Messages in this thread | | | Date | Wed, 5 May 2010 00:06:53 +0800 | Subject | Re: [PATCH 2/2] lockdep: allow user to disable CONFIG_TRACE_IRQFLAGS | From | Ming Lei <> |
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CC: ARM
2010/5/5 <tom.leiming@gmail.com>: > From: Ming Lei <tom.leiming@gmail.com> > > There is still the lost irq-on tracing issue on ARM, > (see http://marc.info/?l=linux-arm-kernel&m=126047420005553&w=2) > which may disable lockdep after kernel boot, seems no > good solution for the issue up to now. > > The patch exports the config option of CONFIG_TRACE_IRQFLAGS > and allows user to disable it for support of checking circular > dead lock only if irq flags tracing can't work correctly always. > > Signed-off-by: Ming Lei <tom.leiming@gmail.com> > --- > lib/Kconfig.debug | 3 +++ > lib/locking-selftest.c | 2 ++ > 2 files changed, 5 insertions(+), 0 deletions(-) > > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > index 935248b..448f18f 100644 > --- a/lib/Kconfig.debug > +++ b/lib/Kconfig.debug > @@ -550,11 +550,14 @@ config DEBUG_LOCKDEP > of more runtime overhead. > > config TRACE_IRQFLAGS > + bool "Lock prove: IRQ flags tracing" > depends on DEBUG_KERNEL > bool > default y > depends on TRACE_IRQFLAGS_SUPPORT > depends on PROVE_LOCKING > + help > + If you say Y here, IRQ flags will be traced to prove locking. > > config DEBUG_SPINLOCK_SLEEP > bool "Spinlock debugging: sleep-inside-spinlock checking" > diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c > index 619313e..d9e5bfe 100644 > --- a/lib/locking-selftest.c > +++ b/lib/locking-selftest.c > @@ -1176,6 +1176,7 @@ void locking_selftest(void) > > printk(" --------------------------------------------------------------------------\n"); > > +#ifdef CONFIG_TRACE_IRQFLAGS > /* > * irq-context testcases: > */ > @@ -1188,6 +1189,7 @@ void locking_selftest(void) > > DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion); > // DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2); > +#endif > > if (unexpected_testcase_failures) { > printk("-----------------------------------------------------------------\n"); > -- > 1.6.2.5 > >
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