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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@redhat.com>
AuthorDate: Mon, 19 Mar 2018 14:35:54 -0400
Committer: Ingo Molnar <mingo@kernel.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@redhat.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1521484555-8620-2-git-send-email-joe.lawrence@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.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)

/*
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