[dpdk-dev] [PATCH v4 1/2] eal: make base address hint OS-specific

[Burakov, Anatoly]

On 02-Oct-19 3:42 PM, Stephen Hemminger wrote:
> On Wed, 2 Oct 2019 13:41:30 +0200
> David Marchand <david.marchand at redhat.com> wrote:
> 
>>> +uint64_t eal_get_baseaddr(void)
>>> +{
>>> +       /*
>>> +        * Linux kernel uses a really high address as starting address for
>>> +        * serving mmaps calls. If there exists addressing limitations and IOVA
>>> +        * mode is VA, this starting address is likely too high for those
>>> +        * devices. However, it is possible to use a lower address in the
>>> +        * process virtual address space as with 64 bits there is a lot of
>>> +        * available space.
>>> +        *
>>> +        * Current known limitations are 39 or 40 bits. Setting the starting
>>> +        * address at 4GB implies there are 508GB or 1020GB for mapping the
>>> +        * available hugepages. This is likely enough for most systems, although
>>> +        * a device with addressing limitations should call
>>> +        * rte_mem_check_dma_mask for ensuring all memory is within supported
>>> +        * range.
>>> +        */
>>> +       return 0x100000000;
> 
> Is this going to work right on 32  bit builds where sizeof(uint) == 4
> then constants default to 32. Does it need ul or ull suffix (or a cast)?
> 

Adding ULL in v2, thanks.

-- 
Thanks,
Anatoly