linux-kernel - Re: [PATCH 07/10] res_counter: Allow charge failure pointer to be null

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Date:	Tue, 4 Oct 2011 04:30:34 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Menage <paul@...lmenage.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Aditya Kali <adityakali@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Tim Hockin <thockin@...kin.org>, Tejun Heo <tj@...nel.org>,
	Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH 07/10] res_counter: Allow charge failure pointer to be
 null

On Mon, Oct 03, 2011 at 09:07:09PM +0200, Frederic Weisbecker wrote:
> So that callers of res_counter_charge() don't have to create and
> pass this pointer even if they aren't interested in it.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>

Acked-by: Kirill A. Shutemov <kirill@...temov.name>

> Cc: Paul Menage <paul@...lmenage.org>
> Cc: Li Zefan <lizf@...fujitsu.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Aditya Kali <adityakali@...gle.com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Kay Sievers <kay.sievers@...y.org>
> Cc: Tim Hockin <thockin@...kin.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Kirill A. Shutemov <kirill@...temov.name>
> Cc: Containers <containers@...ts.linux-foundation.org>
> ---
>  kernel/res_counter.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/res_counter.c b/kernel/res_counter.c
> index 8f4c728..6b36823 100644
> --- a/kernel/res_counter.c
> +++ b/kernel/res_counter.c
> @@ -43,14 +43,16 @@ int res_counter_charge_until(struct res_counter *counter,
>  	unsigned long flags;
>  	struct res_counter *c, *u;
>  
> -	*limit_fail_at = NULL;
> +	if (limit_fail_at)
> +		*limit_fail_at = NULL;
>  	local_irq_save(flags);
>  	for (c = counter; c != limit; c = c->parent) {
>  		spin_lock(&c->lock);
>  		ret = res_counter_charge_locked(c, val);
>  		spin_unlock(&c->lock);
>  		if (ret < 0) {
> -			*limit_fail_at = c;
> +			if (limit_fail_at)
> +				*limit_fail_at = c;
>  			goto undo;
>  		}
>  	}
> -- 
> 1.7.5.4
> 

-- 
 Kirill A. Shutemov
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