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authorRalf Baechle <ralf@linux-mips.org>2008-01-30 07:30:47 -0500
committerIngo Molnar <mingo@elte.hu>2008-01-30 07:30:47 -0500
commit5f627f8e122a163ce53908d55e088247db31f1d7 (patch)
tree15e48b30394cbfd014aaf7f99f5a4bfee5b8efbb /arch/mips
parentb263295dbffd33b0fbff670720fa178c30e3392a (diff)
mips, x86: optimize the i8259 code a bit
The timer code always calls the clock_event_device set_net_event and set_mode methods with interrupts disabled, so no need to use spin_lock_irqsave / spin_unlock_irqrestore for those. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Acked-by:Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/kernel/i8253.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c
index c2d497ceffdd..fc4aa07b6d35 100644
--- a/arch/mips/kernel/i8253.c
+++ b/arch/mips/kernel/i8253.c
@@ -24,9 +24,7 @@ DEFINE_SPINLOCK(i8253_lock);
24static void init_pit_timer(enum clock_event_mode mode, 24static void init_pit_timer(enum clock_event_mode mode,
25 struct clock_event_device *evt) 25 struct clock_event_device *evt)
26{ 26{
27 unsigned long flags; 27 spin_lock(&i8253_lock);
28
29 spin_lock_irqsave(&i8253_lock, flags);
30 28
31 switch(mode) { 29 switch(mode) {
32 case CLOCK_EVT_MODE_PERIODIC: 30 case CLOCK_EVT_MODE_PERIODIC:
@@ -55,7 +53,7 @@ static void init_pit_timer(enum clock_event_mode mode,
55 /* Nothing to do here */ 53 /* Nothing to do here */
56 break; 54 break;
57 } 55 }
58 spin_unlock_irqrestore(&i8253_lock, flags); 56 spin_unlock(&i8253_lock);
59} 57}
60 58
61/* 59/*
@@ -65,12 +63,10 @@ static void init_pit_timer(enum clock_event_mode mode,
65 */ 63 */
66static int pit_next_event(unsigned long delta, struct clock_event_device *evt) 64static int pit_next_event(unsigned long delta, struct clock_event_device *evt)
67{ 65{
68 unsigned long flags; 66 spin_lock(&i8253_lock);
69
70 spin_lock_irqsave(&i8253_lock, flags);
71 outb_p(delta & 0xff , PIT_CH0); /* LSB */ 67 outb_p(delta & 0xff , PIT_CH0); /* LSB */
72 outb(delta >> 8 , PIT_CH0); /* MSB */ 68 outb(delta >> 8 , PIT_CH0); /* MSB */
73 spin_unlock_irqrestore(&i8253_lock, flags); 69 spin_unlock(&i8253_lock);
74 70
75 return 0; 71 return 0;
76} 72}