linux-kernel - Re: [patch] printk: remove some dead code

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Date:	Tue, 03 Jul 2012 19:59:31 +0200
From:	Kay Sievers <kay@...hat.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] printk: remove some dead code

On Tue, 2012-07-03 at 13:21 +0200, Kay Sievers wrote:
> On Tue, Jul 3, 2012 at 12:45 PM, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> > Static checkers complain about the impossible condition here.
> >
> > In 084681d14e ('printk: flush continuation lines immediately to
> > console'), we changed msg->level from being a u16 to being an unsigned
> > 3 bit bitfield.  That means we can remove the code here to handle log
> > levels which are in the tens or hundreds column.
> 
> We should do that for the facility value, now that level is split up
> in separate fields. I'll prepare a fix.

Here it is. Nice tool, very useful.

Thanks again,
Kay


From: Kay Sievers <kay@...y.org>
Subject: kmsg: add the facility number to the syslog prefix

After the recent split of facility and level into separate variables,
we miss the facility value (always 0 for kernel-originated messages)
in the syslog prefix.

On Tue, Jul 3, 2012 at 12:45 PM, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> Static checkers complain about the impossible condition here.
>
> In 084681d14e ('printk: flush continuation lines immediately to
> console'), we changed msg->level from being a u16 to being an unsigned
> 3 bit bitfield.

Cc: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Kay Sievers <kay@...y.org>
---
 kernel/printk.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -818,15 +818,16 @@ static size_t print_time(u64 ts, char *b
 static size_t print_prefix(const struct log *msg, bool syslog, char *buf)
 {
 	size_t len = 0;
+	unsigned int prefix = (msg->facility << 3) | msg->level;
 
 	if (syslog) {
 		if (buf) {
-			len += sprintf(buf, "<%u>", msg->level);
+			len += sprintf(buf, "<%u>", prefix);
 		} else {
 			len += 3;
-			if (msg->level > 9)
+			if (prefix > 9)
 				len++;
-			if (msg->level > 99)
+			if (prefix > 99)
 				len++;
 		}
 	}


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