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186f43608a
Historically a lot of these existed because we did not have a distinction between what was modular code and what was providing support to modules via EXPORT_SYMBOL and friends. That changed when we forked out support for the latter into the export.h file. This means we should be able to reduce the usage of module.h in code that is obj-y Makefile or bool Kconfig. The advantage in doing so is that module.h itself sources about 15 other headers; adding significantly to what we feed cpp, and it can obscure what headers we are effectively using. Since module.h was the source for init.h (for __init) and for export.h (for EXPORT_SYMBOL) we consider each obj-y/bool instance for the presence of either and replace as needed. Build testing revealed some implicit header usage that was fixed up accordingly. Note that some bool/obj-y instances remain since module.h is the header for some exception table entry stuff, and for things like __init_or_module (code that is tossed when MODULES=n). Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20160714001901.31603-4-paul.gortmaker@windriver.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
44 lines
966 B
C
44 lines
966 B
C
/*
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* 8253/PIT functions
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*
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*/
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#include <linux/clockchips.h>
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#include <linux/init.h>
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#include <linux/timex.h>
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#include <linux/i8253.h>
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#include <asm/hpet.h>
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#include <asm/time.h>
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#include <asm/smp.h>
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/*
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* HPET replaces the PIT, when enabled. So we need to know, which of
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* the two timers is used
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*/
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struct clock_event_device *global_clock_event;
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void __init setup_pit_timer(void)
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{
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clockevent_i8253_init(true);
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global_clock_event = &i8253_clockevent;
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}
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#ifndef CONFIG_X86_64
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static int __init init_pit_clocksource(void)
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{
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/*
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* Several reasons not to register PIT as a clocksource:
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*
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* - On SMP PIT does not scale due to i8253_lock
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* - when HPET is enabled
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* - when local APIC timer is active (PIT is switched off)
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*/
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if (num_possible_cpus() > 1 || is_hpet_enabled() ||
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!clockevent_state_periodic(&i8253_clockevent))
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return 0;
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return clocksource_i8253_init();
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}
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arch_initcall(init_pit_clocksource);
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#endif /* !CONFIG_X86_64 */
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