Diffstat (limited to 'lib/Kconfig.debug')
1 files changed, 10 insertions, 2 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 6982094a7e74..900b63c1e899 100644
@@ -1584,8 +1584,16 @@ config DMA_API_DEBUG
With this option you will be able to detect common bugs in device
drivers like double-freeing of DMA mappings or freeing mappings that
were never allocated.
- This option causes a performance degredation. Use only if you want
- to debug device drivers. If unsure, say N.
+ This also attempts to catch cases where a page owned by DMA is
+ accessed by the cpu in a way that could cause data corruption. For
+ example, this enables cow_user_page() to check that the source page is
+ not undergoing DMA.
+ This option causes a performance degradation. Use only if you want to
+ debug device drivers and dma interactions.
+ If unsure, say N.