um: Skip futex_atomic_cmpxchg_inatomic() test

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commit f911d73105 upstream.

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 <miklos@szeredi.hu>
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
Tested-by: Daniel Walter <d.walter@0x90.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Richard Weinberger 2014-12-10 13:53:51 +01:00 • committed by Greg Kroah-Hartman

parent d896e223d6

commit b388e0d110

1 changed files with 1 additions and 0 deletions

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