[git pull] vfs.git compat and uaccess

{get,put}_compat_sigset() series + assorted compat ioctl stuff + more set_fs() elimination + a few more timespec64 conversions + several removals of pointless access_ok() in places where it was followed only by non-__ variants of primitives. One conflict (in

[git pull] vfs.git compat and uaccess

{get,put}_compat_sigset() series + assorted compat ioctl stuff + more set_fs() elimination + a few more timespec64 conversions + several removals of pointless access_ok() in places where it was followed only by non-__ variants of primitives. One conflict (in