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-rw-r--r--arch/arm/Kconfig8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 853aab5ab327..becc6d684051 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1292,9 +1292,15 @@ config KASAN_SHADOW_OFFSET
config NR_CPUS
int "Maximum number of CPUs (2-32)"
- range 2 32
+ range 2 16 if DEBUG_KMAP_LOCAL
+ range 2 32 if !DEBUG_KMAP_LOCAL
depends on SMP
default "4"
+ help
+ The maximum number of CPUs that the kernel can support.
+ Up to 32 CPUs can be supported, or up to 16 if kmap_local()
+ debugging is enabled, which uses half of the per-CPU fixmap
+ slots as guard regions.
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"