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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 <[email protected]>
Suggested-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>
Tested-by: Daniel Walter <[email protected]>
This commit is contained in:
Richard Weinberger 2014-12-10 13:53:51 +01:00
commit f911d73105
1 changed files with 1 additions and 0 deletions
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1
arch/um/Kconfig.common
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@ -3,6 +3,7 @@ config UML
default y
select HAVE_ARCH_AUDITSYSCALL
select HAVE_UID16
select HAVE_FUTEX_CMPXCHG if FUTEX
select GENERIC_IRQ_SHOW
select GENERIC_CPU_DEVICES
select GENERIC_IO