linux-kernel - Re: [patch 01/15] x86/irq: Convey vector as argument and not in ptregs

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Date:   Thu, 27 Feb 2020 00:50:35 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Brian Gerst <brgerst@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Juergen Gross <JGross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [patch 01/15] x86/irq: Convey vector as argument and not in ptregs

Andy Lutomirski <luto@...capital.net> writes:
>> On Feb 26, 2020, at 12:13 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
>> Brian Gerst <brgerst@...il.com> writes:
>> Now the question is whether we care about the packed stubs or just make
>> them larger by using alignment to get rid of this silly +0x80 and
>> ~vector fixup later on. The straight forward thing clearly has its charm
>> and I doubt it matters in measurable ways.
>
> I agree it probably doesn’t matter. That being said, I have a distinct
> memory of fixing that asm so it would fail the build if the alignment
> was off.

Hrm. Doesn't look like. Gah, and I love the hardcoded  * 8 in the IDT
code. Let me add something to catch such things in the future.

Thanks,

        tglx