Re: lib/klist.c: bit 0 in pointer can't be used as flag

[David Miller]

From: Jesper Nilsson <jesper.nilsson@xxxxxxxx>
Date: Tue, 13 Jan 2009 16:14:06 +0100

> The commit a1ed5b0cffe4b16a93a6a3390e8cee0fbef94f86
> (klist: don't iterate over deleted entries) introduces use of the
> low bit in a pointer to indicate if the knode is dead or not,
> assuming that this bit is always free.
> 
> This is not true for all architectures, CRIS for example may align data
> on byte borders.

There are many other spots in the kernel where the low bits of a
pointer are hijacked as status bits.  Lots of other things cannot
possible be working on CRIS because of this.
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