linux-kernel - Re: [PATCH v8 4/8] livepatch: Allow to unpatch only functions of the given type

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Date:   Thu, 22 Feb 2018 16:25:07 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Petr Mladek <pmladek@...e.com>
cc:     Jiri Kosina <jikos@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jason Baron <jbaron@...mai.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Jessica Yu <jeyu@...nel.org>,
        Evgenii Shatokhin <eshatokhin@...tuozzo.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 4/8] livepatch: Allow to unpatch only functions of
 the given type

On Wed, 21 Feb 2018, Petr Mladek wrote:

> From: Jason Baron <jbaron@...mai.com>
> 
> We are going to add a feature called atomic replace. It will allow to
> create a patch that would replace all already registered patches.
> For this, we will need to dynamically create funcs and objects
> for functions that are no longer patched.
> 
> The dynamically allocated objects will not longer be needed once
> the patch is applied.
> 
> This patch allows to unpatch functions of the given type. It might
> cause that the obj->patched flag is true even when some listed
> functions are not longer patched. This is fine as long as the
> unpatched funcs' structures are removed right after. It will
> be the case. Anyway, it is safe. In the worst case, it will
> not be possible to enable the disabled functions.
> 
> Signed-off-by: Jason Baron <jbaron@...mai.com>
> [pmladek@...e.com: Split and modified to use the generic ftype]
> Signed-off-by: Petr Mladek <pmladek@...e.com>
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Cc: Jessica Yu <jeyu@...nel.org>
> Cc: Jiri Kosina <jikos@...nel.org>
> Cc: Miroslav Benes <mbenes@...e.cz>

Acked-by: Miroslav Benes <mbenes@...e.cz>

Miroslav