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authorRichard Weinberger <richard@nod.at>2014-12-10 13:53:51 +0100
committerRichard Weinberger <richard@nod.at>2015-01-04 14:20:26 +0100
commitf911d731054ab3d82ee72a16b889e17ca3a2332a (patch)
tree57cf2f7ad304459ae6af5fc5aa1788c5d550f7fb
parentd753856c9f9ae33a980192aa7b81d8b97d79dec2 (diff)
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>
-rw-r--r--arch/um/Kconfig.common1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index 87bc86821bc9..d195a87ca542 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -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