printk: when dumping regs, show the stack, not thread_info

We currently show:

  task: <current> ti: <current_thread_info()> task.ti: <task_thread_info(current)>"

"ti" and "task.ti" are redundant, and neither is actually what we want
to show, which the the base of the thread stack.  Change the display to
show the stack pointer explicitly.

Link: http://lkml.kernel.org/r/543ac5bd66ff94000a57a02e11af7239571a3055.1468523549.git.luto@kernel.org
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 60cdf63867632bdca556d7ab32a2824138a48f4c..d4de33934dacc41d481269bd7fe7e7b2660e1efd 100644 (file)
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -3177,9 +3177,8 @@ void show_regs_print_info(const char *log_lvl)
 {
        dump_stack_print_info(log_lvl);
 
-       printk("%stask: %p ti: %p task.ti: %p\n",
-              log_lvl, current, current_thread_info(),
-              task_thread_info(current));
+       printk("%stask: %p task.stack: %p\n",
+              log_lvl, current, task_stack_page(current));
 }
 
 #endif