linux-kernel - Re: [PATCH v2 1/2] x86/apic/kexec: Enable legacy irq mode before jump to kexec/kdump kernel

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Date:   Thu, 8 Feb 2018 20:34:18 +0800
From:   Baoquan He <bhe@...hat.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, douly.fnst@...fujitsu.com,
        joro@...tes.org, uobergfe@...hat.com, prarit@...hat.com
Subject: Re: [PATCH v2 1/2] x86/apic/kexec: Enable legacy irq mode before
 jump to kexec/kdump kernel

On 02/07/18 at 01:48pm, Eric W. Biederman wrote:
> ebiederm@...ssion.com (Eric W. Biederman) writes:

> > Now that I see that I agree in essence with this patch series.
> > I don't agree with the implemenation details.
> >
> > Can you please split disable_IO_APIC and switch_to_legacy_irq_mode
> > in a single patch.
> 
> Now that I think about it can you call the function not
> switch_to_legacy_irq_mode but restore_boot_irq_mode.  And the
> corresponding x86_io_apic_ops not .disable but .restore.
> 
> That should make the purpose of the code clearer, and help avoid
> mistakes like the one that led to this regression.

Thanks for your comments and great suggestion. Have made change as you
suggested, will post after test passed.

Thanks
Baoquan