3:27 p.m.
Benjamin Herrenschmidt <benh(a)kernel.crashing.org> writes:
On Wed, 2020-04-01 at 01:48 -0700, Dan Williams wrote:
> >
> > +u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size)
> > +{
> > + struct pci_controller *hose = pci_bus_to_host(pdev->bus);
> > + struct pnv_phb *phb = hose->private_data;
>
> Is calling the local variable 'hose' instead of 'host' on purpose?
Haha that's funny :-)
It's an oooooooold usage that comes iirc from sparc ? or maybe alpha ?
Yeah it was alpha, I found it in the history tree:
https://github.com/mpe/linux-fullhistory/blob/1928de59ba4209dc5e9f2cef635...
And airlied found an old manual which confirms it:
The TIOP module interfaces the AlphaServer 8000 system bus to four I/O channels, called
"hoses."
https://www.hpl.hp.com/hpjournal/dtj/vol7num1/vol7num1art4.pdf
So at least now we know where it comes from.
It's also used widely in mips, microblaze, sh and a little bit in drm.
cheers
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Michael Ellerman