Since version 4.9, the kernel automatically breaks printk calls into
multiple newlines unless pr_cont is used. Fix the alpha stacktrace code,
so that it prints stack trace in four columns, as it was initially
intended.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v4.9+
---
arch/alpha/kernel/traps.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
Index: linux-stable/arch/alpha/kernel/traps.c
===================================================================
--- linux-stable.orig/arch/alpha/kernel/traps.c 2017-12-30 11:37:13.000000000 +0100
+++ linux-stable/arch/alpha/kernel/traps.c 2017-12-30 11:47:29.000000000 +0100
@@ -158,11 +158,16 @@ void show_stack(struct task_struct *task
for(i=0; i < kstack_depth_to_print; i++) {
if (((long) stack & (THREAD_SIZE-1)) == 0)
break;
- if (i && ((i % 4) == 0))
- printk("\n ");
- printk("%016lx ", *stack++);
+ if ((i % 4) == 0) {
+ if (i)
+ pr_cont("\n");
+ printk(" ");
+ } else {
+ pr_cont(" ");
+ }
+ pr_cont("%016lx", *stack++);
}
- printk("\n");
+ pr_cont("\n");
dik_show_trace(sp);
}
--
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