Re: [uml-devel] [PATCH] um: Skip futex_atomic_cmpxchg_inatomic() test

2014-12-15 Thread Daniel Walter
ednesday, December 10, 2014 1:02:15 PM > Subject: [uml-devel] [PATCH] um: Skip futex_atomic_cmpxchg_inatomic() test > > futex_atomic_cmpxchg_inatomic() does not work on UML because > it triggers a copy_from_user() in kernel context. > On UML copy_from_user() can only be used if the kerne

[PATCH] um: Skip futex_atomic_cmpxchg_inatomic() test

2014-12-10 Thread Richard Weinberger
futex_atomic_cmpxchg_inatomic() does not work on UML because it triggers a copy_from_user() in kernel context. On UML copy_from_user() can only be used if the kernel was called by a real user space process such that UML can use ptrace() to fetch the value. Reported-by: Miklos Szeredi Suggested-by