From: Josh Boyer <jwbo...@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 <jwbo...@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.zhadche...@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
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