dma-debug cleanup and dynamic allocation

Hi all,

Here's some assorted cleanup and improvements to dma-debug which grew out of the problem that certain drivers use very large numbers of DMA mappings, and knowing when to override "dma_debug_entries=..." and what value to override it with can be a less-than-obvious task for users.

The main part is patch #4, wherein we make dma-debug clever enough to allocate more entries dynamically if needed, such that the preallocation value becomes more of a quality-of-life option than a necessity. Patches #5 and #6 do some cruft-removal to allow patch #7 to make the allocation behaviour more efficient in general.

Patches #1, #2 and #4 are some other cleanup and handy features which fell out of the discussion/development.

Robin.

Robin Murphy (7):
dma-debug: Use pr_fmt()
dma-debug: Expose nr_total_entries in debugfs
dma-debug: Dynamically expand the dma_debug_entry pool
dma-debug: Make leak-like behaviour apparent x86/dma/amd-gart: Stop resizing dma_debug_entry pool dma/debug: Remove dma_debug_resize_entries()
dma-debug: Batch dma_debug_entry allocation

 Documentation/DMA-API.txt                 |  20 +-
 Documentation/x86/x86_64/boot-options.txt |   5 +-
 arch/x86/kernel/amd_gart_64.c             |  23 ---
 include/linux/dma-debug.h                 |   7 -
 kernel/dma/debug.c                        | 217 ++++++++++------------
 5 files changed, 109 insertions(+), 163 deletions(-)

2.19.1.dirty