[patch, -rc5-mm1] lock validator, irqtrace: support non-x86 architectures

[Ingo Molnar <mingo@elte.hu>]

Subject: lock validator, irqtrace: support non-x86 architectures
From: Ingo Molnar <mingo@elte.hu>

add TRACE_IRQFLAGS_SUPPORT method for architectures to signal
whether they have irq-flags tracing infrastructure.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/i386/Kconfig.debug        |    4 ++++
 arch/x86_64/Kconfig.debug      |    4 ++++
 include/linux/trace_irqflags.h |   30 +++++++++++++++---------------
 lib/Kconfig.debug              |    3 +++
 4 files changed, 26 insertions(+), 15 deletions(-)

Index: linux/arch/i386/Kconfig.debug
===================================================================
--- linux.orig/arch/i386/Kconfig.debug
+++ linux/arch/i386/Kconfig.debug
@@ -1,5 +1,9 @@
 menu "Kernel hacking"
 
+config TRACE_IRQFLAGS_SUPPORT
+	bool
+	default y
+
 source "lib/Kconfig.debug"
 
 config EARLY_PRINTK
Index: linux/arch/x86_64/Kconfig.debug
===================================================================
--- linux.orig/arch/x86_64/Kconfig.debug
+++ linux/arch/x86_64/Kconfig.debug
@@ -1,5 +1,9 @@
 menu "Kernel hacking"
 
+config TRACE_IRQFLAGS_SUPPORT
+	bool
+	default y
+
 source "lib/Kconfig.debug"
 
 config DEBUG_RODATA
Index: linux/include/linux/trace_irqflags.h
===================================================================
--- linux.orig/include/linux/trace_irqflags.h
+++ linux/include/linux/trace_irqflags.h
@@ -11,12 +11,6 @@
 #ifndef _LINUX_TRACE_IRQFLAGS_H
 #define _LINUX_TRACE_IRQFLAGS_H
 
-#include <asm/irqflags.h>
-
-/*
- * The local_irq_*() APIs are equal to the raw_local_irq*()
- * if !TRACE_IRQFLAGS.
- */
 #ifdef CONFIG_TRACE_IRQFLAGS
   extern void trace_hardirqs_on(void);
   extern void trace_hardirqs_off(void);
@@ -31,7 +25,6 @@
 # define trace_softirq_enter()	do { current->softirq_context++; } while (0)
 # define trace_softirq_exit()	do { current->softirq_context--; } while (0)
 # define INIT_TRACE_IRQFLAGS	.softirqs_enabled = 1,
-
 #else
 # define trace_hardirqs_on()		do { } while (0)
 # define trace_hardirqs_off()		do { } while (0)
@@ -48,7 +41,10 @@
 # define INIT_TRACE_IRQFLAGS
 #endif
 
-#ifdef CONFIG_X86
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+
+#include <asm/irqflags.h>
+
 #define local_irq_enable() \
 	do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
 #define local_irq_disable() \
@@ -66,12 +62,16 @@
 			raw_local_irq_restore(flags);		\
 		}						\
 	} while (0)
-#else
-#define raw_local_irq_disable() local_irq_disable()
-#define raw_local_irq_enable() local_irq_enable()
-#define raw_local_irq_save(flags) local_irq_save(flags)
-#define raw_local_irq_restore(flags) local_irq_restore(flags)
-#endif		/* CONFIG_X86 */
+#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
+/*
+ * The local_irq_*() APIs are equal to the raw_local_irq*()
+ * if !TRACE_IRQFLAGS.
+ */
+# define raw_local_irq_disable()	local_irq_disable()
+# define raw_local_irq_enable()		local_irq_enable()
+# define raw_local_irq_save(flags)	local_irq_save(flags)
+# define raw_local_irq_restore(flags)	local_irq_restore(flags)
+#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 
 /*
  * On lockdep we dont want to enable hardirqs in hardirq
@@ -86,7 +86,7 @@
 # define local_irq_enable_in_hardirq()	local_irq_enable()
 #endif
 
-#ifdef CONFIG_X86
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
 #define safe_halt()						\
 	do {							\
 		trace_hardirqs_on();				\
Index: linux/lib/Kconfig.debug
===================================================================
--- linux.orig/lib/Kconfig.debug
+++ linux/lib/Kconfig.debug
@@ -123,6 +123,7 @@ config DEBUG_PREEMPT
 	bool "Debug preemptible kernel"
 	depends on DEBUG_KERNEL && PREEMPT
 	default y
+	depends on TRACE_IRQFLAGS_SUPPORT
 	help
 	  If you say Y here then the kernel will use a debug variant of the
 	  commonly used smp_processor_id() function and will print warnings
@@ -347,6 +348,7 @@ config DEBUG_LOCKDEP
 	bool "Lock dependency engine debugging"
 	depends on LOCKDEP
 	default y
+	depends on TRACE_IRQFLAGS_SUPPORT
 	help
 	  If you say Y here, the lock dependency engine will do
 	  additional runtime checks to debug itself, at the price
@@ -355,6 +357,7 @@ config DEBUG_LOCKDEP
 config TRACE_IRQFLAGS
 	bool
 	default y
+	depends on TRACE_IRQFLAGS_SUPPORT
 	depends on PROVE_SPIN_LOCKING || PROVE_RW_LOCKING
 
 config DEBUG_SPINLOCK_SLEEP