Subject: + lib-cpumask-make-cpumask_offstack-usable-without-debug-dependency.patch added to -mm tree
To: jwboyer@xxxxxxxxxx,hpa@xxxxxxxxx,jwboyer@xxxxxxxxxxxxxxxxx,mingo@xxxxxxxxxx,tglx@xxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 11 Nov 2013 15:02:54 -0800
The patch titled
Subject: lib/cpumask: make CPUMASK_OFFSTACK usable without debug dependency
has been added to the -mm tree. Its filename is
lib-cpumask-make-cpumask_offstack-usable-without-debug-dependency.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/lib-cpumask-make-cpumask_offstack-usable-without-debug-dependency.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/lib-cpumask-make-cpumask_offstack-usable-without-debug-dependency.patch
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------------------------------------------------------
From: Josh Boyer <jwboyer@xxxxxxxxxx>
Subject: lib/cpumask: make CPUMASK_OFFSTACK usable without debug dependency
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.
Signed-off-by: Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN lib/Kconfig~lib-cpumask-make-cpumask_offstack-usable-without-debug-dependency lib/Kconfig
--- a/lib/Kconfig~lib-cpumask-make-cpumask_offstack-usable-without-debug-dependency
+++ a/lib/Kconfig
@@ -349,7 +349,8 @@ 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
_
Patches currently in -mm which might be from jwboyer@xxxxxxxxxx are
lib-cpumask-make-cpumask_offstack-usable-without-debug-dependency.patch
linux-next.patch
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