[PATCH v2 2/4] printk/kdb: Handle more message headers

From: Petr Mladek
Date: Wed Nov 09 2016 - 07:42:06 EST


The commit 4bcc595ccd80decb4245096e ("printk: reinstate KERN_CONT for
printing continuation lines") allows to define more message headers
for a single message. The motivation is that continuous lines might
get mixed. Therefore it make sense to define the right log level
for every piece of a cont line.

This patch introduces printk_skip_headers() that will skip all
headers and uses it in the kdb code instead of printk_skip_level().

This approach helps to fix other printk_skip_level() users
independently.

Signed-off-by: Petr Mladek <pmladek@xxxxxxxx>
---
include/linux/printk.h | 8 ++++++++
kernel/debug/kdb/kdb_io.c | 2 +-
2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/linux/printk.h b/include/linux/printk.h
index eac1af8502bb..a0859e169bc3 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -31,6 +31,14 @@ static inline const char *printk_skip_level(const char *buffer)
return buffer;
}

+static inline const char *printk_skip_headers(const char *buffer)
+{
+ while (printk_get_level(buffer))
+ buffer = printk_skip_level(buffer);
+
+ return buffer;
+}
+
#define CONSOLE_EXT_LOG_MAX 8192

/* printk's without a loglevel use this.. */
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index fc1ef736253c..98c9011eac78 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -697,7 +697,7 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
* Write to all consoles.
*/
retlen = strlen(kdb_buffer);
- cp = (char *) printk_skip_level(kdb_buffer);
+ cp = (char *) printk_skip_headers(kdb_buffer);
if (!dbg_kdb_mode && kgdb_connected) {
gdbstub_msg_write(cp, retlen - (cp - kdb_buffer));
} else {
--
1.8.5.6