On Mon, Aug 17, 2009 at 03:23:18PM -0500, Aguirre Rodriguez, Sergio Alberto
wrote:
> #ifndef CONFIG_SPARSEMEM
> int pfn_valid(unsigned long pfn)
> {
> struct meminfo *mi = &meminfo;
> unsigned int left = 0, right = mi->nr_banks;
>
> while (left <= right) {
This condition will cause the while to loop forever when left == right
and pfn < bank_pfn_start(bank).
> unsigned int mid = (right - left) / 2;
This calculation is incorrect when left != 0 (also in the original
patch).
> struct membank *bank = &mi->bank[mid];
>
> if (pfn < bank_pfn_start(bank))
> right = mid;
> else if (pfn >= bank_pfn_end(bank))
> left = mid + 1;
> else
> return 1;
> }
> return 0;
> }
> EXPORT_SYMBOL(pfn_valid);
> #endif
Here's a fixed version:
int pfn_valid(unsigned long pfn)
{
struct meminfo *mi = &meminfo;
unsigned int left = 0, right = mi->nr_banks;
while (left < right) {
unsigned int mid = (left + right) / 2;
struct membank *bank = &mi->bank[mid];
if (pfn < bank_pfn_start(bank))
right = mid;
else if (pfn >= bank_pfn_end(bank))
left = mid + 1;
else
return 1;
}
return 0;
}
Rabin
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