x86: add CONFIG_X86_USERSPACE for Intel64
Hidden config to select dependencies. Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
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@ -75,4 +75,13 @@ config X86_STACK_PROTECTION
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bounds of the current process stack are overflowed. This is done
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by preceding all stack areas with a 4K guard page.
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config X86_USERSPACE
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bool
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default y if USERSPACE
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select THREAD_STACK_INFO
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help
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This option enables APIs to drop a thread's privileges down to ring 3,
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supporting user-level threads that are protected from each other and
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from crashing the kernel.
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endif # X86_64
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