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Date: Sun, 28 Oct 2007 17:54:15 +0100 (CET) From: Thomas Gleixner <tglx@...utronix.de> To: Ralf Baechle <ralf@...ux-mips.org> cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] Optimize i8259 code a bit. On Sun, 28 Oct 2007, Ralf Baechle wrote: > 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. Good point, Acked-by:Thomas Gleixner <tglx@...utronix.de> > diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c > index 5d9830d..1b54674 100644 > --- a/arch/mips/kernel/i8253.c > +++ b/arch/mips/kernel/i8253.c > @@ -23,9 +23,7 @@ static 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: > @@ -54,7 +52,7 @@ 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); > } > > /* > @@ -64,12 +62,10 @@ 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 a42c807..5246515 100644 > --- a/arch/x86/kernel/i8253.c > +++ b/arch/x86/kernel/i8253.c > @@ -31,9 +31,7 @@ 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: > @@ -62,7 +60,7 @@ 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); > } > > /* > @@ -72,12 +70,10 @@ 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; > } > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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