linux-kernel - Re: [PATCH v2 01/11] xen/manage: keep track of the on-going suspend mode

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Message-ID: <66a9b838-70ed-0807-9260-f2c31343a081@oracle.com>
Date:   Mon, 27 Jul 2020 18:08:29 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Stefano Stabellini <sstabellini@...nel.org>,
        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, 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 v2 01/11] xen/manage: keep track of the on-going suspend
 mode

On 7/24/20 7:01 PM, Stefano Stabellini wrote:
> Yes, it does, thank you. I'd rather not introduce unknown regressions so
> I would recommend to add an arch-specific check on registering
> freeze/thaw/restore handlers. Maybe something like the following:
>
> #ifdef CONFIG_X86
>     .freeze = blkfront_freeze,
>     .thaw = blkfront_restore,
>     .restore = blkfront_restore
> #endif
>
>
> maybe Boris has a better suggestion on how to do it


An alternative might be to still install pm notifier in
drivers/xen/manage.c (I think as result of latest discussions we decided
we won't need it) and return -ENOTSUPP for ARM for
PM_HIBERNATION_PREPARE and friends. Would that work?


-boris