linux-kernel - Re: [PATCH 3/3] livepatch: force transition process to finish

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Message-ID: <20170518131608.GG9599@fm.suse>
Date:   Thu, 18 May 2017 15:16:08 +0200
From:   Libor Pechacek <lpechacek@...e.com>
To:     Miroslav Benes <mbenes@...e.cz>
Cc:     jpoimboe@...hat.com, jeyu@...hat.com, jikos@...nel.org,
        pmladek@...e.com, live-patching@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] livepatch: force transition process to finish

On Thu 18-05-17 14:00:43, Miroslav Benes wrote:
[...]
> Admin can do that now by writing 2 to force sysfs attribute in livepatch
> sysfs directory. TIF_PATCH_PENDING is then cleared for all tasks and the
> transition can finish successfully.
[...]
> --- a/include/linux/livepatch.h
> +++ b/include/linux/livepatch.h
> @@ -31,6 +31,7 @@
>  
>  /* values for sysfs force attribute */
>  #define KLP_FORCE_FAKE		1
> +#define KLP_FORCE_UNMARK	2

Again, needs documentation. I would consider using symbolic names instead of
numbers, like /sys/power/state does, even more friendly. Possibility to read a
list of available actions would help user space tools identify what is
available in case the list grows in the future.

Libor
-- 
Libor Pechacek
SUSE Labs