Commit 8a5ec0ba "Lockless (and preemptless) fastpaths for slub" makes use of this_cpu_cmpxchg_double() which needs this_cpu_cmpxchg16b_emu() on x86_64. Implementing cmpxchg16b emulation for UML would introduce too much complexity. So just disable it.
LKML-Reference: <20110412192014.gf16...@mtj.dyndns.org> Reported-by: Sergei Trofimovich <sly...@gmail.com> Signed-off-by: Richard Weinberger <rich...@nod.at> --- arch/um/Kconfig.x86 | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/arch/um/Kconfig.x86 b/arch/um/Kconfig.x86 index 02fb017..a9da516 100644 --- a/arch/um/Kconfig.x86 +++ b/arch/um/Kconfig.x86 @@ -4,6 +4,10 @@ menu "UML-specific options" menu "Host processor type and features" +config CMPXCHG_LOCAL + bool + default n + source "arch/x86/Kconfig.cpu" endmenu -- 1.6.6.1 ------------------------------------------------------------------------------ Forrester Wave Report - Recovery time is now measured in hours and minutes not days. Key insights are discussed in the 2010 Forrester Wave Report as part of an in-depth evaluation of disaster recovery service providers. Forrester found the best-in-class provider in terms of services and vision. Read this report now! http://p.sf.net/sfu/ibm-webcastpromo _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
