linux-kernel - Re: [PATCH] use %p for pointers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20061011145441.GB29920@ftp.linux.org.uk>
Date:	Wed, 11 Oct 2006 15:54:41 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	torvalds@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] use %p for pointers

On Wed, Oct 11, 2006 at 01:16:56PM +0200, Jan Engelhardt wrote:
> 
> >diff --git a/drivers/sbus/char/uctrl.c b/drivers/sbus/char/uctrl.c
> >index ddc0681..b30372f 100644
> >--- a/drivers/sbus/char/uctrl.c
> >+++ b/drivers/sbus/char/uctrl.c
> >@@ -400,7 +400,7 @@ static int __init ts102_uctrl_init(void)
> > 	}
> > 
> > 	driver->regs->uctrl_intr = UCTRL_INTR_RXNE_REQ|UCTRL_INTR_RXNE_MSK;
> >-	printk("uctrl: 0x%x (irq %d)\n", driver->regs, driver->irq);
> >+	printk("uctrl: 0x%p (irq %d)\n", driver->regs, driver->irq);
> 
> So what's the difference, except that %p will evaluate to (nil) or 
> (null) when the argument is 0 [this is the case with glibc]?
> That would print 0x(nil).

%p will do no such thing in the kernel.  As for the difference...  %x
might happen to work on some architectures (where sizeof(void *)==sizeof(int)),
but it's not portable _and_ not right.  %p is proper C for that...
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/