On Sun, 2007-08-26 at 10:30 +0200, Geert Uytterhoeven wrote: 

On Fri, 24 Aug 2007, Joe Perches wrote:

quoted

Corrected printk calls with multiple output lines which
did not correctly preface each line with KERN_<level>
Fixed uses of some single lines with too many KERN_<level>

--- a/arch/arm/kernel/ecard.c
+++ b/arch/arm/kernel/ecard.c

@@ -547,7 +547,8 @@ static void ecard_check_lockup(struct irq_desc *desc)
 	if (last == jiffies) {
 		lockup += 1;
 		if (lockup > 1000000) {
-			printk(KERN_ERR "\nInterrupt lockup detected - "
+			printk(KERN_ERR "\n"
+			       KERN_ERR "Interrupt lockup detected - "
 			       "disabling all expansion card interrupts\n");
 
 			desc->chip->mask(IRQ_EXPANSIONCARD);

What's the purpose of having lines printed with e.g. `KERN_ERR "\n"' only?
Shouldn't these just be removed?

My preference too.  There could be a separate effort for that.

egrep -r --include=*.[ch] "KERN_[A-Z]*[[:space:]]+\"\\\n" * | wc -l
104

These are either errors or a desire to prettify logs with
vertical whitespace.  I think vertical whitespace doesn't help.

Usually lines starting with `\n' are continuations, but given some other
module may call printk() in between, there's no guarantee continuations
appear on the same line.

printk KERN_<level>s were sometimes bolted on after code was written.

etherfoo_card_init()
{
	printk(KERN_INFO "etherfoo card");
	slot = foo_getslot();
	if (slot < 0) {
		printk("\n" KERN_ERR "etherfoo card slot not found\n");
		return -1;
	}
	printk(" found in slot %d", slot);
	irq = foo_getirq();
	if (irq < 0) {
		printk("\n" KERN_ERR "etherfoo card irq not found\n");
		return -1;
	}
	printk(" with irq %d\n", irq);
}

Sometimes, a KERN_ERR is misplaced, or the "\n" is missing.

	printk(KERN_ERR "\n" msg);
or
	printk(KERN_ERR msg);

To me, the card announcement printk should move to the
end of the card_init routine and just be a single printk.

etherfoo_card_init()
{
	slot = foo_getslot();
	if (slot < 0) {
		printk(KERN_ERR "etherfoo card slot not found\n");
		return -1;
	}
	irq = foo_getirq();
	if (irq < 0) {
		printk(KERN_ERR "etherfoo card irq not found\n");
		return -1;
	}
	printk(KERN_INFO "etherfoo card in slot %d with irq %d\n",
	       slot, irq);
}