drm: Reduce object size of DRM_ERROR and DRM_DEBUG uses

drm_printk is used for both DRM_ERROR and DRM_DEBUG with unnecessary
arguments that can be removed by creating separate functins.

Create specific functions for these calls to reduce x86/64 defconfig
size by ~20k.

Modify the existing macros to use the specific calls.

new:
$ size -t drivers/gpu/drm/built-in.a | tail -1
1876562	  44542	    995	19220999	 1d5433	(TOTALS)

old:
$ size -t drivers/gpu/drm/built-in.a | tail -1
1897565	  44542	    995	1943102	 1da63e	(TOTALS)

Miscellanea:

o intel_display requires a change to use the specific calls.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/016b5cb84cede20fd0f91ed6965421d99fd5f2ce.1520978414.git.joe@perches.com

drivers/gpu/drm/drm_print.c

@@ -89,23 +89,37 @@ void drm_dev_printk(const struct device *dev, const char *level,
 }
 EXPORT_SYMBOL(drm_dev_printk);
 
-void drm_printk(const char *level, unsigned int category,
-		const char *format, ...)
+void drm_dbg(unsigned int category, const char *format, ...)
 {
 	struct va_format vaf;
 	va_list args;
 
-	if (category != DRM_UT_NONE && !(drm_debug & category))
+	if (!(drm_debug & category))
 		return;
 
 	va_start(args, format);
 	vaf.fmt = format;
 	vaf.va = &args;
 
-	printk("%s" "[" DRM_NAME ":%ps]%s %pV",
-	       level, __builtin_return_address(0),
-	       strcmp(level, KERN_ERR) == 0 ? " *ERROR*" : "", &vaf);
+	printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
+	       __builtin_return_address(0), &vaf);
+
+	va_end(args);
+}
+EXPORT_SYMBOL(drm_dbg);
+
+void drm_err(const char *format, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, format);
+	vaf.fmt = format;
+	vaf.va = &args;
+
+	printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
+	       __builtin_return_address(0), &vaf);
 
 	va_end(args);
 }
-EXPORT_SYMBOL(drm_printk);
+EXPORT_SYMBOL(drm_err);

drivers/gpu/drm/i915/intel_display.c

@@ -11001,24 +11001,17 @@ intel_compare_link_m_n(const struct intel_link_m_n *m_n,
 static void __printf(3, 4)
 pipe_config_err(bool adjust, const char *name, const char *format, ...)
 {
-	char *level;
-	unsigned int category;
 	struct va_format vaf;
 	va_list args;
 
-	if (adjust) {
-		level = KERN_DEBUG;
-		category = DRM_UT_KMS;
-	} else {
-		level = KERN_ERR;
-		category = DRM_UT_NONE;
-	}
-
 	va_start(args, format);
 	vaf.fmt = format;
 	vaf.va = &args;
 
-	drm_printk(level, category, "mismatch in %s %pV", name, &vaf);
+	if (adjust)
+		drm_dbg(DRM_UT_KMS, "mismatch in %s %pV", name, &vaf);
+	else
+		drm_err("mismatch in %s %pV", name, &vaf);
 
 	va_end(args);
 }

include/drm/drm_print.h

@@ -200,9 +200,10 @@ __printf(6, 7)
 void drm_dev_printk(const struct device *dev, const char *level,
 		    unsigned int category, const char *function_name,
 		    const char *prefix, const char *format, ...);
-__printf(3, 4)
-void drm_printk(const char *level, unsigned int category,
-		const char *format, ...);
+__printf(2, 3)
+void drm_dbg(unsigned int category, const char *format, ...);
+__printf(1, 2)
+void drm_err(const char *format, ...);
 
 /* Macros to make printk easier */
 
@@ -236,7 +237,7 @@ void drm_printk(const char *level, unsigned int category,
 	drm_dev_printk(dev, KERN_ERR, DRM_UT_NONE, __func__, " *ERROR*",\
 		       fmt, ##__VA_ARGS__)
 #define DRM_ERROR(fmt, ...)						\
-	drm_printk(KERN_ERR, DRM_UT_NONE, fmt,	##__VA_ARGS__)
+	drm_err(fmt, ##__VA_ARGS__)
 
 /**
  * Rate limited error output.  Like DRM_ERROR() but won't flood the log.
@@ -279,40 +280,40 @@ void drm_printk(const char *level, unsigned int category,
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_CORE, __func__, "", fmt,	\
 		       ##args)
 #define DRM_DEBUG(fmt, ...)						\
-	drm_printk(KERN_DEBUG, DRM_UT_CORE, fmt, ##__VA_ARGS__)
+	drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)
 
 #define DRM_DEV_DEBUG_DRIVER(dev, fmt, args...)				\
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_DRIVER, __func__, "",	\
 		       fmt, ##args)
 #define DRM_DEBUG_DRIVER(fmt, ...)					\
-	drm_printk(KERN_DEBUG, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
+	drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
 
 #define DRM_DEV_DEBUG_KMS(dev, fmt, args...)				\
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_KMS, __func__, "", fmt,	\
 		       ##args)
 #define DRM_DEBUG_KMS(fmt, ...)						\
-	drm_printk(KERN_DEBUG, DRM_UT_KMS, fmt, ##__VA_ARGS__)
+	drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
 
 #define DRM_DEV_DEBUG_PRIME(dev, fmt, args...)				\
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_PRIME, __func__, "",	\
 		       fmt, ##args)
 #define DRM_DEBUG_PRIME(fmt, ...)					\
-	drm_printk(KERN_DEBUG, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
+	drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)
 
 #define DRM_DEV_DEBUG_ATOMIC(dev, fmt, args...)				\
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ATOMIC, __func__, "",	\
 		       fmt, ##args)
 #define DRM_DEBUG_ATOMIC(fmt, ...)					\
-	drm_printk(KERN_DEBUG, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
+	drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
 
 #define DRM_DEV_DEBUG_VBL(dev, fmt, args...)				\
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_VBL, __func__, "", fmt,	\
 		       ##args)
 #define DRM_DEBUG_VBL(fmt, ...)						\
-	drm_printk(KERN_DEBUG, DRM_UT_VBL, fmt, ##__VA_ARGS__)
+	drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)
 
 #define DRM_DEBUG_LEASE(fmt, ...)					\
-	drm_printk(KERN_DEBUG, DRM_UT_LEASE, fmt, ##__VA_ARGS__)
+	drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)
 
 #define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, level, fmt, args...)	\
 ({									\