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

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Message-ID: <48A237B8.6060004@linux.vnet.ibm.com>
Date:	Wed, 13 Aug 2008 06:54:08 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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, kamezawa.hiroyu@...fujitsu.com
Subject: Re: [-mm][PATCH 0/2] Memory rlimit fix crash on fork

Andrew Morton wrote:
> 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.

Oops.. I'll send the updated version. I'll comment it as well.

-- 
	Balbir
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