Re: [PATCH v3 1/2] config: Adding the new config parameter CONFIG_PROVE_LOCKING_SMALL for sparc

[Babu Moger]

On 9/28/2016 3:39 AM, Peter Zijlstra wrote:
> On Tue, Sep 27, 2016 at 12:33:27PM -0700, Babu Moger wrote:
> > 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@xxxxxxxxxx>
> You forgot to Cc Dave, and since you're touching sparc I need an Ack
> from him before I can queue this.
Dave, Can you please take a look at the patch. Please ack it if it looks 
good.
Thanks
> Dave?
>
> > ---
> >   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