Re: [PATCH v5 0/6] x86/apic: Fix restoring boot irq mode in reboot and kexec/kdump

[Ingo Molnar]

* Baoquan He <bhe@xxxxxxxxxx> wrote:

> This is v5 post. Newly added patch 0002 includes the change
> related to KEXEC_JUMP path. Patch 0003 only includes the
> regression fix.
> 
> A regression bug was introduced in below commit.
> commit 522e66464467 ("x86/apic: Disable I/O APIC before shutdown of the local APIC")
> 
> It caused the action to fail that we try to restore boot irq mode
> in reboot and kexec/kdump. Details can be seen in patch 0003.
> 
> Warning can always be seen during kdump kernel boot on qemu/kvm
> platform. Our customer even saw casual kdump kernel hang once in
> ~30 attempts during stress testing of kdump on KVM machine.
> 
> v4->v5:
>   Take out the change related to KEXEC_JUMP to a new patch 0002
>   according to Eric's suggestion.
>   Patch 0003 in this series only includes the regression fix.
> 
> v3->v4:
>   Eric pointed out that in patch 0002 the change related to
>   KEXEC_JUMP is not right.
>   Correct it.
> 
>   Add Fixes tag and Cc to stable.

Eric, are these patches looking good to you now?

Thanks,

	Ingo