linux-kernel - Re: [PATCH] mm: negative left shift count when PAGE

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Message-Id: <20130718143928.4f9b45807956e2fdb1ee3a22@linux-foundation.org>
Date:	Thu, 18 Jul 2013 14:39:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jerry <uulinux@...il.com>
Cc:	zhuwei.lu@...hermind.com, tianfu.huang@...hermind.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: negative left shift count when PAGE_SHIFT > 20

On Fri, 19 Jul 2013 00:56:12 +0800 Jerry <uulinux@...il.com> wrote:

> When PAGE_SHIFT > 20, the result of "20 - PAGE_SHIFT" is negative. The
> calculating here will generate an unexpected result. In addition, if
> PAGE_SHIFT > 20, The memory size represented by numentries was already
> integral multiple of 1MB.
> 

If you tell me that you have a machine which has PAGE_SIZE=2MB and this
was the only problem which prevented Linux from running on that machine
then I'll apply the patch ;)

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