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H A Dfutex.hdiff f5544ba712afd1b01dd856c7eecfb5d30beaf920 Fri Mar 20 03:23:48 CET 2020 Al Viro <viro@zeniv.linux.org.uk> 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>