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ACPI, x86/boot: Split out acpi_generic_reduce_hw_init() and export 

This is a preparation patch to allow override the hardware reduced
initialization on ACPI enabled platforms.

No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-acpi@vger.kernel.org
Link: http://lkml.kernel.org/r/20180220180506.65523-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Shevchenko 2018-02-20 20:05:04 +02:00 committed by Ingo Molnar
parent 24c517856a
commit 50beba07a0
2 changed files with 17 additions and 9 deletions
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4
arch/x86/include/asm/acpi.h
View File

@ -140,6 +140,8 @@ static inline u64 acpi_arch_get_root_pointer(void)
return x86_init.acpi.get_root_pointer();
}
void acpi_generic_reduced_hw_init(void);
#else /* !CONFIG_ACPI */
#define acpi_lapic 0
@ -149,6 +151,8 @@ static inline void acpi_noirq_set(void) { }
static inline void acpi_disable_pci(void) { }
static inline void disable_acpi(void) { }
static inline void acpi_generic_reduced_hw_init(void) { }
#endif /* !CONFIG_ACPI */
#define ARCH_HAS_POWER_INIT 1

22
arch/x86/kernel/acpi/boot.c
View File

@ -1376,17 +1376,21 @@ static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
*
* We initialize the Hardware-reduced ACPI model here:
*/
void __init acpi_generic_reduced_hw_init(void)
{
/*
* Override x86_init functions and bypass legacy PIC in
* hardware reduced ACPI mode.
*/
x86_init.timers.timer_init = x86_init_noop;
x86_init.irqs.pre_vector_init = x86_init_noop;
legacy_pic = &null_legacy_pic;
}
static void __init acpi_reduced_hw_init(void)
{
if (acpi_gbl_reduced_hardware) {
/*
* Override x86_init functions and bypass legacy pic
* in Hardware-reduced ACPI mode
*/
x86_init.timers.timer_init = x86_init_noop;
x86_init.irqs.pre_vector_init = x86_init_noop;
legacy_pic = &null_legacy_pic;
}
if (acpi_gbl_reduced_hardware)
acpi_generic_reduced_hw_init();
}
/*