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>

1 files changed, 6 insertions, 2 deletions

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index f16a46e8849c..97b64d7d6bf6 100644
--- 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)