Hi, Matthew!
I got a funny result from the hugepages selftest when trying to break
out some functionality from shmem to make a ttm page pool for
cached-only TTM system bos.
It turns out that shmem computed the pagesizes using the underlying
pages rather than the dma segments, so when I changed that, hugepages
started failing.
https://patchwork.freedesktop.org/series/91227/
But when hacking the page-size computation to use the underlying pages,
it's fine again
https://patchwork.freedesktop.org/series/91336/
It seems like some assumption about huge dma segments is wrong, either
in our page-size calculation, in the selftest or in the actual huge page
setup. Could it be that huge sized segments are assumed to be properly
aligned?
/Thomas
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