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Commit a933c618 authored by Cyrill Gorcunov's avatar Cyrill Gorcunov Committed by Ingo Molnar
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x86, apic: Use apic noop driver 



In case if apic were disabled we may use the whole apic NOOP driver
instead of sparse poking the some functions in apic driver.

Also NOOP would catch any inappropriate apic operation calls (not
just read/write).

Signed-off-by: default avatarCyrill Gorcunov <gorcunov@openvz.org>
Cc: yinghai@kernel.org
Cc: macro@linux-mips.org
LKML-Reference: <20091013201022.747817361@openvz.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 9844ab11

arch/x86/kernel/apic/apic.c

+3 −19
Original line number Diff line number Diff line
@@ -241,28 +241,12 @@ static int modern_apic(void) 
}



/*

 * bare function to substitute write operation

 * and it's _that_ fast :)

 */

static void native_apic_write_dummy(u32 reg, u32 v)

{

	WARN_ON_ONCE((cpu_has_apic || !disable_apic));

}



static u32 native_apic_read_dummy(u32 reg)

{

	WARN_ON_ONCE((cpu_has_apic && !disable_apic));

	return 0;

}



/*

 * right after this call apic->write/read doesn't do anything

 * note that there is no restore operation it works one way

 * right after this call apic become NOOP driven

 * so apic->write/read doesn't do anything

 */

void apic_disable(void)

{

	apic->read = native_apic_read_dummy;

	apic->write = native_apic_write_dummy;

	apic = &apic_noop;

}



void native_apic_wait_icr_idle(void)