[PATCH v2 2/3] drm/print: Improve drm_dbg_printer

[Michal Wajdeczko]

With recent introduction of a generic drm dev printk function, we
can now store and use location where drm_dbg_printer was invoked
and output it's symbolic name like we do for all drm debug prints.

Cc: Jani Nikula <jani.nikula at intel.com>
Reviewed-by: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
---
v2: use full cast to match member (Jani)
---
 drivers/gpu/drm/drm_print.c | 3 +--
 include/drm/drm_print.h     | 2 ++
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index 41892491a12c..35d00f0c6d64 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -217,8 +217,7 @@ void __drm_printfn_dbg(struct drm_printer *p, struct va_format *vaf)
 	if (!__drm_debug_enabled(category))
 		return;
 
-	/* Note: __builtin_return_address(0) is useless here. */
-	__drm_dev_vprintk(dev, KERN_DEBUG, NULL, p->prefix, vaf);
+	__drm_dev_vprintk(dev, KERN_DEBUG, p->origin, p->prefix, vaf);
 }
 EXPORT_SYMBOL(__drm_printfn_dbg);
 
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index 089950ad8681..bfc5641c6025 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -175,6 +175,7 @@ struct drm_printer {
 	void (*printfn)(struct drm_printer *p, struct va_format *vaf);
 	void (*puts)(struct drm_printer *p, const char *str);
 	void *arg;
+	const void *origin;
 	const char *prefix;
 	enum drm_debug_category category;
 };
@@ -332,6 +333,7 @@ static inline struct drm_printer drm_dbg_printer(struct drm_device *drm,
 	struct drm_printer p = {
 		.printfn = __drm_printfn_dbg,
 		.arg = drm,
+		.origin = (const void *)_THIS_IP_, /* it's fine as we will be inlined */
 		.prefix = prefix,
 		.category = category,
 	};
-- 
2.43.0