Commit 33662812 authored May 23, 2018 by Dou Liyang Committed by Thomas Gleixner Jun 06, 2018

x86/idt: Simplify the idt_setup_apic_and_irq_gates()



The idt_setup_apic_and_irq_gates() sets the gates from
FIRST_EXTERNAL_VECTOR up to FIRST_SYSTEM_VECTOR first. then secondly, from
FIRST_SYSTEM_VECTOR to NR_VECTORS, it takes both APIC=y and APIC=n into
account.

But for APIC=n, the FIRST_SYSTEM_VECTOR is equal to NR_VECTORS, all
vectors has been set at the first step.

Simplify the second step, make it just work for APIC=y.

Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20180523023555.2933-1-douly.fnst@cn.fujitsu.com

parent cce2946b

arch/x86/kernel/idt.c

+2 −5

Original line number	Diff line number	Diff line
		@@ -317,15 +317,12 @@ void __init idt_setup_apic_and_irq_gates(void)
		set_intr_gate(i, entry);
		}

		for_each_clear_bit_from(i, system_vectors, NR_VECTORS) {
		#ifdef CONFIG_X86_LOCAL_APIC
		for_each_clear_bit_from(i, system_vectors, NR_VECTORS) {
		set_bit(i, system_vectors);
		set_intr_gate(i, spurious_interrupt);
		#else
		entry = irq_entries_start + 8 * (i - FIRST_EXTERNAL_VECTOR);
		set_intr_gate(i, entry);
		#endif
		}
		#endif
		}

		/**

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