linux-kernel - [PATCH 2/2] drm_print: fix stale macro-name in comment

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Message-Id: <20221205161005.222274-3-jim.cromie@gmail.com>
Date:   Mon,  5 Dec 2022 09:10:05 -0700
From:   Jim Cromie <jim.cromie@...il.com>
To:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org
Cc:     jani.nikula@...el.com, ville.syrjala@...ux.intel.com,
        daniel.vetter@...ll.ch, seanpaul@...omium.org, robdclark@...il.com,
        Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH 2/2] drm_print: fix stale macro-name in comment

Cited commit uses stale macro name, fix this, and explain better.

When DRM_USE_DYNAMIC_DEBUG=y, DYNDBG_CLASSMAP_DEFINE() maps DRM_UT_*
onto BITs in drm.debug.  This still uses enum drm_debug_category, but
it is somewhat indirect, with the ordered set of DRM_UT_* enum-vals.
This requires that the macro args: DRM_UT_* list must be kept in sync
and in order.

Fixes: f158936b60a7 ("drm: POC drm on dyndbg - use in core, 2 helpers, 3 drivers.")
Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
. emphasize ABI non-change despite enum val change - Jani Nikula
. reorder to back of patchset to follow API name changes.
---
 include/drm/drm_print.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index a44fb7ef257f..e4c0c7e6d49d 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -276,7 +276,10 @@ static inline struct drm_printer drm_err_printer(const char *prefix)
  *
  */
 enum drm_debug_category {
-	/* These names must match those in DYNAMIC_DEBUG_CLASSBITS */
+	/*
+	 * Keep DYNDBG_CLASSMAP_DEFINE args in sync with changes here,
+	 * the enum-values define BIT()s in drm.debug, so are ABI.
+	 */
 	/**
 	 * @DRM_UT_CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c,
 	 * drm_memory.c, ...
-- 
2.38.1