From 5f627f8e122a163ce53908d55e088247db31f1d7 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Wed, 30 Jan 2008 13:30:47 +0100 Subject: [PATCH] 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 Acked-by:Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/mips/kernel/i8253.c | 12 ++++-------- arch/x86/kernel/i8253.c | 12 ++++-------- 2 files changed, 8 insertions(+), 16 deletions(-) diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c index c2d497ceffd..fc4aa07b6d3 100644 --- a/arch/mips/kernel/i8253.c +++ b/arch/mips/kernel/i8253.c @@ -24,9 +24,7 @@ DEFINE_SPINLOCK(i8253_lock); static void init_pit_timer(enum clock_event_mode mode, struct clock_event_device *evt) { - unsigned long flags; - - spin_lock_irqsave(&i8253_lock, flags); + spin_lock(&i8253_lock); switch(mode) { case CLOCK_EVT_MODE_PERIODIC: @@ -55,7 +53,7 @@ static void init_pit_timer(enum clock_event_mode mode, /* Nothing to do here */ break; } - spin_unlock_irqrestore(&i8253_lock, flags); + spin_unlock(&i8253_lock); } /* @@ -65,12 +63,10 @@ static void init_pit_timer(enum clock_event_mode mode, */ static int pit_next_event(unsigned long delta, struct clock_event_device *evt) { - unsigned long flags; - - spin_lock_irqsave(&i8253_lock, flags); + spin_lock(&i8253_lock); outb_p(delta & 0xff , PIT_CH0); /* LSB */ outb(delta >> 8 , PIT_CH0); /* MSB */ - spin_unlock_irqrestore(&i8253_lock, flags); + spin_unlock(&i8253_lock); return 0; } diff --git a/arch/x86/kernel/i8253.c b/arch/x86/kernel/i8253.c index 377c3f8411f..c76fef1ce35 100644 --- a/arch/x86/kernel/i8253.c +++ b/arch/x86/kernel/i8253.c @@ -38,9 +38,7 @@ struct clock_event_device *global_clock_event; static void init_pit_timer(enum clock_event_mode mode, struct clock_event_device *evt) { - unsigned long flags; - - spin_lock_irqsave(&i8253_lock, flags); + spin_lock(&i8253_lock); switch(mode) { case CLOCK_EVT_MODE_PERIODIC: @@ -71,7 +69,7 @@ static void init_pit_timer(enum clock_event_mode mode, /* Nothing to do here */ break; } - spin_unlock_irqrestore(&i8253_lock, flags); + spin_unlock(&i8253_lock); } /* @@ -81,12 +79,10 @@ static void init_pit_timer(enum clock_event_mode mode, */ static int pit_next_event(unsigned long delta, struct clock_event_device *evt) { - unsigned long flags; - - spin_lock_irqsave(&i8253_lock, flags); + spin_lock(&i8253_lock); outb_p(delta & 0xff , PIT_CH0); /* LSB */ outb(delta >> 8 , PIT_CH0); /* MSB */ - spin_unlock_irqrestore(&i8253_lock, flags); + spin_unlock(&i8253_lock); return 0; } -- 2.41.1