linux-kernel - Re: [PATCH 1/5] mm/vmalloc.c: correct a few logic error for __insert_vmap

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Date:   Tue, 27 Sep 2016 14:07:02 +0800
From:   zijun_hu <zijun_hu@...o.com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, zijun_hu@....com,
        Andrew Morton <akpm@...ux-foundation.org>, tj@...nel.org,
        mingo@...nel.org, iamjoonsoo.kim@....com,
        mgorman@...hsingularity.net
Subject: Re: [PATCH 1/5] mm/vmalloc.c: correct a few logic error for
 __insert_vmap_area()

On 09/22/2016 07:15 AM, David Rientjes wrote:
> On Thu, 22 Sep 2016, zijun_hu wrote:
> 
>>> We don't support inserting when va->va_start == tmp_va->va_end, plain and 
>>> simple.  There's no reason to do so.  NACK to the patch.
>>>
>> i am sorry i disagree with you because
>> 1) in almost all context of vmalloc, original logic treat the special case as normal
>>    for example, __find_vmap_area() or alloc_vmap_area()
> 
> The ranges are [start, end) like everywhere else.  __find_vmap_area() is 
> implemented as such for the passed address.  The address is aligned in 
> alloc_vmap_area(), there's no surprise here.  The logic is correct in 
> __insert_vmap_area().
> 
i am sorry to disagree with you
i will resend this patch with more detailed illustration