[PATCH] CONFIG_DEBUG_SPINLOCK_SLEEP

This makes the sleep-under-spinlock-held check a CONFIG_ option.

arch/i386/Kconfig

@@ -1612,6 +1612,12 @@ config KALLSYMS
 	  symbolic stack backtraces. This increases the size of the kernel
 	  somewhat, as all symbols have to be loaded into the kernel image.
 
+config DEBUG_SPINLOCK_SLEEP
+	bool "Sleep-inside-spinlock checking"
+	help
+	  If you say Y here, various routines which may sleep will become very
+	  noisy if they are called with a spinlock held.	
+
 config X86_EXTRA_IRQS
 	bool
 	depends on X86_LOCAL_APIC

include/linux/kernel.h

@@ -40,7 +40,7 @@
 
 struct completion;
 
-#ifdef CONFIG_DEBUG_KERNEL
+#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
 void __might_sleep(char *file, int line);
 #define might_sleep() __might_sleep(__FILE__, __LINE__)
 #else

kernel/ksyms.c

@@ -481,7 +481,7 @@ EXPORT_SYMBOL(jiffies_64);
 EXPORT_SYMBOL(xtime);
 EXPORT_SYMBOL(do_gettimeofday);
 EXPORT_SYMBOL(do_settimeofday);
-#ifdef CONFIG_DEBUG_KERNEL
+#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
 EXPORT_SYMBOL(__might_sleep);
 #endif
 #if !defined(__ia64__)

kernel/sched.c

@@ -2253,7 +2253,7 @@ void __init sched_init(void)
 	enter_lazy_tlb(&init_mm, current, smp_processor_id());
 }
 
-#ifdef CONFIG_DEBUG_KERNEL
+#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
 void __might_sleep(char *file, int line)
 {
 #if defined(in_atomic)