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um: Skip futex_atomic_cmpxchg_inatomic() test

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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>
This commit is contained in:
Richard Weinberger 2014-12-10 13:53:51 +01:00
parent d753856c9f
commit f911d73105
1 changed files with 1 additions and 0 deletions
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arch/um/Kconfig.common
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@ -3,6 +3,7 @@ config UML
default y default y
select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_AUDITSYSCALL
select HAVE_UID16 select HAVE_UID16
select HAVE_FUTEX_CMPXCHG if FUTEX
select GENERIC_IRQ_SHOW select GENERIC_IRQ_SHOW
select GENERIC_CPU_DEVICES select GENERIC_CPU_DEVICES
select GENERIC_IO select GENERIC_IO