From: "Ilpo Järvinen" <redacted>
Date: Sat, 28 Feb 2009 16:44:39 +0200

From: Ilpo Järvinen <redacted>

In the pure assignment case, the earlier zeroing is
still in effect.

Signed-off-by: Ilpo Järvinen <redacted>

I skipped this one.

These tests could be there to avoid dirtying a cacheline
when unnecessary.  And so unless we can prove the condition
always hits and we always do the write, we should keep
the tests there.