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[73.78.62.130]) by smtp.googlemail.com with ESMTPSA id g19-20020a05660226d300b006bcd45fe42bsm6017753ioo.29.2022.12.05.08.10.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Dec 2022 08:10:21 -0800 (PST) From: Jim Cromie To: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Subject: [PATCH 1/2] drm: mark CONFIG_DRM_USE_DYNAMIC_DEBUG as BROKEN for now Date: Mon, 5 Dec 2022 09:10:04 -0700 Message-Id: <20221205161005.222274-2-jim.cromie@gmail.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221205161005.222274-1-jim.cromie@gmail.com> References: <20221205161005.222274-1-jim.cromie@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jani.nikula@intel.com, daniel.vetter@ffwll.ch, Jim Cromie , robdclark@gmail.com, seanpaul@chromium.org, ville.syrjala@linux.intel.com Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" CONFIG_DRM_USE_DYNAMIC_DEBUG=y has a regression, due to a chicken-egg initialization problem: 1- modprobe i915 i915 needs drm.ko, which is loaded 1st 2- "modprobe drm drm.debug=0x1ff" (virtual/implied) drm.debug is set post-initialization, from boot-args etc 3- `modprobe i915` finishes W/O drm.debug-on-dyndbg that just works, because drm_dbg* does drm_debug_enabled() to check __drm_debug & DRM_UT_ before printing. But the whole point of CONFIG_DRM_USE_DYNAMIC_DEBUG is to avoid that runtime test, by enabling (at end/after module_init) a static-key at selected callsites in the just-loaded module. And since drm.ko is loaded before all dependent modules, no other modules are "just-loaded", and their drm.debug callsites are not present yet, just those in drm.ko itself. CC: Signed-off-by: Jim Cromie --- .v2 - default=N, cuz CI tests BROKEN stuff too. @ville.syrjala --- drivers/gpu/drm/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 34f5a092c99e..5adc8d5b6a40 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -53,7 +53,8 @@ config DRM_DEBUG_MM config DRM_USE_DYNAMIC_DEBUG bool "use dynamic debug to implement drm.debug" - default y + default n + depends on BROKEN # chicken-egg initial enable problem depends on DRM depends on DYNAMIC_DEBUG || DYNAMIC_DEBUG_CORE depends on JUMP_LABEL -- 2.38.1