linux-kernel - [tip:x86/asm] x86/dumpstack: Make printk_stack

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Date:   Thu, 8 Sep 2016 02:49:11 -0700
From:   tip-bot for Josh Poimboeuf <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     keescook@...omium.org, rostedt@...dmis.org, jpoimboe@...hat.com,
        peterz@...radead.org, tglx@...utronix.de, hpa@...or.com,
        brgerst@...il.com, mingo@...nel.org, torvalds@...ux-foundation.org,
        luto@...capital.net, nilayvaish@...il.com, fweisbec@...il.com,
        byungchul.park@....com, linux-kernel@...r.kernel.org
Subject: [tip:x86/asm] x86/dumpstack: Make printk_stack_address() more
 generally useful

Commit-ID:  d438f5fda30ec087512355e405e9c8955d8bd337
Gitweb:     http://git.kernel.org/tip/d438f5fda30ec087512355e405e9c8955d8bd337
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Wed, 24 Aug 2016 11:50:16 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 8 Sep 2016 08:58:40 +0200

x86/dumpstack: Make printk_stack_address() more generally useful

Change printk_stack_address() to be useful when called by an unwinder
outside the context of dump_trace().

Specifically:

- printk_stack_address()'s 'data' argument is always used as the log
  level string.  Make that explicit.

- Call touch_nmi_watchdog().

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Byungchul Park <byungchul.park@....com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Nilay Vaish <nilayvaish@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/9fbe0db05bacf66d337c162edbf61450d0cff1e2.1472057064.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/dumpstack.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 01072e9..f0ddf85 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -26,10 +26,11 @@ int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
 static int die_counter;
 
 static void printk_stack_address(unsigned long address, int reliable,
-		void *data)
+				 char *log_lvl)
 {
+	touch_nmi_watchdog();
 	printk("%s [<%p>] %s%pB\n",
-		(char *)data, (void *)address, reliable ? "" : "? ",
+		log_lvl, (void *)address, reliable ? "" : "? ",
 		(void *)address);
 }
 
@@ -148,7 +149,6 @@ static int print_trace_stack(void *data, char *name)
  */
 static int print_trace_address(void *data, unsigned long addr, int reliable)
 {
-	touch_nmi_watchdog();
 	printk_stack_address(addr, reliable, data);
 	return 0;
 }