Re: 2.3.19 vgacon change

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 5 Oct 1999 11:08:08 +0100 (BST)

> Was this change necessary? Not all implementations of scr_readw are
> implemented as volatile references. The pointer should be cast to
> volatile in the implementation of scr_readw(), not in the code itself.

A lot of the time you don't want the ordering and other performance loss
caused by volatility when drawing on the screen. You don't actually care
if a box is drawn in a slightly odd pixel order for example

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