linux-kernel - Re: [RFC][PATCH] mm: Remove ZERO_SIZE

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Message-Id: <201002260838.o1Q8cfr2068194@www262.sakura.ne.jp>
Date:	Fri, 26 Feb 2010 17:38:41 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	kosaki.motohiro@...fujitsu.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] mm: Remove ZERO_SIZE_PTR.

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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