From: Jim Cromie <jim.cromie@gmail.com>
To: linux-kernel@vger.kernel.org, jbaron@akamai.com,
gregkh@linuxfoundation.org, dri-devel@lists.freedesktop.org,
amd-gfx@lists.freedesktop.org,
intel-gvt-dev@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org
Cc: daniel.vetter@ffwll.ch, seanpaul@chromium.org
Subject: [PATCH v5 29/33] drm_print: prefer bare printk KERN_DEBUG on generic fn
Date: Fri, 5 Aug 2022 15:53:51 -0600 [thread overview]
Message-ID: <20220805215355.3509287-30-jim.cromie@gmail.com> (raw)
In-Reply-To: <20220805215355.3509287-1-jim.cromie@gmail.com>
drm_print.c calls pr_debug() just once, from __drm_printfn_debug(),
which is a generic/service fn. The callsite is compile-time enabled
by DEBUG in both DYNAMIC_DEBUG=y/n builds.
For dyndbg builds, reverting this callsite back to bare printk is
correcting a few anti-features:
1- callsite is generic, serves multiple drm users.
it is soft-wired on currently by #define DEBUG
could accidentally: #> echo -p > /proc/dynamic_debug/control
2- optional "decorations" by dyndbg are unhelpful/misleading here,
they describe only the generic site, not end users
IOW, 1,2 are unhelpful at best, and possibly confusing.
reverting yields a nominal data and text shrink:
text data bss dec hex filename
462583 36604 54592 553779 87333 /kernel/drivers/gpu/drm/drm.ko
462515 36532 54592 553639 872a7 -dirty/kernel/drivers/gpu/drm/drm.ko
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
drivers/gpu/drm/drm_print.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index cb203d63b286..ec477c44a784 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -23,8 +23,6 @@
* Rob Clark <robdclark@gmail.com>
*/
-#define DEBUG /* for pr_debug() */
-
#include <linux/stdarg.h>
#include <linux/io.h>
@@ -185,7 +183,8 @@ EXPORT_SYMBOL(__drm_printfn_info);
void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
{
- pr_debug("%s %pV", p->prefix, vaf);
+ /* pr_debug callsite decorations are unhelpful here */
+ printk(KERN_DEBUG "%s %pV", p->prefix, vaf);
}
EXPORT_SYMBOL(__drm_printfn_debug);
--
2.37.1
next prev parent reply other threads:[~2022-08-05 22:00 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-05 21:53 [PATCH v5 00/33] DYNDBG: opt-in class'd debug for modules, use in drm Jim Cromie
2022-08-05 21:53 ` [PATCH v5 01/33] dyndbg: fix static_branch manipulation Jim Cromie
2022-08-05 21:53 ` [PATCH v5 02/33] dyndbg: fix module.dyndbg handling Jim Cromie
2022-08-05 21:53 ` [PATCH v5 03/33] dyndbg: show both old and new in change-info Jim Cromie
2022-08-05 21:53 ` [PATCH v5 04/33] dyndbg: reverse module walk in cat control Jim Cromie
2022-08-05 21:53 ` [PATCH v5 05/33] dyndbg: reverse module.callsite " Jim Cromie
2022-08-05 21:53 ` [PATCH v5 06/33] dyndbg: use ESCAPE_SPACE for " Jim Cromie
2022-08-05 21:53 ` [PATCH v5 07/33] dyndbg: let query-modname override actual module name Jim Cromie
2022-08-05 21:53 ` [PATCH v5 08/33] dyndbg: add test_dynamic_debug module Jim Cromie
2022-08-05 21:53 ` [PATCH v5 09/33] dyndbg: drop EXPORTed dynamic_debug_exec_queries Jim Cromie
2022-08-05 21:53 ` [PATCH v5 10/33] dyndbg: cleanup local vars in ddebug_init Jim Cromie
2022-08-05 21:53 ` [PATCH v5 11/33] dyndbg: create and use struct _ddebug_info Jim Cromie
2022-08-05 21:53 ` [PATCH v5 12/33] dyndbg: add class_id to pr_debug callsites Jim Cromie
2022-08-05 21:53 ` [PATCH v5 13/33] dyndbg: add __pr_debug_cls for testing Jim Cromie
2022-08-05 21:53 ` [PATCH v5 14/33] dyndbg: add DECLARE_DYNDBG_CLASSMAP macro Jim Cromie
2022-08-05 21:53 ` [PATCH v5 15/33] kernel/module: add __dyndbg_classes section Jim Cromie
2022-08-05 21:53 ` [PATCH v5 16/33] dyndbg: add ddebug_attach_module_classes Jim Cromie
2022-08-05 21:53 ` [PATCH v5 17/33] dyndbg: validate class FOO by checking with module Jim Cromie
2022-08-05 21:53 ` [PATCH v5 18/33] doc-dyndbg: describe "class CLASS_NAME" query support Jim Cromie
2022-08-05 21:53 ` [PATCH v5 19/33] doc-dyndbg: edit dynamic-debug-howto for brevity, audience Jim Cromie
2022-08-06 12:40 ` Bagas Sanjaya
2022-08-05 21:53 ` [PATCH v5 20/33] dyndbg: add drm.debug style (drm/parameters/debug) bitmap support Jim Cromie
2022-08-05 21:53 ` [PATCH v5 21/33] dyndbg: test DECLARE_DYNDBG_CLASSMAP, sysfs nodes Jim Cromie
2022-08-05 21:53 ` [PATCH v5 22/33] drm_print: condense enum drm_debug_category Jim Cromie
2022-08-05 21:53 ` [PATCH v5 23/33] drm: POC drm on dyndbg - use in core, 2 helpers, 3 drivers Jim Cromie
2022-08-05 21:53 ` [PATCH v5 24/33] drm_print: interpose drm_*dbg with forwarding macros Jim Cromie
2022-08-05 21:53 ` [PATCH v5 25/33] drm_print: wrap drm_*_dbg in dyndbg descriptor factory macro Jim Cromie
2022-08-05 21:53 ` [PATCH v5 26/33] drm-print.h: include dyndbg header Jim Cromie
2022-08-05 21:53 ` [PATCH v5 27/33] drm-print: add drm_dbg_driver to improve namespace symmetry Jim Cromie
2022-08-05 21:53 ` [PATCH v5 28/33] drm_print: refine drm_debug_enabled for jump-label Jim Cromie
2022-08-05 21:53 ` Jim Cromie [this message]
2022-08-05 21:53 ` [PATCH v5 30/33] drm_print: add _ddebug descriptor to drm_*dbg prototypes Jim Cromie
2022-08-05 21:53 ` [PATCH v5 31/33] nouveau: change nvkm_debug/trace to use dev_dbg POC Jim Cromie
2022-08-05 21:53 ` [PATCH v5 32/33] nouveau: adapt NV_DEBUG, NV_ATOMIC to use DRM.debug Jim Cromie
2022-08-05 21:53 ` [PATCH v5 33/33] nouveau: WIP add 2 LEVEL_NUM classmaps for CLI, SUBDEV Jim Cromie
2022-08-09 16:04 ` [PATCH v5 00/33] DYNDBG: opt-in class'd debug for modules, use in drm Daniel Vetter
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