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>

1 files changed, 2 insertions, 3 deletions

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 60cdf6386763..d4de33934dac 100644
--- 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