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DMM: Fix for movable bytes near end of address space

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To prevent overflow near 4GB memory address, the rounding down of
memory addresses needs to be propagated to the memory hotplug logic.
Checking if a given pfn is part of physical ram allows us to do this.
Also while walking through system ram, we need to take care of
overflow at high memory address.

Change-Id: Id962cf93906888783a807fe89f2be4ba91b2c5d6
Signed-off-by: Hanumant Singh <hanumant@codeaurora.org>
(cherry picked from commit 28976a80e961f491e51c1cb627311efc4981b69a)

Conflicts:

	drivers/base/memory.c
This commit is contained in:
Hanumant Singh 2012-04-18 14:14:21 -07:00 committed by Stephen Boyd
parent c8921c51d8
commit 8c04289245
1 changed files with 8 additions and 2 deletions
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10
kernel/resource.c
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@ -402,12 +402,18 @@ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
while ((res.start < res.end) &&
(find_next_system_ram(&res, "System RAM") >= 0)) {
pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT;
end_pfn = (res.end + 1) >> PAGE_SHIFT;
if (res.end + 1 <= 0)
end_pfn = res.end >> PAGE_SHIFT;
else
end_pfn = (res.end + 1) >> PAGE_SHIFT;
if (end_pfn > pfn)
ret = (*func)(pfn, end_pfn - pfn, arg);
if (ret)
break;
res.start = res.end + 1;
if (res.end + 1 > res.start)
res.start = res.end + 1;
else
res.start = res.end;
res.end = orig_end;
}
return ret;