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>

3 files changed, 33 insertions, 2 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
diff --git a/include/acpi/acmacros.h b/include/acpi/acmacros.h
index 8948a6461834..c22f6da6d372 100644
--- a/include/acpi/acmacros.h
+++ b/include/acpi/acmacros.h
@@ -486,6 +486,8 @@
 #define ACPI_FUNCTION_NAME(name)
 #endif
 
+#ifdef DEBUG_FUNC_TRACE
+
 #define ACPI_FUNCTION_TRACE(a)          ACPI_FUNCTION_NAME(a) \
                           acpi_ut_trace(ACPI_DEBUG_PARAMETERS)
 #define ACPI_FUNCTION_TRACE_PTR(a,b)    ACPI_FUNCTION_NAME(a) \
@@ -563,6 +565,27 @@
 
 #endif                          /* ACPI_SIMPLE_RETURN_MACROS */
 
+#else /* !DEBUG_FUNC_TRACE */
+
+#define ACPI_FUNCTION_TRACE(a)
+#define ACPI_FUNCTION_TRACE_PTR(a,b)
+#define ACPI_FUNCTION_TRACE_U32(a,b)
+#define ACPI_FUNCTION_TRACE_STR(a,b)
+#define ACPI_FUNCTION_EXIT
+#define ACPI_FUNCTION_STATUS_EXIT(s)
+#define ACPI_FUNCTION_VALUE_EXIT(s)
+#define ACPI_FUNCTION_TRACE(a)
+#define ACPI_FUNCTION_ENTRY()
+
+#define return_VOID                     return
+#define return_ACPI_STATUS(s)           return(s)
+#define return_VALUE(s)                 return(s)
+#define return_UINT8(s)                 return(s)
+#define return_UINT32(s)                return(s)
+#define return_PTR(s)                   return(s)
+
+#endif /* DEBUG_FUNC_TRACE */
+
 /* Conditional execution */
 
 #define ACPI_DEBUG_EXEC(a)              a
diff --git a/include/acpi/acoutput.h b/include/acpi/acoutput.h
index 7812267b577f..c090a8b0bc99 100644
--- a/include/acpi/acoutput.h
+++ b/include/acpi/acoutput.h
@@ -178,8 +178,8 @@
 
 /* Defaults for debug_level, debug and normal */
 
-#define ACPI_DEBUG_DEFAULT          (ACPI_LV_INIT | ACPI_LV_WARN | ACPI_LV_ERROR | ACPI_LV_DEBUG_OBJECT)
-#define ACPI_NORMAL_DEFAULT         (ACPI_LV_INIT | ACPI_LV_WARN | ACPI_LV_ERROR | ACPI_LV_DEBUG_OBJECT)
+#define ACPI_DEBUG_DEFAULT          (ACPI_LV_INIT | ACPI_LV_WARN | ACPI_LV_ERROR)
+#define ACPI_NORMAL_DEFAULT         (ACPI_LV_INIT | ACPI_LV_WARN | ACPI_LV_ERROR)
 #define ACPI_DEBUG_ALL              (ACPI_LV_AML_DISASSEMBLE | ACPI_LV_ALL_EXCEPTIONS | ACPI_LV_ALL)
 
 #endif                          /* __ACOUTPUT_H__ */