Date: Mon, 29 Mar 2004 15:50:55 -0800
From: Paul Jackson <pj@sgi.com>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: colpatch@us.ibm.com, linux-kernel@vger.kernel.org, mbligh@aracnet.com,
       akpm@osdl.org, haveblue@us.ibm.com
Subject: Re: [PATCH] mask ADT: bitmap and bitop tweaks [1/22]
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> No, not those two. xor of 0's is 0 again. and of 0 and anything is 0 again.

I agree with Bill on this.


> It looks like Paul wants those invariants.

No - bitmap wants these invariants, and I wanted bitmap to be
consistent.  It's an exposed API in its own right.  Since it mostly
already had filtering of unused bits on Boolean/scalar ops, and
avoidance of setting unused bits on proper calls, I completed that
model.

For masks, I promise not to set them if you don't screw up, but I don't
add any code to protect against such, and I don't hestitate to presume
the unused bits are always zero whenever it is convenient to do so.

-- 
                          I won't rest till it's the best ...
                          Programmer, Linux Scalability
                          Paul Jackson <pj@sgi.com> 1.650.933.1373
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