[PATCH 9/8] printk: Only look for prefix levels in kernel messages

[Joe Perches]

vprintk_emit prefix parsing should only be done for internal
kernel messages.  This allows existing behavior to be kept
in all cases.

Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
---
 kernel/printk.c |   32 +++++++++++++++++---------------
 1 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/kernel/printk.c b/kernel/printk.c
index 5cd73f7..4e72c07 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1267,7 +1267,6 @@ asmlinkage int vprintk_emit(int facility, int level,
 	static char cont_buf[LOG_LINE_MAX];
 	static size_t cont_len;
 	static int cont_level;
-	int kern_level;
 	static struct task_struct *cont_task;
 	static char textbuf[LOG_LINE_MAX];
 	char *text = textbuf;
@@ -1329,21 +1328,24 @@ asmlinkage int vprintk_emit(int facility, int level,
 		newline = true;
 	}
 
-	/* strip syslog prefix and extract log level or control flags */
-	kern_level = printk_get_level(text);
-	if (kern_level) {
-		const char *end_of_header = printk_skip_level(text);
-		switch (kern_level) {
-		case '0' ... '7':
-			if (level == -1)
-				level = kern_level - '0';
-		case 'd':	/* KERN_DEFAULT */
-			prefix = true;
-		case 'c':	/* KERN_CONT */
-			break;
+	/* strip kernel syslog prefix and extract log level or control flags */
+	if (facility == 0) {
+		int kern_level = printk_get_level(text);
+
+		if (kern_level) {
+			const char *end_of_header = printk_skip_level(text);
+			switch (kern_level) {
+			case '0' ... '7':
+				if (level == -1)
+					level = kern_level - '0';
+			case 'd':	/* KERN_DEFAULT */
+				prefix = true;
+			case 'c':	/* KERN_CONT */
+				break;
+			}
+			text_len -= end_of_header - text;
+			text = (char *)end_of_header;
 		}
-		text_len -=  end_of_header - text;
-		text = (char *)end_of_header;
 	}
 
 	if (level == -1)


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