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Re: [Xen-devel] [PATCH 4/5] print: introduce a format specifier for pci_sbdf_t
- To: Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 24 May 2019 11:59:47 +0100
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- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, 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>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Brian Woods <brian.woods@xxxxxxx>
- Delivery-date: Fri, 24 May 2019 11:00:02 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 24/05/2019 11:36, Jan Beulich wrote:
>>>> On 10.05.19 at 18:10, <roger.pau@xxxxxxxxxx> wrote:
>> The new format specifier is '%pp', and prints a pci_sbdf_t using the
>> seg:bus:dev.func format. Replace all SBDFs printed using
>> '%04x:%02x:%02x.%u' to use the new format specifier.
> So on the positive side Linux doesn't use 'p' yet, so we're only at risk
> of a future conflict. However, having to pass a 64-bit pointer just
> to print a 32-bit entity seems rather wasteful to me. Since we can't
> use entirely new format specifiers, did you consider (ab)using one
> we rarely use, like %o, suffixed similarly like we do for %p? The
> extension could be restricted to apply only when neither field width
> nor precision nor any flags were specified, i.e. only to plain %o (at
> least initially).
>
> We'd then have something along the lines of
>
> #define PRI_sbdf "op"
> #define PRI_SBDF(v) ((v).sbdf)
>
> and
>
> printk("%" PRI_sbdf ": ...\n", PRI_SBDF(pdev->sbdf), ...);
Except the answer will be the same as every time you've asked this in
the past.
No, because -Wformat doesn't tolerate it.
The *only* flexibility we have to play with is suffixes to %p
~Andrew
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