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Re: [Xen-devel] printf formatter for pci_sbdf_t


  • To: Roger Pau Monné <roger.pau@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 17 Jul 2019 18:06:30 +0100
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  • Cc: Jan Beulich <JBeulich@xxxxxxxx>
  • Delivery-date: Wed, 17 Jul 2019 17:06:42 +0000
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On 17/07/2019 15:08, Roger Pau Monné wrote:
> Hello,
>
> As part of some PCI related cleanup I'm doing, which includes
> expanding the usage of pci_sbdf_t, I'm also planning to add a custom
> printf formatter for pci_sbdf_t [0], so that a SBDF can be printed
> without having to specify four formatters (and pass four parameters)
> each time (%04x:%02x:%02x.%u).
>
> There's been some debate on the previous version about whether the
> formatter should be %pp or %op, and I would like to settle on one of
> them before sending a new version:

I am firmly opposed to overloading %o.

Nothing about PCI coordinates has anything to do with octal
representation; its mostly hex.  And for the record, I'm firmly opposed
to overloading %[xuid] as well.

%p is the only formatter which has magic overloading so far, and
avoiding gaining a second would be of substantial value when it comes to
reading the code.

~Andrew

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