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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-06-17 17:43:59 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-06-26 14:37:27 +1000
commit5d38902c483881645ba16058cffaa478b81e5cfa (patch)
tree1ed21b6a245c772a6d86cac7cd8ebe566dd970bb /arch/powerpc/kernel/setup_32.c
parent04a85d1234d7e1682a612565e663e6b760918643 (diff)
powerpc: Add irqtrace support for 32-bit powerpc
Based on initial work from: Dale Farnsworth <dale@farnsworth.org> Add the low level irq tracing hooks for 32-bit powerpc needed to enable full lockdep functionality. The approach taken to deal with the code in entry_32.S is that we don't trace all the transitions of MSR:EE when we just turn it off to peek at TI_FLAGS without races. Only when we are calling into C code or returning from exceptions with a state that have changed from what lockdep thinks. There's a little bugger though: If we take an exception that keeps interrupts enabled (such as an alignment exception) while interrupts are enabled, we will call trace_hardirqs_on() on the way back spurriously. Not a big deal, but to get rid of it would require remembering in pt_regs that the exception was one of the type that kept interrupts enabled which we don't know at this stage. (Well, we could test all cases for regs->trap but that sucks too much). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/setup_32.c')
-rw-r--r--arch/powerpc/kernel/setup_32.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 1d154248cf40..e1e3059cf34b 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -119,6 +119,8 @@ notrace unsigned long __init early_init(unsigned long dt_ptr)
*/
notrace void __init machine_init(unsigned long dt_ptr)
{
+ lockdep_init();
+
/* Enable early debugging if any specified (see udbg.h) */
udbg_early_init();