[PATCH] printk: detect incomplete lines

[Vegard Nossum]

This patch makes printk() remember the previous caller, and if changed,
output a newline to make the next message start in the right place.

Signed-off-by: Vegard Nossum <vegard.nossum@xxxxxxxxx>
---
 kernel/printk.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/kernel/printk.c b/kernel/printk.c
index 8fb01c3..6080e66 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -672,6 +672,7 @@ static int printk_recursion_bug;
 
 asmlinkage int vprintk(const char *fmt, va_list args)
 {
+	static void *prev_caller;
 	static int log_level_unknown = 1;
 	static char printk_buf[1024];
 
@@ -718,6 +719,16 @@ asmlinkage int vprintk(const char *fmt, va_list args)
 	printed_len += vscnprintf(printk_buf + printed_len,
 				  sizeof(printk_buf) - printed_len, fmt, args);
 
+	if (prev_caller != __builtin_frame_address(0) && !log_level_unknown) {
+		emit_log_char('.');
+		emit_log_char('.');
+		emit_log_char('.');
+		emit_log_char('\n');
+		log_level_unknown = 1;
+	}
+
+	prev_caller = __builtin_frame_address(0);
+
 	/*
 	 * Copy the output into log_buf.  If the caller didn't provide
 	 * appropriate log level tags, we insert them here
-- 
1.5.4.1

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