tree 152a10095bcd9a0b8768311b344d1f742d3aee96
parent d831add1c78d41acb30654d9a4321af2e1f06487
author Al Viro <viro@zeniv.linux.org.uk> 1584671028 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1585280724 -0400

x86: get rid of user_atomic_cmpxchg_inatomic()

Only one user left; the thing had been made polymorphic back in 2013
for the sake of MPX.  No point keeping it now that MPX is gone.
Convert futex_atomic_cmpxchg_inatomic() to user_access_{begin,end}()
while we are at it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>