linux-kernel - Re: [PATCH 9/9] mm/oom_kill: remove weird use of ERR_PTR()/PTR

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Date:	Sun, 16 Jun 2013 11:11:46 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 9/9] mm/oom_kill: remove weird use of
 ERR_PTR()/PTR_ERR().

On Sun, 16 Jun 2013, Rusty Russell wrote:

> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index 79e451a..f9b9cd7 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -288,7 +288,7 @@ enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
>  
>  /*
>   * Simple selection loop. We chose the process with the highest
> - * number of 'points'.
> + * number of 'points'.  Returns -1 on scan abort.
>   *
>   * (not docbooked, we don't want this one cluttering up the manual)
>   */
> @@ -314,7 +314,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
>  			continue;
>  		case OOM_SCAN_ABORT:
>  			rcu_read_unlock();
> -			return ERR_PTR(-1UL);
> +			return (void *)(-1UL);
>  		case OOM_SCAN_OK:
>  			break;
>  		};

Any reason it's not struct task_struct *?

> @@ -657,7 +657,7 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
>  		dump_header(NULL, gfp_mask, order, NULL, mpol_mask);
>  		panic("Out of memory and no killable processes...\n");
>  	}
> -	if (PTR_ERR(p) != -1UL) {
> +	if (p != (void *)-1UL) {
>  		oom_kill_process(p, gfp_mask, order, points, totalpages, NULL,
>  				 nodemask, "Out of memory");
>  		killed = 1;
--
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