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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
This commit is contained in:
Dou Liyang 2018-05-23 10:35:55 +08:00 committed by Thomas Gleixner
parent cce2946b9b
commit 3366281288
1 changed files with 2 additions and 5 deletions
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7
arch/x86/kernel/idt.c
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@ -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
}
/**