linux-kernel - [PATCH v3 1/2] config: Adding the new config parameter CONFIG_PROVE_LOCKING

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Date:   Tue, 27 Sep 2016 12:33:27 -0700
From:   Babu Moger <babu.moger@...cle.com>
To:     peterz@...radead.org, mingo@...hat.com, akpm@...ux-foundation.org,
        keescook@...omium.org, dan.j.williams@...el.com,
        aryabinin@...tuozzo.com, tj@...nel.org, sam@...nborg.org
Cc:     linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
        babu.moger@...cle.com
Subject: [PATCH v3 1/2] config: Adding the new config parameter CONFIG_PROVE_LOCKING_SMALL for sparc

This new config parameter limits the space used for "Lock debugging:
prove locking correctness" by about 4MB. The current sparc systems 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 boot-up 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 not visible to user
and only used for sparc.

Signed-off-by: Babu Moger <babu.moger@...cle.com>
---
 arch/sparc/Kconfig |    1 +
 lib/Kconfig.debug  |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 59b0960..8da321c 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -44,6 +44,7 @@ config SPARC
 	select ARCH_HAS_SG_CHAIN
 	select CPU_NO_EFFICIENT_FFS
 	select HAVE_ARCH_HARDENED_USERCOPY
+	select PROVE_LOCKING_SMALL if PROVE_LOCKING

 config SPARC32
 	def_bool !64BIT
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index cab7405..597e589 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1084,6 +1084,9 @@ config PROVE_LOCKING

 	 For more details, see Documentation/locking/lockdep-design.txt.

+config PROVE_LOCKING_SMALL
+	bool
+
 config LOCKDEP
 	bool
 	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
-- 
1.7.1