linux-kernel - Re: [PATCH 8/9] x86: ramdisk info print with high bits.

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Date:	Fri, 16 Nov 2012 12:08:46 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH 8/9] x86: ramdisk info print with high bits.

Use %#010llx

Yinghai Lu <yinghai@...nel.org> wrote:

>On Fri, Nov 16, 2012 at 11:39 AM, H. Peter Anvin <hpa@...or.com> wrote:
>> On 11/16/2012 11:21 AM, Yinghai Lu wrote:
>>>>
>>>> NAK, this is expected to match the resource print format (%pR),
>which
>>>> prints 10 digits by default and then expands.  Furthermore,
>printing
>>>> *18* digits is downright silly since we still don't have 72-bit
>addressing.
>>>
>>> that is the same as in e820_print_map::
>>>
>>>                 printk(KERN_INFO "%s: [mem %#018Lx-%#018Lx] ", who,
>>>                        (unsigned long long) e820.map[i].addr,
>>>                        (unsigned long long)
>>>                        (e820.map[i].addr + e820.map[i].size - 1));
>>>
>>>
>>> that is for 64bit address.
>>> that extra 2 is for "0x"
>>>
>>
>> Oh, right.  It's the use of %#... I usually use 0x%... so I didn't
>think
>> of it.
>>
>>> or you prefer to cast them to pointer and use %pR for them all?
>>>
>>> or fix printk to add extra 2 for "0x" when # is found?
>>
>> We should normally use %pR or the equivalent format.  The only reason
>we
>> do it different for e820_print_map is because it prints a whole bunch
>of
>> lines in which we want the columns to line up.
>
>so we just use #llx or #Lx instead in this patch?

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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