dma-debug: Make leak-like behaviour apparent

[linux-2.6-block.git] / Documentation / DMA-API.txt

diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt
index 0fcb7561af1e83c83673a0b7ec4a884482edd527..7a7d8a415ce84cb46c3d4e84daa72c427b8c70de 100644 (file)
--- a/Documentation/DMA-API.txt
+++ b/Documentation/DMA-API.txt
@@ -747,7 +747,11 @@ driver afterwards. This filter can be disabled or changed later using debugfs.
 When the code disables itself at runtime this is most likely because it ran
 out of dma_debug_entries and was unable to allocate more on-demand. 65536
 entries are preallocated at boot - if this is too low for you boot with
-'dma_debug_entries=<your_desired_number>' to overwrite the default.
+'dma_debug_entries=<your_desired_number>' to overwrite the default. The
+code will print to the kernel log each time it has dynamically allocated
+as many entries as were initially preallocated. This is to indicate that a
+larger preallocation size may be appropriate, or if it happens continually
+that a driver may be leaking mappings.
 
 ::