[PATCH RFC 0/3] nptl: Introduce and use FUTEX_LOCK_PI2

[Florian Weimer]

* Kurt Kanzenbach:

> At this point __ASSUME_FUTEX_LOCK_PI2 is false meaning the kernel does
> not have FUTEX_LOCK_PI2 support. But, it calls FUTEX_LOCK_PI2 for
> clockid monotonic. This will result in ENOSYS unless it's an old kernel
> which is patched. Is that intended?

That's not quite how the __ASSUME_* macros work.  If not defined, it
just means that glibc won't assume that the kernel feature is there.  It
can still use it (the run-time kernel might have it after all), but
glibc has to check for the feature and has to compile in some sort of
fallback code.

Thanks,
Florian