Re: [PATCH v6 11/15] mm, fs, dax: handle layout changes to pinned dax mappings

Hi Dan, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.16-rc5 next-20180316] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url:

Re: [PATCH v6 11/15] mm, fs, dax: handle layout changes to pinned dax mappings

Looks good (at least up to my comprehension of the mm code :)) Reviewed-by: Christoph Hellwig ___ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm

[PATCH v6 11/15] mm, fs, dax: handle layout changes to pinned dax mappings

Background: get_user_pages() in the filesystem pins file backed memory pages for access by devices performing dma. However, it only pins the memory pages not the page-to-file offset association. If a file is truncated the pages are mapped out of the file and dma may continue indefinitely into a