Message-ID: <06f301c64c06$b820f440$4168010a@bsd.tnes.nec.co.jp>
From: "Takashi Sato" <sho@bsd.tnes.nec.co.jp>
To: "Theodore Ts'o" <tytso@mit.edu>
Cc: <linux-kernel@vger.kernel.org>, <ext2-devel@lists.sourceforge.net>
References: <000301c6482d$7e5b5200$4168010a@bsd.tnes.nec.co.jp> <20060319022002.GA19607@thunk.org>
Subject: Re: [Ext2-devel] [PATCH 1/2] ext2/3: Support 2^32-1 blocks(Kernel)
Date: Mon, 20 Mar 2006 19:11:51 +0900
MIME-Version: 1.0
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1174
Lines: 30

Hi,

> I've just checked my i386 assembly language reference, and I don't see
> any indication that the btsl, btrl, and btl instructions don't work if
> the high bit is set on the bit number.  Have you done tests showing
> that these instructions do not work correctly for filesystem sizes >
> 2**31 blocks, 

Of course I did and confirmed to get the segmentation fault
at those instructions.

>                          or have references showing that these instructions
> interpret the bit number as a signed integer?

I got the developer's manual from the following site.
ftp://download.intel.com/design/Pentium4/manuals/25366618.pdf
There is the description of "See also: Bit(BitBase, BitOffset) on page 3-10"
on the explanation of "bts" at page 3-82.

"Table 3-2. Range of Bit Positions Specified by Bit Offset Operands"
 at page 3-10 says that the register bit offset is restricted
from -2^31 to 2^31 - 1.

--
Takashi Sato 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/