Re: [PATCH v2] uhid: Remove local copy of uhid header

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Hi Batien,

>>>> uhid.h is part of kernel uapi nowadays so it can be included
>>>> directly from linux/uhid.h so this removes the local copy to use
>>>> it
>>>> instead.
>>> 
>>> This will cause the same problems that importing those headers into
>>> the
>>> repository was supposed to solve. If you remove those headers, then
>>> older distributions will be stuck on old kernel headers, and bluez
>>> compilations will regularly fail when it uses new structs, struct
>>> members, functions, or constants that are in the upstream uapi
>>> headers
>>> but not yet propagated to the user's distribution.
>> 
>> I'm not following you on this, the distros don't have uapi headers
>> that match their kernel release? Afaik being a kernel uapi means
>> these
>> APIs are considered stable and I suspect they haven't been changed in
>> a while, you are right that this introduces a kernel dependency if we
>> were to use new members but I still think this is better than having
>> copies that at some point goes out of sync, specially when nothing
>> indicates that things like input_event was not accepted by the
>> kernel.
> 
> Let's say you want to use a KEY_* definition that was recently added to
> the kernel, what would you do?
> 
>>> Strong NAK on this one and the uinput header change too.
>> 
>> I didn't introduce the usage of any new symbols, so the only new
>> requirement is that linux/uinput.h and linux/uhid.h headers exist, I
>> could however rollback if we have another way to check if those
>> headers exists use then otherwise we can keep using copies, perhaps
>> move then under linux/ directory, anyway it is not like we don't have
>> kernel dependencies already and we actually have been debating on
>> having the bluetooth socket definitions as part of the uapi instead
>> of
>> libbluetooth, so we will need to sort out how we can update the
>> userspace parts with new kernel interface without breaking the build
>> on systems that don't actually ship with e.g. linux/bluetooth.h.
> 
> You're talking about the state of things now, I'm talking about the
> compilation failures once you rely on a slightly newer header that
> isn't shipped with a distribution.
> 
> But if you're willing to react to the compilation failure in the
> future, I can't really stand in your way. It just seems weird to do
> this now just to undo it the moment you'll need a slightly newer kernel
> header.

if I can’t build the tarballs on 5.10.0-7-powerpc, then they don’t get released.

Regards

Marcel




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