[PATCH 1/2] stacktrace: fix print_stack_trace printing timestamp twice

[Andrey Konovalov]

Right now print_stack_trace prints timestamp twice, the first time
it's done by printk when printing spaces, the second - by print_ip_sym.
As a result, stack traces in KASAN reports have double timestamps:
[   18.822232] Allocated by task 3838:
[   18.822232]  [   18.822232] [<ffffffff8107e236>] save_stack_trace+0x16/0x20
[   18.822232]  [   18.822232] [<ffffffff81509bd6>] save_stack+0x46/0xd0
[   18.822232]  [   18.822232] [<ffffffff81509e4b>] kasan_kmalloc+0xab/0xe0
....

Fix by calling printk only once.

Signed-off-by: Andrey Konovalov <andreyk...@google.com>
---
 kernel/stacktrace.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index b6e4c16..56f510f 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -14,13 +14,15 @@
 void print_stack_trace(struct stack_trace *trace, int spaces)
 {
        int i;
+       unsigned long ip;
 
        if (WARN_ON(!trace->entries))
                return;
 
        for (i = 0; i < trace->nr_entries; i++) {
-               printk("%*c", 1 + spaces, ' ');
-               print_ip_sym(trace->entries[i]);
+               ip = trace->entries[i];
+               printk("%*c[<%p>] %pS\n", 1 + spaces, ' ',
+                               (void *) ip, (void *) ip);
        }
 }
 EXPORT_SYMBOL_GPL(print_stack_trace);
-- 
2.8.0.rc3.226.g39d4020