get rid of the address_space override in setsockopt

[David Laight]

From: Christoph Hellwig
> Sent: 20 July 2020 13:47
> 
> setsockopt is the last place in architecture-independ code that still
> uses set_fs to force the uaccess routines to operate on kernel pointers.
> 
> This series adds a new sockptr_t type that can contained either a kernel
> or user pointer, and which has accessors that do the right thing, and
> then uses it for setsockopt, starting by refactoring some low-level
> helpers and moving them over to it before finally doing the main
> setsockopt method.

Another 'gotcha' ...

On an least some architectures (possibly only m68k) IIRC all structures
are actually passed by reference.
(This used to be true for sparc - but it may have changed in the
last 30 years.)

	David
 

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)