kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/arch/arc/kernel/stacktrace.c
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@@ -1,12 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *	stacktrace.c : stacktracing APIs needed by rest of kernel
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  *			(wrappers over ARC dwarf based unwinder)
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  *
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  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  *
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  *  vineetg: aug 2009
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  *  -Implemented CONFIG_STACKTRACE APIs, primarily save_stack_trace_tsk( )
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@@ -45,11 +42,23 @@
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 seed_unwind_frame_info(struct task_struct *tsk, struct pt_regs *regs,
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 		       struct unwind_frame_info *frame_info)
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 {
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-	/*
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-	 * synchronous unwinding (e.g. dump_stack)
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-	 *  - uses current values of SP and friends
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-	 */
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-	if (regs == NULL && (tsk == NULL || tsk == current)) {
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+	if (regs) {
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+		/*
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+		 * Asynchronous unwinding of intr/exception
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+		 *  - Just uses the pt_regs passed
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+		 */
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+		frame_info->task = tsk;
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+
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+		frame_info->regs.r27 = regs->fp;
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+		frame_info->regs.r28 = regs->sp;
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+		frame_info->regs.r31 = regs->blink;
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+		frame_info->regs.r63 = regs->ret;
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+		frame_info->call_frame = 0;
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+	} else if (tsk == NULL || tsk == current) {
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+		/*
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+		 * synchronous unwinding (e.g. dump_stack)
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+		 *  - uses current values of SP and friends
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+		 */
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 		unsigned long fp, sp, blink, ret;
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 		frame_info->task = current;
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64
 
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@@ -66,7 +75,7 @@
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 		frame_info->regs.r31 = blink;
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 		frame_info->regs.r63 = ret;
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 		frame_info->call_frame = 0;
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-	} else if (regs == NULL) {
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+	} else {
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 		/*
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 		 * Asynchronous unwinding of a likely sleeping task
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 		 *  - first ensure it is actually sleeping
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@@ -97,20 +106,7 @@
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 		frame_info->regs.r28 += 60;
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 		frame_info->call_frame = 0;
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-	} else {
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-		/*
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-		 * Asynchronous unwinding of intr/exception
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-		 *  - Just uses the pt_regs passed
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-		 */
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-		frame_info->task = tsk;
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-
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-		frame_info->regs.r27 = regs->fp;
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-		frame_info->regs.r28 = regs->sp;
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-		frame_info->regs.r31 = regs->blink;
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-		frame_info->regs.r63 = regs->ret;
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-		frame_info->call_frame = 0;
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 	}
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-
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 	return 0;
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 }
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@@ -173,9 +169,11 @@
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 /* Call-back which plugs into unwinding core to dump the stack in
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  * case of panic/OOPs/BUG etc
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  */
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-static int __print_sym(unsigned int address, void *unused)
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+static int __print_sym(unsigned int address, void *arg)
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 {
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-	printk("  %pS\n", (void *)address);
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+	const char *loglvl = arg;
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+
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+	printk("%s  %pS\n", loglvl, (void *)address);
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 	return 0;
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 }
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@@ -232,17 +230,18 @@
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  *-------------------------------------------------------------------------
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  */
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-noinline void show_stacktrace(struct task_struct *tsk, struct pt_regs *regs)
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+noinline void show_stacktrace(struct task_struct *tsk, struct pt_regs *regs,
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+			      const char *loglvl)
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 {
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-	pr_info("\nStack Trace:\n");
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-	arc_unwind_core(tsk, regs, __print_sym, NULL);
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+	printk("%s\nStack Trace:\n", loglvl);
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+	arc_unwind_core(tsk, regs, __print_sym, (void *)loglvl);
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 }
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 EXPORT_SYMBOL(show_stacktrace);
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 /* Expected by sched Code */
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-void show_stack(struct task_struct *tsk, unsigned long *sp)
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+void show_stack(struct task_struct *tsk, unsigned long *sp, const char *loglvl)
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 {
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-	show_stacktrace(tsk, NULL);
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+	show_stacktrace(tsk, NULL, loglvl);
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 }
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 /* Another API expected by schedular, shows up in "ps" as Wait Channel