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    Subject[patch-mm 17/33] i386: prepare sharing the PIT code
    PIT clock events work already and the PIT handling is the same for
    i386 and x86_64. x86_64 does not support PIT as a clock source, so
    disable the PIT clocksource for x86_64.

    Prepare i8253.h to be shared with x8664

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>

    ---
    arch/i386/kernel/i8253.c | 3 +++
    include/asm-i386/i8253.h | 6 ++++--
    2 files changed, 7 insertions(+), 2 deletions(-)

    Index: linux-2.6.22-rc6-mm/arch/i386/kernel/i8253.c
    ===================================================================
    --- linux-2.6.22-rc6-mm.orig/arch/i386/kernel/i8253.c 2007-07-15 17:26:45.000000000 +0200
    +++ linux-2.6.22-rc6-mm/arch/i386/kernel/i8253.c 2007-07-15 17:39:21.000000000 +0200
    @@ -120,6 +120,7 @@ void __init setup_pit_timer(void)
    global_clock_event = &pit_clockevent;
    }

    +#ifndef CONFIG_X86_64
    /*
    * Since the PIT overflows every tick, its not very useful
    * to just read by itself. So use jiffies to emulate a free
    @@ -204,3 +205,5 @@ static int __init init_pit_clocksource(v
    return clocksource_register(&clocksource_pit);
    }
    arch_initcall(init_pit_clocksource);
    +
    +#endif
    Index: linux-2.6.22-rc6-mm/include/asm-i386/i8253.h
    ===================================================================
    --- linux-2.6.22-rc6-mm.orig/include/asm-i386/i8253.h 2007-07-15 17:26:45.000000000 +0200
    +++ linux-2.6.22-rc6-mm/include/asm-i386/i8253.h 2007-07-15 17:48:50.000000000 +0200
    @@ -1,8 +1,6 @@
    #ifndef __ASM_I8253_H__
    #define __ASM_I8253_H__

    -#include <linux/clockchips.h>
    -
    /* i8253A PIT registers */
    #define PIT_MODE 0x43
    #define PIT_CH0 0x40
    @@ -10,8 +8,12 @@

    extern spinlock_t i8253_lock;

    +#ifdef CONFIG_GENERIC_CLOCKEVENTS
    +
    extern struct clock_event_device *global_clock_event;

    extern void setup_pit_timer(void);

    +#endif
    +
    #endif /* __ASM_I8253_H__ */
    --

    -
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