[lkml]   [2018]   [Mar]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 2/3] usb: host: pci: introduce PCI vendor ID for Netlogic
Am Mittwoch, den 14.03.2018, 16:44 +0100 schrieb Richard Leitner:
> On 03/14/2018 04:27 PM, Oliver Neukum wrote:
> > Am Mittwoch, den 14.03.2018, 14:31 +0100 schrieb Richard Leitner:
> > >
> > Well, but it does not. Removing a redundant definition is a clear
> > benefit. But you are not removing a definition. You are introducing
> > a preprocessor constant. Why?
> > What is its benefit?
> AFAIK pci_ids.h collects PCI vendor and device IDs in one single
> point. As the PCI vendor ID of Netlogic is used in multiple files
> IMHO it would be a good idea to add it to pci_ids.h and furthermore
> remove it from arch/mips/include/asm/netlogic/xlp-hal/iomap.h (where
> it's currently defined).
> Or am I getting things wrong?

I think so, yes. We are giving names to constants as a form
of comment or to change them at multiple places at once and



makes clearly sense. So does

#define XYZ_MAGIC_VALUE1 0xab4e

because it tells you that you have a magic value.
But you will never redefine a PCI vendor ID. In fact you
must not. And if you have a comparison like

dev->vID == 0x1234

if you change this to


what good does this to you? You already knew it was a vendor ID.
Now you can name it at a glance. So what? If you have a device
you will have to check whether you have some OEM version. You
will always go and check the raw number. And if you have a log
and need to check whether the check will be true, you will have
a number.
Using a constant there is nothing but trouble. Yet one more grep.


 \ /
  Last update: 2018-03-15 10:33    [W:0.037 / U:1.232 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site