linux-kernel - Re: [PATCH] printk: Let %pR handle NULL pointers

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Date:	Sun, 04 Jan 2009 20:48:13 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Trent Piepho <xyzzy@...akeasy.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Harvey Harrison <harvey.harrison@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] printk: Let %pR handle NULL pointers


> I thought of doing that too, but then all the various %pX formats would all
> have to print the same for NULL pointers.  For instance a resource prints
> out like "[0x1000-0x100f]", so I chose "[NULL]" for printing a null
> resource pointer.  Maybe "[]" or "[-]" would be better?  A null MAC address
> could be ":::::" or "x:x:x:x:x:x".  "N.U.L.L" or "x.x.x.x" for a null IP4
> address.  And so on.  So the printout looks nicer when a NULL pointer isn't
> a bug.

And how often is that ?

Seriously... 

Ben.


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