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List: linux-newbie
Subject: Re: [PATCH 12/12] x86: Use struct fields instead of bitmasks
From: Jeremy Fitzhardinge <jeremy () goop ! org>
Date: 2008-10-29 12:56:00
Message-ID: 49085D60.7050807 () goop ! org
[Download RAW message or body]
Joe Damato wrote:
> Use fields in structs instead of bitmasks for getting/setting descriptor data.
>
> Signed-off-by: Joe Damato <ice799@gmail.com>
> ---
> drivers/lguest/interrupts_and_traps.c | 6 +++---
> 1 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c
> index bfb24d9..0d9c065 100644
> --- a/drivers/lguest/interrupts_and_traps.c
> +++ b/drivers/lguest/interrupts_and_traps.c
> @@ -178,7 +178,7 @@ void maybe_do_interrupt(struct lg_cpu *cpu)
> * over them. */
> idt = &cpu->arch.idt[FIRST_EXTERNAL_VECTOR+irq];
> /* If they don't have a handler (yet?), we just ignore it */
> - if (idt_present(idt->a, idt->b)) {
> + if (idt->p) {
>
No, using an idt_present() accessor is better, but just pass it an idt.
> /* OK, mark it no longer pending and deliver it. */
> clear_bit(irq, cpu->irqs_pending);
> /* set_guest_interrupt() takes the interrupt descriptor and a
> @@ -254,7 +254,7 @@ int deliver_trap(struct lg_cpu *cpu, unsigned int num)
>
> /* Early on the Guest hasn't set the IDT entries (or maybe it put a
> * bogus one in): if we fail here, the Guest will be killed. */
> - if (!idt_present(cpu->arch.idt[num].a, cpu->arch.idt[num].b))
> + if (!cpu->arch.idt[num].p)
> return 0;
> set_guest_interrupt(cpu, desc_lo(cpu->arch.idt[num]),
> desc_hi(cpu->arch.idt[num]), has_err(num));
> @@ -461,7 +461,7 @@ void copy_traps(const struct lg_cpu *cpu, gate_desc *idt,
> * If it can't go direct, we still need to copy the priv. level:
> * they might want to give userspace access to a software
> * interrupt. */
> - if (idt_type(gidt->a, gidt->b) == 0xF)
> + if (gidt->type == 0xF)
>
We should have symbolic names for the IDT types.
J
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