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    Subject[PATCH 13/37] PM: Make PM_TRACE more architecture independent
    Date
    From: Johannes Berg <johannes@sipsolutions.net>

    When trying to debug a suspend failure I started implementing
    PM_TRACE for powerpc. I then noticed that I'm debugging a suspend
    failure and so PM_TRACE isn't useful at all, but thought that
    nonetheless this could be useful in the future.

    Basically, to support PM_TRACE, you add a Kconfig option that
    selects PM_TRACE and provides the infrastructure as per the
    help text of PM_TRACE.

    Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
    Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
    Signed-off-by: Len Brown <len.brown@intel.com>
    ---
    drivers/base/power/Makefile | 2 +-
    kernel/power/Kconfig | 23 ++++++++++++++++++++++-
    2 files changed, 23 insertions(+), 2 deletions(-)
    diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile
    index de28dfd..911208b 100644
    --- a/drivers/base/power/Makefile
    +++ b/drivers/base/power/Makefile
    @@ -1,6 +1,6 @@
    obj-$(CONFIG_PM) += sysfs.o
    obj-$(CONFIG_PM_SLEEP) += main.o
    -obj-$(CONFIG_PM_TRACE) += trace.o
    +obj-$(CONFIG_PM_TRACE_RTC) += trace.o

    ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
    ccflags-$(CONFIG_PM_VERBOSE) += -DDEBUG
    diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
    index 8e186c6..06a08f7 100644
    --- a/kernel/power/Kconfig
    +++ b/kernel/power/Kconfig
    @@ -44,9 +44,30 @@ config PM_VERBOSE
    ---help---
    This option enables verbose messages from the Power Management code.

    +config CAN_PM_TRACE
    + def_bool y
    + depends on PM_DEBUG && PM_SLEEP && EXPERIMENTAL
    +
    config PM_TRACE
    + bool
    + help
    + This enables code to save the last PM event point across
    + reboot. The architecture needs to support this, x86 for
    + example does by saving things in the RTC, see below.
    +
    + The architecture specific code must provide the extern
    + functions from <linux/resume-trace.h> as well as the
    + <asm/resume-trace.h> header with a TRACE_RESUME() macro.
    +
    + The way the information is presented is architecture-
    + dependent, x86 will print the information during a
    + late_initcall.
    +
    +config PM_TRACE_RTC
    bool "Suspend/resume event tracing"
    - depends on PM_DEBUG && X86 && PM_SLEEP && EXPERIMENTAL
    + depends on CAN_PM_TRACE
    + depends on X86
    + select PM_TRACE
    default n
    ---help---
    This enables some cheesy code to save the last PM event point in the
    --
    1.5.4.rc5.16.gc0279


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