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xen: clean up "extra" memory handling some more

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Make sure that extra_pages is added for all E820_RAM regions beyond
mem_end - completely excluded regions as well as the remains of partially
included regions.

Also makes sure the extra region is not unnecessarily high, and simplifies
the logic to decide which regions should be added.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge 2010-11-22 16:31:35 -08:00
parent 1233471572
commit c2d0879112
1 changed files with 9 additions and 12 deletions
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21
arch/x86/xen/setup.c
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@ -182,24 +182,21 @@ char * __init xen_memory_setup(void)
for (i = 0; i < memmap.nr_entries; i++) {
unsigned long long end = map[i].addr + map[i].size;
if (map[i].type == E820_RAM) {
if (map[i].addr < mem_end && end > mem_end) {
/* Truncate region to max_mem. */
u64 delta = end - mem_end;
if (map[i].type == E820_RAM && end > mem_end) {
/* RAM off the end - may be partially included */
u64 delta = min(map[i].size, end - mem_end);
map[i].size -= delta;
extra_pages += PFN_DOWN(delta);
map[i].size -= delta;
end -= delta;
end = mem_end;
}
extra_pages += PFN_DOWN(delta);
}
if (end > xen_extra_mem_start)
if (map[i].size > 0 && end > xen_extra_mem_start)
xen_extra_mem_start = end;
/* If region is non-RAM or below mem_end, add what remains */
if ((map[i].type != E820_RAM || map[i].addr < mem_end) &&
map[i].size > 0)
/* Add region if any remains */
if (map[i].size > 0)
e820_add_region(map[i].addr, map[i].size, map[i].type);
}