[PATCH 2/2] lockdep: allow user to disable CONFIG_TRACE_IRQFLAGS
Ming Lei
tom.leiming at gmail.com
Tue May 4 12:06:53 EDT 2010
CC: ARM
2010/5/5 <tom.leiming at gmail.com>:
> From: Ming Lei <tom.leiming at 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 at 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
>
>
--
Lei Ming
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