[PATCH 01/16] CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS: set if CPUMASK_OFFSTACK.

[Rusty Russell]

Using these functions with offstack cpus is unsafe.  They use all NR_CPUS
bits, unstead of nr_cpumask_bits.

In particular, lustre (in staging) used cpus_ and that caused a bug.

Reported-by: Oleg Drokin <green@xxxxxxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
---
 lib/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Kconfig b/lib/Kconfig
index 87da53bb1fef..722427805220 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -398,8 +398,8 @@ config CPUMASK_OFFSTACK
 	  stack overflow.
 
 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
-       bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
-       depends on BROKEN
+       bool
+       depends on CPUMASK_OFFSTACK
 
 config CPU_RMAP
 	bool
-- 
2.1.0

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