Merge "arm64: break while loop if task had been rescheduled" (0abca3c4) · Commits · e / devices / android_kernel_oneplus_sm8150

arch/arm64/kernel/traps.c

+23 −0

Original line number	Diff line number	Diff line
		@@ -102,6 +102,9 @@ void dump_backtrace(struct pt_regs regs, struct task_struct tsk)
		{
		struct stackframe frame;
		int skip;
		long cur_state = 0;
		unsigned long cur_sp = 0;
		unsigned long cur_fp = 0;

		pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);

		@@ -120,6 +123,9 @@ void dump_backtrace(struct pt_regs regs, struct task_struct tsk)
		*/
		frame.fp = thread_saved_fp(tsk);
		frame.pc = thread_saved_pc(tsk);
		cur_state = tsk->state;
		cur_sp = thread_saved_sp(tsk);
		cur_fp = frame.fp;
		}
		#ifdef CONFIG_FUNCTION_GRAPH_TRACER
		frame.graph = tsk->curr_ret_stack;
		@@ -128,6 +134,23 @@ void dump_backtrace(struct pt_regs regs, struct task_struct tsk)
		skip = !!regs;
		printk("Call trace:\n");
		do {
		if (tsk != current && (cur_state != tsk->state
		/*
		* We would not be printing backtrace for the task
		* that has changed state from uninterruptible to
		* running before hitting the do-while loop but after
		* saving the current state. If task is in running
		* state before saving the state, then we may print
		* wrong call trace or end up in infinite while loop
		* if (fp) and (fp+8) are same. While the situation
		* will stop print when that task schedule out.
		*/
		\|\| cur_sp != thread_saved_sp(tsk)
		\|\| cur_fp != thread_saved_fp(tsk))) {
		printk("The task:%s had been rescheduled!\n",
		tsk->comm);
		break;
		}
		/* skip until specified stack frame */
		if (!skip) {
		dump_backtrace_entry(frame.pc);