On 09/22/2016 07:15 AM, David Rientjes wrote:

On Thu, 22 Sep 2016, zijun_hu wrote:

quoted

quoted

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


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