kernel/livepatch/transition.c

3  * transition.c - Kernel Live Patching transition functions
14 #include "transition.h"
30  * "straggler" tasks which failed to transition in the first attempt.
66  * The transition to the target patch state is complete.  Clean up the data
76 	pr_debug("'%s': completing %s transition\n",  in klp_complete_transition()
95 		 * func->transition gets cleared, the handler may choose a  in klp_complete_transition()
103 			func->transition = false;  in klp_complete_transition()
139  * This is called in the error path, to cancel a transition before it has
141  * klp_start_transition() hasn't.  If the transition *has* been started,
149 	pr_debug("'%s': canceling patching transition, going to unpatch\n",  in klp_cancel_transition()
180 	 *    of func->transition, if klp_ftrace_handler() is called later on  in klp_update_patch_state()
239  * Determine whether it's safe to transition the task to the target patch state
403 	 * Usually this will transition most (or all) of the tasks on a system  in klp_try_complete_transition()
460  * Start the transition to the specified target patch state so tasks can begin
470 	pr_notice("'%s': starting %s transition\n",  in klp_start_transition()
501  * state, and initialize all function transition states to true in preparation
522 	pr_debug("'%s': initializing %s transition\n", patch->mod->name,  in klp_init_transition()
547 	 * func->transition updates to ensure that klp_ftrace_handler() doesn't  in klp_init_transition()
548 	 * see a func in transition with a task->patch_state of KLP_UNDEFINED.  in klp_init_transition()
557 	 * Set the func transition states so klp_ftrace_handler() will know to  in klp_init_transition()
558 	 * switch to the transition logic.  in klp_init_transition()
569 			func->transition = true;  in klp_init_transition()
573  * This function can be called in the middle of an existing transition to
583 	pr_debug("'%s': reversing transition from %s\n",  in klp_reverse_transition()
621  * existing transition to finish.