linux-kernel - Re: [PATCH v3 2/2] livepatch: force transition process to finish

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Message-ID: <20171101153204.GH20040@pathway.suse.cz>
Date:   Wed, 1 Nov 2017 16:32:04 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Miroslav Benes <mbenes@...e.cz>
Cc:     jpoimboe@...hat.com, jeyu@...nel.org, jikos@...nel.org,
        lpechacek@...e.cz, pavel@....cz, live-patching@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] livepatch: force transition process to finish

On Tue 2017-10-31 12:48:53, Miroslav Benes wrote:
> If a task sleeps in a set of patched functions uninterruptedly, it could
> block the whole transition process indefinitely.  Thus it may be useful
> to clear its TIF_PATCH_PENDING to allow the process to finish.
> 
> Admin can do that now by writing to force sysfs attribute in livepatch
> sysfs directory. TIF_PATCH_PENDING is then cleared for all tasks and the
> transition can finish successfully.
> 
> Important note! Use wisely. Admin must be sure that it is safe to
> execute such action. This means that it must be checked that by doing so
> the consistency model guarantees are not violated.
> 
> Signed-off-by: Miroslav Benes <mbenes@...e.cz>

If no animals were harmed when developing this brute force then
feel free to use:

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr