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Date: Wed, 5 May 2010 00:02:24 +0800 From: 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> Subject: [PATCH 2/2] lockdep: allow user to disable CONFIG_TRACE_IRQFLAGS 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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