netdev - Re: [PATCH v3 01/11] xen/manage: keep track of the on-going suspend mode

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Date:   Tue, 22 Sep 2020 12:18:05 -0400
From:   boris.ostrovsky@...cle.com
To:     Anchal Agarwal <anchalag@...zon.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        x86@...nel.org, jgross@...e.com, linux-pm@...r.kernel.org,
        linux-mm@...ck.org, kamatam@...zon.com, sstabellini@...nel.org,
        konrad.wilk@...cle.com, roger.pau@...rix.com, axboe@...nel.dk,
        davem@...emloft.net, rjw@...ysocki.net, len.brown@...el.com,
        pavel@....cz, peterz@...radead.org, eduval@...zon.com,
        sblbir@...zon.com, xen-devel@...ts.xenproject.org,
        vkuznets@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, dwmw@...zon.co.uk,
        benh@...nel.crashing.org
Subject: Re: [PATCH v3 01/11] xen/manage: keep track of the on-going suspend
 mode


On 9/21/20 5:54 PM, Anchal Agarwal wrote:
> Thanks for the above suggestion. You are right I didn't find a way to declare
> a global state either. I just broke the above check in 2 so that once we have
> support for ARM we should be able to remove aarch64 condition easily. Let me
> know if I am missing nay corner cases with this one.
>
> static int xen_pm_notifier(struct notifier_block *notifier,
> 	unsigned long pm_event, void *unused)
> {
>     int ret = NOTIFY_OK;
>     if (!xen_hvm_domain() || xen_initial_domain())
> 	ret = NOTIFY_BAD;
>     if(IS_ENABLED(CONFIG_ARM64) && (pm_event == PM_SUSPEND_PREPARE || pm_event == HIBERNATION_PREPARE))
> 	ret = NOTIFY_BAD;
>
>     return ret;
> }



This will allow PM suspend to proceed on x86.


-boris