Re: [RFC][PATCH] mm: Remove ZERO_SIZE_PTR.

[Tetsuo Handa]

KOSAKI Motohiro wrote:
> > Therefore, at the cost of being unable to distinguish "NULL pointer
> > dereference" and "ZERO_SIZE_PTR dereference" in some cases, removing
> > ZERO_SIZE_PTR could reduce the risk of "ZERO_SIZE_PTR dereference" in many
> > cases.
> 
> NAK. yes, it could. but it is no worth. nobody want slower kernel.
> 
This patch simplifies error checks of both callers/callees from

	((unsigned long)(x) <= (unsigned long) 16)

to

	!(x)

. Why this patch makes the kernel slower?
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