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From: Ingo Oeser <ioe-lkml@axxeo.de>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Linux Kernel ML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2.6] fix mprotect() with len=(size_t)(-1) to return -ENOMEM
Date: Mon, 14 Mar 2005 22:58:01 +0100	[thread overview]
Message-ID: <200503142258.01611.ioe-lkml@axxeo.de> (raw)
In-Reply-To: <1110794932.6288.58.camel@laptopd505.fenrus.org>

Hi Arjan,

You wrote:
> shouldn't we just fix the alignment code instead that the overflow case
> doesn't align to 0???
> that sounds really odd.

How? You have to align and you are out of bits for representing the
next number. What is the next number you can round to? "null" right!

Just remember that integer math with limited bits is always ring math ;-)

I love to abuse this for buffers and save an if.

Regards

Ingo Oeser




  reply	other threads:[~2005-03-14 22:02 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-03-14  9:55 Gordon Jin
2005-03-14 10:08 ` Arjan van de Ven
2005-03-14 21:58   ` Ingo Oeser [this message]
2005-03-15  3:04 ` [PATCH 2.6] fix mmap() return value to conform POSIX Gordon Jin

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