Add some basic resume trace facilities
Considering that there isn't a lot of hw we can depend on during resume,
this is about as good as it gets.
This is x86-only for now, although the basic concept (and most of the
code) will certainly work on almost any platform.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index ce0dfb8..cdf315e 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -36,6 +36,15 @@
code. This is helpful when debugging and reporting various PM bugs,
like suspend support.
+config PM_TRACE
+ bool "Suspend/resume event tracing"
+ depends on PM && PM_DEBUG && X86
+ default y
+ ---help---
+ This enables some cheesy code to save the last PM event point in the
+ RTC across reboots, so that you can debug a machine that just hangs
+ during suspend (or more commonly, during resume).
+
config SOFTWARE_SUSPEND
bool "Software Suspend"
depends on PM && SWAP && (X86 && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP)