i386: Mark NUMA support experimental

I did some testing and found quite a lot of problems (doesn't
boot at all on non NUMA and misassigns cores on Opteron systems).

Mark it as experimental and warn against its use for now.

It's still default y for SUMMIT/NUMAQ because it'll presumably
work on these systems.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index f16a46e..97b64d7 100644 (file)
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -614,10 +614,14 @@ config X86_PAE
 
 # Common NUMA Features
 config NUMA
-       bool "Numa Memory Allocation and Scheduler Support"
-       depends on SMP && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI)
+       bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
+       depends on SMP && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL
        default n if X86_PC
        default y if (X86_NUMAQ || X86_SUMMIT)
+       help
+         NUMA support for i386. This is currently high experimental
+         and should be only used for kernel development. It might also
+         cause boot failures.
 
 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
        depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)