[Devel] [PATCH RH9 01/33] rh/lib/cpumask: Make CPUMASK_OFFSTACK usable without debug dependency

[Andrey Zhadchenko]

From: Josh Boyer <jwboyer at fedoraproject.org>

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 <jwboyer at fedoraproject.org>

khorenko@: taken from Fedora 27 kernel, otherwise NR_CPUS is limited to 64
without CONFIG_MAXSMP set.

(cherry picked from vz8 commit bf34653509606bdca624f645498045f8a3a593b3)
Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
---
 lib/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Kconfig b/lib/Kconfig
index 5c9c068..6a3cdf3d 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -498,7 +498,8 @@ config CHECK_SIGNATURE
 	bool
 
 config CPUMASK_OFFSTACK
-	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
+	bool "Force CPU masks off stack"
+	depends on SMP
 	help
 	  Use dynamic allocation for cpumask_var_t, instead of putting
 	  them on the stack.  This is a bit more expensive, but avoids
-- 
1.8.3.1