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Re: [Xen-devel] [PATCH 13/14] xen/mm: Convert {s, g}et_gpfn_from_mfn() to use typesafe MFN
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 10 May 2019 15:27:43 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 10 May 2019 14:27:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 10/05/2019 15:14, Jan Beulich wrote:
>>>> On 10.05.19 at 16:05, <andrew.cooper3@xxxxxxxxxx> wrote:
>> The overwhelming majority way of printing mfns is via:
>>
>> mfn %"PRI_mfn"
>>
>> which is almost fully consistent across the x86 code.
>>
>> Various bits of common code, and most of ARM code use variations of
>> %#"PRI_mfn", and this ought to be fixed.
> Oh, so you're fine with omitting the 0x here? That's fine with me. I've
> suggested its addition merely because commonly you ask for the prefix.
This falls into the category of "what is commonly done" vs "what is ideal".
Personally, I'd prefer to have no ambiguity between dec and hex, and
would in principle prefer to start printing mfns with a leading 0x.
However, we a) don't have the current expectations documented, and b) I
consider it rude and obstructive to make an undocumented change to
expectations as part of reviewing an unrelated change. (I certainly
find it obstructive when others do it to me in review.)
So long as the number is clearly identified as an mfn (which it wasn't
previously), the prevailing format used in Xen is %05lx, and this what
should be used.
When point a) above is addressed, there can be a proposed change to
expectations by patching the docs and adjusting the existing users.
~Andrew
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