mirror of
https://github.com/torvalds/linux.git
synced 2024-12-23 19:31:53 +00:00
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"
|
|
|
|
menu "UML-specific options"
|
|
|
|
menu "Host processor type and features"
|
|
|
|
config CMPXCHG_LOCAL
|
|
bool
|
|
default n
|
|
|
|
source "arch/x86/Kconfig.cpu"
|
|
|
|
endmenu
|
|
|
|
config UML_X86
|
|
def_bool y
|
|
select GENERIC_FIND_FIRST_BIT
|
|
select GENERIC_FIND_NEXT_BIT
|
|
|
|
config 64BIT
|
|
bool
|
|
default SUBARCH = "x86_64"
|
|
|
|
config X86_32
|
|
def_bool !64BIT
|
|
select HAVE_AOUT
|
|
|
|
config X86_64
|
|
def_bool 64BIT
|
|
|
|
config RWSEM_XCHGADD_ALGORITHM
|
|
def_bool X86_XADD
|
|
|
|
config RWSEM_GENERIC_SPINLOCK
|
|
def_bool !X86_XADD
|
|
|
|
config 3_LEVEL_PGTABLES
|
|
bool "Three-level pagetables (EXPERIMENTAL)" if !64BIT
|
|
default 64BIT
|
|
depends on EXPERIMENTAL
|
|
help
|
|
Three-level pagetables will let UML have more than 4G of physical
|
|
memory. All the memory that can't be mapped directly will be treated
|
|
as high memory.
|
|
|
|
However, this it experimental on 32-bit architectures, so if unsure say
|
|
N (on x86-64 it's automatically enabled, instead, as it's safe there).
|
|
|
|
config ARCH_HAS_SC_SIGNALS
|
|
def_bool !64BIT
|
|
|
|
config ARCH_REUSE_HOST_VSYSCALL_AREA
|
|
def_bool !64BIT
|
|
|
|
config SMP_BROKEN
|
|
def_bool 64BIT
|
|
|
|
config GENERIC_HWEIGHT
|
|
def_bool y
|
|
|
|
source "arch/um/Kconfig.um"
|
|
|
|
endmenu
|
|
|
|
source "arch/um/Kconfig.rest"
|