From: Joe Perches <joe@perches.com>
To: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: "Bjørn Mork" <bjorn@mork.no>,
"Sergei Shtylyov" <sergei.shtylyov@cogentembedded.com>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@google.com>,
netdev@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] net: skbuff: use _RET_IP_
Date: Thu, 30 May 2013 22:20:59 -0700 [thread overview]
Message-ID: <1369977659.10556.34.camel@joe-AO722> (raw)
In-Reply-To: <1369962688.1751.6.camel@buesod1.americas.hpqcorp.net>
On Thu, 2013-05-30 at 18:11 -0700, Davidlohr Bueso wrote:
> On Thu, 2013-05-30 at 13:08 +0200, Bjørn Mork wrote:
> > Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> writes:
> >
> > > Why not "text:%#lx" as already used in this string? It's
> > > equivalent to "0x%lx".
> >
> > Well, I don't know the reasoning in this case, but I'd like to note that
> > those are not strictly equivalent. Personally I find the formatting of 0
> > annoying enough to avoid %#x for any value which may be 0. It's
> > especially bad if you try to line up things by adding leading zeros.
>
> Yep, I found that 0x%lx produced the same output as %p.
Don't use a standalone gcc compiled program to
determine what the kernel outputs.
lib/vsprintf.c does not output the same. (32 bit)
The kernel output is;
printk("0x%lx\n", 0x100ul) 0x100
printk("%p\n", (void *)0x100ul) 00000100
printk("%#p\n", (void *)0x100ul) 0x00000100
The last one isn't used at all in kernel source. (gcc complains)
It's always "0x%p"
next prev parent reply other threads:[~2013-05-31 5:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-29 21:09 [PATCH] net: skbuff: use _RET_IP_ Davidlohr Bueso
2013-05-29 21:43 ` Sergei Shtylyov
2013-05-30 11:08 ` Bjørn Mork
2013-05-31 1:11 ` Davidlohr Bueso
2013-05-31 5:20 ` Joe Perches [this message]
2013-05-31 7:06 ` Bjørn Mork
2013-05-31 14:33 ` Sergei Shtylyov
2013-05-31 16:54 ` Joe Perches
2013-05-31 17:51 ` Sergei Shtylyov
2013-06-01 0:10 ` David Miller
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