Re: [linuxsh-dev] BUG fix for VMALLOC-ed page

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

SH-4 TLB has feature to "wire" the entry (never been flush out, kind
of executive class seat).  It could be used for accesssing Area 5 or
Area 6 as PCMCIA.  I think that it's fair enough to allocate wired
entries for PCMCIA.  If accessing I/O would cause TLB-miss, it's hard
for device drivers writer to implement routines.  Most drivers are
not ready, I guess, and not required to be so.

When some machine designer implements hardware initialization routine
in BIOS to enable "wired" TLB entries, we should not ignore these
entries.  We should be conservative here.

I think that there're certainly such cases, it's very similar to BSC
setting.

This is our point.  See?
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