linux-kernel - Re: [PATCH 4/5 v2] x86 boot: show pfn addresses in hex not decimal in some kernel info printks

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Message-ID: <48626460.1000905@zytor.com>
Date:	Wed, 25 Jun 2008 08:29:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Paul Jackson <pj@....com>, yhlu.kernel@...il.com,
	akpm@...ux-foundation.org, mingo@...e.hu, tglx@...utronix.de,
	steiner@....com, travis@....com, linux-kernel@...r.kernel.org,
	ying.huang@...el.com, andi@...stfloor.org
Subject: Re: [PATCH 4/5 v2] x86 boot: show pfn addresses in hex not decimal
 in some kernel info printks

Linus Torvalds wrote:
> 
> On Tue, 24 Jun 2008, H. Peter Anvin wrote:
>> Any reason we can't just re-define %p to print the 0x prefix, just as glibc
>> does?  It'd be easy enough to go and sed out all the 0x%p's currently in the
>> kernel.
> 
> You didn't listen. I want #p to do the _symbolic_ address. The thing we 
> have in the backtraces etc. With nice symbol offset information etc.
> 
> The '0x<hex>' thing isn't all that interesting. You can do it by adding 
> the '0x' by hand, or by using a cast and using %#lx instead.
> 

You're right, I didn't.  I still think the 0x%p's and -- even worse -- 
0x%08lx's (what about 64 bits?!) we currently have *all over the kernel* 
suck, but yes, that's a minor problem and getting the symbolic info 
would be a very nice thing.

It looks like gcc will warn about just about ever modifier to %p.  I 
wondered whose diseased brain came up with that idea.

Overall, I think the glibc people have botched their printf extensions 
horribly, failing to pick up the very useful %I extension from Windows 
and instead using %I for something completely conflicting is 
particularly pissy.

	-hpa

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