Re: [Ext2-devel] [PATCH 1/2] ext2/3: Support 2^32-1 blocks(Kernel)

[Takashi Sato]

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 
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