Messages in this thread | | | Date | Tue, 9 Oct 2012 18:00:12 -0700 | Subject | Re: [PATCH 2/3] x86, mm: Don't clear page table if next range is ram | From | Yinghai Lu <> |
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On Tue, Oct 9, 2012 at 8:46 AM, Konrad Rzeszutek Wilk <konrad@kernel.org> wrote: >> + !e820_any_mapped(addr & PAGE_MASK, next, 0)) > > What is the 0 parameter for?
any type
if type != 0, the will only check entries with same type.
int e820_any_mapped(u64 start, u64 end, unsigned type) { int i;
for (i = 0; i < e820.nr_map; i++) { struct e820entry *ei = &e820.map[i];
if (type && ei->type != type) continue; if (ei->addr >= end || ei->addr + ei->size <= start) continue; return 1; } return 0; }
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