ACPI: create CONFIG_ACPI_DEBUG_FUNC_TRACE

Split ACPI_DEBUG into function trace enabled and not enabled.

Function trace is most of the ACPI_DEBUG costs, but is
not much of use for kernel ACPI debugging.

Size of kernel image increased on test compile:
+ 48k  (Full ACPI_DEBUG)
+ 35k  (ACPI_DEBUG with function trace compiled out)

Performance without function trace is also much better.

Also remove ACPI_LV_DEBUG_OBJECT from default debug level as
a lot vendors let Store (value, debug) in their code and this
might confuse users when it pops up in syslog.

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 139f41f033d8..1121a1f4b5d7 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -280,6 +280,14 @@ config ACPI_DEBUG
           of verbosity. Saying Y enables these statements. This will increase
           your kernel size by around 50K.
 
+config ACPI_DEBUG_FUNC_TRACE
+        bool "Additionally enable ACPI function tracing"
+        default n
+        depends on ACPI_DEBUG
+        help
+          ACPI Debug Statements slow down ACPI processing. Function trace
+          is about half of the penalty and is rarely useful.
+
 config ACPI_EC
         bool
         default y