Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is notenough ram for it

From: Yinghai Lu
Date: Fri Jan 04 2013 - 14:57:17 EST

On Fri, Jan 4, 2013 at 8:05 AM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
>> +static bool __init enough_mem_for_swiotlb(void)
>> +{
>> + /* do we have less than 1M RAM under 4G ? */
> And why 1MB? The default size is 64MB.

because kdump scripts will use memmap=exact,.. to add range below 1M
to get realmode data.
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