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From: Josh Boyer <>
Date: Mon, 11 Nov 2013 08:39:16 -0500
Subject: [PATCH] lib/cpumask: Make CPUMASK_OFFSTACK usable without debug

When CPUMASK_OFFSTACK was added in 2008, it was dependent upon
DEBUG_PER_CPU_MAPS being enabled, or an architecture could select it.
The debug dependency adds additional overhead that isn't required for
operation of the feature, and we need CPUMASK_OFFSTACK to increase the
NR_CPUS value beyond 512 on x86.  We drop the current dependency and make
sure SMP is set.

Bugzilla: N/A
Upstream-status: Nak'd, supposedly replacement coming to auto-select

Signed-off-by: Josh Boyer <>
 lib/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Kconfig b/lib/Kconfig
index 3a2ef67db6c7..4af1e7e5a611 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -396,7 +396,8 @@ config CHECK_SIGNATURE
-	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
+	bool "Force CPU masks off stack"
+	depends on SMP
 	  Use dynamic allocation for cpumask_var_t, instead of putting
 	  them on the stack.  This is a bit more expensive, but avoids