Re: Possible shared mapping bug in 2.4.23 (at least MIPS/Sparc)

[Jamie Lokier]

Peter Horton wrote:
> A quick look at sparc and sparc64 seem to show the same problem.

D-cache incoherence with unsuitably aligned multiple MAP_FIXED
mappings is also observed on SH4, SH5, PA-RISC 1.1d.  The kernel may
have the same behaviour on those platforms: allowing a mapping that
should not be allowed.

On some ARM and m68k boxes, incoherence is observed independent of
alignment, for multiple mappings of a page in the same user memory
space.

-- Jamie

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