Re: linux-2.1.115 on alpha: bug in memsetw_io (or memset_c_io)

Richard Henderson (rth@dot.cygnus.com)
Sat, 8 Aug 1998 17:37:40 -0700

On Fri, Aug 07, 1998 at 03:52:52PM +0400, Alexander V. Lukyanov wrote:
> I tracked it down to memsetw_io which is just a macro to memset_c_io.
> BUT memsetw_io is used to clear video memory with two-byte sequence
> (character/attribute), and memset_c_io clears with _single_ byte
> on non-aligned margins. The consequence of that is clearing with
> green color (' '=0x20) instead of current attribute.

I'd seen these before, but not tracked down what the problem was. Thanks!

Martin, I think it is a bug in the console code that an unaligned
address was ever given to scr_memsetw. The characters in video
memory are always aligned, therefore we must have an off-by-one bug.

I'll have a peek for this myself, but you can find it just as easy
as I by instrumenting your kernel.

r~

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