linux-kernel - Re: [PATCH 2/2] lockdep: allow user to disable CONFIG_TRACE

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Date:	Wed, 5 May 2010 00:06:53 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	Ming Lei <tom.leiming@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] lockdep: allow user to disable CONFIG_TRACE_IRQFLAGS

CC: ARM

2010/5/5  <tom.leiming@...il.com>:
> From: Ming Lei <tom.leiming@...il.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@...il.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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