X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FKconfig.debug;h=900b63c1e899efc48c07d2126c2cf1451eca799f;hb=32665f2bbfed2e325d37236d9b0071a11a69124e;hp=db25707aa41bc021b8174391091178b85258d466;hpb=3981560c2a8acae1a66cbf319f8ca1c92dde8f4d;p=firefly-linux-kernel-4.4.55.git

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index db25707aa41b..900b63c1e899 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -761,6 +761,15 @@ config PANIC_ON_OOPS_VALUE
 	default 0 if !PANIC_ON_OOPS
 	default 1 if PANIC_ON_OOPS
 
+config PANIC_TIMEOUT
+	int "panic timeout"
+	default 0
+	help
+	  Set the timeout value (in seconds) until a reboot occurs when the
+	  the kernel panics. If n = 0, then we wait forever. A timeout
+	  value n > 0 will wait n seconds before rebooting, while a timeout
+	  value n < 0 will reboot immediately.
+
 config SCHED_DEBUG
 	bool "Collect scheduler debugging info"
 	depends on DEBUG_KERNEL && PROC_FS
@@ -1575,8 +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.
 
 source "samples/Kconfig"