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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>
This commit is contained in:
Joe Lawrence 2017-10-13 15:08:43 -04:00 committed by Jiri Kosina
parent 6116c3033a
commit af02679605
1 changed files with 17 additions and 1 deletions
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18
kernel/livepatch/transition.c
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@ -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;