp_cancel_transition() klp_init_transition() klp_reverse_transition() Also update the log notice message in klp_start_transition() for similar verbiage as the above messages. Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'kernel/livepatch/transition.c')
-rw-r--r--kernel/livepatch/transition.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index 53887f0bca10..56add6327736 100644
--- a/kernel/livepatch/transition.c
+++ b/kernel/livepatch/transition.c
@@ -82,6 +82,10 @@ static void klp_complete_transition(void)
unsigned int cpu;
bool immediate_func = false;
+ pr_debug("'%s': completing %s transition\n",
+ klp_transition_patch->mod->name,
+ klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
+
if (klp_target_state == KLP_UNPATCHED) {
/*
* All tasks have transitioned to KLP_UNPATCHED so we can now
@@ -163,6 +167,9 @@ void klp_cancel_transition(void)
if (WARN_ON_ONCE(klp_target_state != KLP_PATCHED))
return;
+ pr_debug("'%s': canceling patching transition, going to unpatch\n",
+ klp_transition_patch->mod->name);
+
klp_target_state = KLP_UNPATCHED;
klp_complete_transition();
}
@@ -441,7 +448,8 @@ void klp_start_transition(void)
WARN_ON_ONCE(klp_target_state == KLP_UNDEFINED);
- pr_notice("'%s': %s...\n", klp_transition_patch->mod->name,
+ pr_notice("'%s': starting %s transition\n",
+ klp_transition_patch->mod->name,
klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
/*
@@ -497,6 +505,9 @@ void klp_init_transition(struct klp_patch *patch, int state)
*/
klp_target_state = state;
+ pr_debug("'%s': initializing %s transition\n", patch->mod->name,
+ klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
+
/*
* If the patch can be applied or reverted immediately, skip the
* per-task transitions.
@@ -562,6 +573,11 @@ void klp_reverse_transition(void)
unsigned int cpu;
struct task_struct *g, *task;
+ pr_debug("'%s': reversing transition from %s\n",
+ klp_transition_patch->mod->name,
+ klp_target_state == KLP_PATCHED ? "patching to unpatching" :
+ "unpatching to patching");
+
klp_transition_patch->enabled = !klp_transition_patch->enabled;
klp_target_state = !klp_target_state;