Re: glibc and linux-man disagrees about pkey_alloc

[Florian Weimer <fweimer at redhat dot com>]

On 05/16/2018 01:10 PM, Szabolcs Nagy wrote:
> glibc sysdeps/unix/sysv/linux/bits/mman-shared.h:
>
> int pkey_alloc (unsigned int __flags, unsigned int __access_rights) 
> __THROW;
>
> linux-man http://man7.org/linux/man-pages/man2/pkey_alloc.2.html :
>
> int pkey_alloc(unsigned long flags, unsigned long access_rights);
>
> i assume the documentation should be fixed (as the glibc
> code is already in use)

unsigned long on the kernel side is unsigned long long in userspace for 
the x32 variant of x86-64, so the kernel types aren't that helpful for 
describing the user-space interface in an architecture-independent 
fashion.  I expect the flags to be consistent across architectures, so 
there can only be 32 of them anyway, and access rights currently use two 
bits on x86 (and three on POWER, I think).

Thanks,
Florian