linux-kernel - Re: [PATCH 1/2] livepatch: Remove custom kobject state handling

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Message-Id: <20190503163500.GC14216@JAVRIS.in.ibm.com>
Date:   Fri, 3 May 2019 22:05:00 +0530
From:   Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        "Tobin C . Harding" <tobin@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] livepatch: Remove custom kobject state handling

On Fri, May 03, 2019 at 03:26:24PM +0200, Petr Mladek wrote:
> kobject_init() always succeeds and sets the reference count to 1.
> It allows to always free the structures via kobject_put() and
> the related release callback.
> 
> Note that the custom kobject state handling was used only
> because we did not know that kobject_put() can and actually
> should get called even when kobject_init_and_add() fails.
> 
> The patch should not change the existing behavior.
> 
> Suggested-by: "Tobin C. Harding" <tobin@...nel.org>
> Signed-off-by: Petr Mladek <pmladek@...e.com>
> ---
>  include/linux/livepatch.h |  3 ---
>  kernel/livepatch/core.c   | 56 ++++++++++++++---------------------------------
>  2 files changed, 17 insertions(+), 42 deletions(-)
> 
> diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
> index 53551f470722..a14bab1a0a3e 100644
> --- a/include/linux/livepatch.h
> +++ b/include/linux/livepatch.h
> @@ -86,7 +86,6 @@ struct klp_func {
>  	struct list_head node;
>  	struct list_head stack_node;
>  	unsigned long old_size, new_size;
> -	bool kobj_added;
>  	bool nop;
>  	bool patched;
>  	bool transition;

Minor nitpick, the description of kobj_added needs to be removed from
structure descriptions. 

Reviewed-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>

-- 
Kamalesh