PageReserved removal from swsusp

[Nick Piggin <nickpiggin@yahoo.com.au>]

Hi,

kernel/power/swsusp.c is the last remaining real user of PageReserved
with my current PageReserved removal patchset. This is actually not a
problem for my purposes, and swsusp is quite able to continue using
PageReserved... however that may be a bit ugly, and means swsusp will
be the sole user of 3(!) page-flags.

The PageReserved test in save_highmem_zone() is the hard one. rvmalloc
is no problem, but it seems to be important to prevent saving regions
that aren't RAM.

I seem to be able to work around this on i386 by testing page_is_ram()
instead of PageReserved, however that looks nonportable, and at least
on i386 we rather want something like page_is_usable_ram() which is
(page_is_ram && !(bad_ppro && page_kills_ppro))

Otherwise we could perhaps have a PageUsableRAM() which returns
page->flags != 0xffffffff or some other unlikely combination of flags.

They're my two ideas. Anyone else?

-- 
SUSE Labs, Novell Inc.

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