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084189a887
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.
Signed-off-by: Richard Weinberger <richard@nod.at>
Reported-by: Sergei Trofimovich <slyich@gmail.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
66 lines
1.1 KiB
Plaintext
66 lines
1.1 KiB
Plaintext
source "arch/um/Kconfig.common"
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menu "UML-specific options"
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menu "Host processor type and features"
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config CMPXCHG_LOCAL
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bool
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default n
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source "arch/x86/Kconfig.cpu"
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endmenu
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config UML_X86
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def_bool y
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select GENERIC_FIND_FIRST_BIT
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select GENERIC_FIND_NEXT_BIT
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config 64BIT
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bool
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default SUBARCH = "x86_64"
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config X86_32
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def_bool !64BIT
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select HAVE_AOUT
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config X86_64
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def_bool 64BIT
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config RWSEM_XCHGADD_ALGORITHM
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def_bool X86_XADD
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config RWSEM_GENERIC_SPINLOCK
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def_bool !X86_XADD
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config 3_LEVEL_PGTABLES
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bool "Three-level pagetables (EXPERIMENTAL)" if !64BIT
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default 64BIT
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depends on EXPERIMENTAL
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help
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Three-level pagetables will let UML have more than 4G of physical
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memory. All the memory that can't be mapped directly will be treated
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as high memory.
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However, this it experimental on 32-bit architectures, so if unsure say
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N (on x86-64 it's automatically enabled, instead, as it's safe there).
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config ARCH_HAS_SC_SIGNALS
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def_bool !64BIT
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config ARCH_REUSE_HOST_VSYSCALL_AREA
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def_bool !64BIT
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config SMP_BROKEN
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def_bool 64BIT
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config GENERIC_HWEIGHT
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def_bool y
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source "arch/um/Kconfig.um"
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endmenu
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source "arch/um/Kconfig.rest"
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