Re: [PATCH 9/9] mm/oom_kill: remove weird use ofERR_PTR()/PTR_ERR().

From: David Rientjes
Date: Sun Jun 16 2013 - 14:11:52 EST


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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