From: Richard Weinberger <richard@nod.at>
Date: Wed, 10 Dec 2014 12:53:51 +0000 (+0100)
Subject: um: Skip futex_atomic_cmpxchg_inatomic() test
X-Git-Tag: fixes-v4.0-rc1~344^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f911d731054ab3d82ee72a16b889e17ca3a2332a;p=pandora-kernel.git

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 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>
---

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