linux-kernel - Re: [-mm][PATCH 0/2] Memory rlimit fix crash on fork

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Message-Id: <20080812171407.2f468729.akpm@linux-foundation.org>
Date:	Tue, 12 Aug 2008 17:14:07 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, skumar@...ux.vnet.ibm.com,
	yamamoto@...inux.co.jp, menage@...gle.com, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, nishimura@....nes.nec.co.jp,
	xemul@...nvz.org, hugh@...itas.com, balbir@...ux.vnet.ibm.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [-mm][PATCH 0/2] Memory rlimit fix crash on fork

On Mon, 11 Aug 2008 15:37:19 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> --- linux-2.6.27-rc1/mm/memory.c~memrlimit-fix-crash-on-fork	2008-08-11 14:57:48.000000000 +0530
> +++ linux-2.6.27-rc1-balbir/mm/memory.c	2008-08-11 14:58:33.000000000 +0530
> @@ -901,8 +901,12 @@ unsigned long unmap_vmas(struct mmu_gath

^^ returns a long.

>  	unsigned long start = start_addr;
>  	spinlock_t *i_mmap_lock = details? details->i_mmap_lock: NULL;
>  	int fullmm = (*tlbp)->fullmm;
> -	struct mm_struct *mm = vma->vm_mm;
> +	struct mm_struct *mm;
> +
> +	if (!vma)
> +		return;

^^ mm/memory.c:907: warning: 'return' with no value, in function returning non-void

How does this happen?

I'll drop the patch.  The above mystery change needs a comment, IMO.
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