dc8fb2f282
As part of pin_user_pages() and related API calls, pages are "dma-pinned". For the case of compound pages of order > 1, the per-page accounting of dma pins is accomplished via the 3rd struct page in the compound page. In order to support debugging of any pin_user_pages()- related problems, enhance dump_page() so as to report the pin count in that case. Documentation/core-api/pin_user_pages.rst is also updated accordingly. Signed-off-by: John Hubbard <jhubbard@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.cz> Cc: Matthew Wilcox <willy@infradead.org> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Link: http://lkml.kernel.org/r/20200211001536.1027652-13-jhubbard@nvidia.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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assoc_array.rst | ||
atomic_ops.rst | ||
boot-time-mm.rst | ||
cachetlb.rst | ||
circular-buffers.rst | ||
cpu_hotplug.rst | ||
debug-objects.rst | ||
errseq.rst | ||
genalloc.rst | ||
generic-radix-tree.rst | ||
genericirq.rst | ||
gfp_mask-from-fs-io.rst | ||
idr.rst | ||
index.rst | ||
kernel-api.rst | ||
kobject.rst | ||
librs.rst | ||
local_ops.rst | ||
memory-allocation.rst | ||
memory-hotplug.rst | ||
mm-api.rst | ||
packing.rst | ||
padata.rst | ||
pin_user_pages.rst | ||
printk-formats.rst | ||
protection-keys.rst | ||
refcount-vs-atomic.rst | ||
symbol-namespaces.rst | ||
timekeeping.rst | ||
tracepoint.rst | ||
workqueue.rst | ||
xarray.rst |