diff options
| author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2008-12-17 19:40:33 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-18 14:35:53 +0100 |
| commit | 74c8a6130486bed224e960790f4aa72dd09c061e (patch) | |
| tree | 0d6da9737c66ca2f4b2a20b7eb34e6c2d04ba4cc | |
| parent | 6f8a0ed4e5d86c01db5e7e3f95d9003b7cf9cb87 (diff) | |
locking, irq: enclose irq_desc_lock_class in CONFIG_LOCKDEP
Impact: simplify code
commit "08678b0: generic: sparse irqs: use irq_desc() [...]" introduced
the irq_desc_lock_class variable.
But it is used only if CONFIG_SPARSE_IRQ=Y or CONFIG_TRACE_IRQFLAGS=Y.
Otherwise, following warnings happen:
CC kernel/irq/handle.o
kernel/irq/handle.c:26: warning: 'irq_desc_lock_class' defined but not used
Actually, current early_init_irq_lock_class has a bit strange and messy ifdef.
In addition, it is not valueable.
1. this function is protected by !CONFIG_SPARSE_IRQ, but that is not necessary.
if CONFIG_SPARSE_IRQ=Y, desc of all irq number are initialized by NULL
at first - then this function calling is safe.
2. this function protected by CONFIG_TRACE_IRQFLAGS too. but it is not
necessary either, because lockdep_set_class() doesn't have bad side
effect even if CONFIG_TRACE_IRQFLAGS=n.
This patch bloat kernel size a bit on CONFIG_TRACE_IRQFLAGS=n and
CONFIG_SPARSE_IRQ=Y - but that's ok. early_init_irq_lock_class() is not
a fastpatch at all.
To avoid messy ifdefs is more important than a few bytes diet.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/linux/lockdep.h | 2 | ||||
| -rw-r--r-- | kernel/irq/handle.c | 5 |
2 files changed, 1 insertions, 6 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 29aec6e1002..9dba554c802 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -377,7 +377,7 @@ do { \ #endif /* CONFIG_LOCK_STAT */ -#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_GENERIC_HARDIRQS) +#ifdef CONFIG_GENERIC_HARDIRQS extern void early_init_irq_lock_class(void); #else static inline void early_init_irq_lock_class(void) diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index f1a23069c20..6492400cb50 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -422,11 +422,8 @@ out: } #endif - -#ifdef CONFIG_TRACE_IRQFLAGS void early_init_irq_lock_class(void) { -#ifndef CONFIG_SPARSE_IRQ struct irq_desc *desc; int i; @@ -436,9 +433,7 @@ void early_init_irq_lock_class(void) lockdep_set_class(&desc->lock, &irq_desc_lock_class); } -#endif } -#endif #ifdef CONFIG_SPARSE_IRQ unsigned int kstat_irqs_cpu(unsigned int irq, int cpu) |