linux-kernel - [tip:sched/urgent] sched/debug: Fix per-task line continuation for console output

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Date:   Tue, 20 Mar 2018 04:18:37 -0700
From:   tip-bot for Joe Lawrence <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, torvalds@...ux-foundation.org,
        mingo@...nel.org, tglx@...utronix.de, linux-kernel@...r.kernel.org,
        joe.lawrence@...hat.com, hpa@...or.com
Subject: [tip:sched/urgent] sched/debug: Fix per-task line continuation for
 console output

Commit-ID:  a8c024cd9b9683d25ae1f459525dd2c6bec75e79
Gitweb:     https://git.kernel.org/tip/a8c024cd9b9683d25ae1f459525dd2c6bec75e79
Author:     Joe Lawrence <joe.lawrence@...hat.com>
AuthorDate: Mon, 19 Mar 2018 14:35:54 -0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 20 Mar 2018 09:30:09 +0100

sched/debug: Fix per-task line continuation for console output

When the SEQ_printf() macro prints to the console, it runs a simple
printk() without KERN_CONT "continued" line printing.  The result of
this is oddly wrapped task info, for example:

  % echo t > /proc/sysrq-trigger
  % dmesg
  ...
  runnable tasks:
  ...
  [   29.608611]  I
  [   29.608613]       rcu_sched     8      3252.013846      4087   120
  [   29.608614]         0.000000        29.090111         0.000000
  [   29.608615]  0 0
  [   29.608616]  /

Modify SEQ_printf to use pr_cont() for expected one-line results:

  % echo t > /proc/sysrq-trigger
  % dmesg
  ...
  runnable tasks:
  ...
  [  106.716329]  S        cpuhp/5    37      2006.315026        14   120         0.000000         0.496893         0.000000 0 0 /

Signed-off-by: Joe Lawrence <joe.lawrence@...hat.com>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1521484555-8620-2-git-send-email-joe.lawrence@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 1ca0130ed4f9..50026aa2d81e 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -32,7 +32,7 @@ static DEFINE_SPINLOCK(sched_debug_lock);
 	if (m)					\
 		seq_printf(m, x);		\
 	else					\
-		printk(x);			\
+		pr_cont(x);			\
  } while (0)
 
 /*