Adding the new config parameter CONFIG_PROVE_LOCKING_SMALL for sparc.
This feature limits the space used for "Lock debugging: prove locking
correctness" by about 4MB. The current sparc systms have the limitation of
32MB size for kernel size including .text, .data and .bss sections. With
PROVE_LOCKING feature, the kernel size could grow beyond this limit and
causing system bootup issues. With this option, kernel limits the size
of the entries of lock_chains, stack_trace etc. so that kernel fits in
required size limit. This is only visible for sparc.
Signed-off-by: Babu Moger <babu.mo...@oracle.com>
---
lib/Kconfig.debug | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index b9cfdbf..c79de25 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1035,6 +1035,7 @@ config PROVE_LOCKING
select DEBUG_MUTEXES
select DEBUG_LOCK_ALLOC
select TRACE_IRQFLAGS
+ select PROVE_LOCKING_SMALL if SPARC
default n
help
This feature enables the kernel to prove that all locking
@@ -1070,6 +1071,22 @@ config PROVE_LOCKING
For more details, see Documentation/locking/lockdep-design.txt.
+config PROVE_LOCKING_SMALL
+ bool "Limit the space for prove locking correctness"
+ depends on PROVE_LOCKING && SPARC
+ help
+ This feature limits the space used for "Lock debugging: prove
+ locking correctness" by about 4MB. In sparc system, all the
+ kernel's code, data, and bss, must have locked translations in
+ the TLB so that it does not hit TLB misses. The current sparc
+ chips have 8 TLB entries available that may be locked down, and
+ with a 4mb page size, this gives a maximum of 32mb of memory for
+ the kernel size. With PROVE_LOCKING feature, the kernel size could
+ grow beyond this limit and causing system bootup issues. With
+ this option, kernel limits the size of the entries of lock_chains,
+ stack_trace etc. to debug PROVE_LOCKING so that kernel size fits
+ in 32MB. This is only visible for SPARC.
+
config LOCKDEP
bool
depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT
&& LOCKDEP_SUPPORT
--
1.7.1
