linux-kernel - Re: [PATCH] Fix end_of_stack() fn and location of stack canary for archs using STACK

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Date:	Fri, 19 Sep 2014 12:21:37 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Chuck Ebbert <cebbert.lkml@...il.com>, Helge Deller <deller@....de>
CC:	<linux-kernel@...r.kernel.org>, <linux-parisc@...r.kernel.org>,
	"Aaron Tomlin" <atomlin@...hat.com>,
	linux-metag <linux-metag@...r.kernel.org>
Subject: Re: [PATCH] Fix end_of_stack() fn and location of stack canary for
 archs using STACK_GROWSUP

Hi Chuck,

On 16/09/14 08:37, Chuck Ebbert wrote:
>  static inline unsigned long *end_of_stack(struct task_struct *p)
>  {
> +#ifdef CONFIG_STACK_GROWSUP
> +	return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1;

Nit: this line should probably be wrapped to 80 columns.

Other than that, I've tested this on metag and can confirm that it fixes
the following BUG which you would otherwise get during boot with Aaron's
patches:

BUG: failure at kernel/sched/core.c:2664/schedule_debug()!
Kernel panic - not syncing: BUG!

Tested-by: James Hogan <james.hogan@...tec.com> [metag]
Acked-by: James Hogan <james.hogan@...tec.com>

Aaron: please can you try to get this patch applied before your patch
series.

Thanks
James
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