Re: Header conflicts with shmget() and SHM_HUGE_2MB

[Andi Kleen]

> I can see such definitions are tagged as "obsolete" in the uapi headers.
> Do we need some ifndef protection with the glibc headers?

They should be still supported, but also the more generic macro.
> 
> What is the advice to follow for userspace? Skip <linux/shm.h> and
> openly redefine the SHM_HUGE_* wherever needed?

glibc (or other C libraries if not using linux/shm) should add the
defines.  Short term you would need to redefine on your own yes.

-Andi