From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935544AbcI0Tek (ORCPT ); Tue, 27 Sep 2016 15:34:40 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:18117 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754516AbcI0TeM (ORCPT ); Tue, 27 Sep 2016 15:34:12 -0400 From: Babu Moger To: peterz@infradead.org, mingo@redhat.com, akpm@linux-foundation.org, keescook@chromium.org, dan.j.williams@intel.com, aryabinin@virtuozzo.com, tj@kernel.org, sam@ravnborg.org Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, babu.moger@oracle.com Subject: [PATCH v3 1/2] config: Adding the new config parameter CONFIG_PROVE_LOCKING_SMALL for sparc Date: Tue, 27 Sep 2016 12:33:27 -0700 Message-Id: <1475004808-91920-2-git-send-email-babu.moger@oracle.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1475004808-91920-1-git-send-email-babu.moger@oracle.com> References: <1475004808-91920-1-git-send-email-babu.moger@oracle.com> X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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