[linux-sh:01860] [linuxsh-dev] 2.4.7 unaligned user space access problems

[NIIBE Y. <gn...@m1...>]

I've just commited tha patch, please try it out.

My main development is SH7750 SolutionEngine, and I don't see this
issue.  Getting your report, I've tested CqREEK SH-4 and see the
problem.  I don't know why I didn't see the problem in SolutionEngine, 
perhaps some memory timing issue or so.

I've confirmed that the cause of this problem is interrupt.  The code
I've tested is like this:

	save_and_cli(flags);
	if (open) __sti();
	/* cache flush procedure ... */
	restore_flage(flags);

When I set open==1, I see "unaligend memory access" while open==0
works fine.

My guess is after we clear out the cache address memory, we need to
guarantee we don't use the cache for some period.
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