[RFC PATCH 13/17] drm_print: fix stale macro-name in comment

[Daniel Vetter]

On Mon, Dec 05, 2022 at 05:34:20PM -0700, Jim Cromie wrote:
> 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 at gmail.com>

Should I land this already?
-Daniel

> ---
> . 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 6a27e8f26770..7695ba31b3a4 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
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch