Re: [chrony-users] PPS GPIO polling driver license

["Kevin P. Fleming" <lists.chrony-users@xxxxxxxxxxxxx>]

Usage of this driver does not involve making any syscalls directly into the driver; the driver provides a PPS interface into the kernel's PPS (RFC2783 API) core, and that is where the syscalls land. There is no need for a syscall exception for the driver itself as no userspace program will ever interact directly with it.

On Fri, Jul 7, 2023, at 18:26, Thangalin wrote:

We're not deriving from or modifying the PPS GPIO driver, but we would like to use it (verbatim) to improve chrony's performance, hence the Linux syscall exception. If that's not permissible, we will need to find a different solution.

Cheers from Coquitlam, Bill!

On Fri, Jul 7, 2023 at 3:11 PM Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:

So you are worried that if you write a non-GPL program which uses the pps

gpio, you will get sued for your own program being a derived work of PPS-gpio?

William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273

Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324

UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx

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