[PATCH v2 2/4] drm: switch to generic header check facility

[Jani Nikula <jani.nikula@intel.com>]

Switch to the generic header check facility, and sunset the copy-pasted
local version.

Keep CONFIG_DRM_HEADER_TEST around for fine-grained control of what gets
checked. To be unified later.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Closes: https://lore.kernel.org/r/CAHk-=wjMrqzuUmH-mFbR_46EWEFS=bB=J7h9ABMVy56Vi81PKQ@mail.gmail.com
Fixes: 62ae45687e43 ("drm: ensure drm headers are self-contained and pass kernel-doc")
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: David Airlie <airlied@gmail.com>
Cc: Simona Vetter <simona.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

---

Cc: linux-kbuild@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: intel-xe@lists.freedesktop.org
Cc: intel-gfx@lists.freedesktop.org
---
 drivers/gpu/drm/Kconfig  |  2 +-
 drivers/gpu/drm/Makefile | 15 +--------------
 include/drm/Makefile     | 15 +--------------
 3 files changed, 3 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 2cba2b6ebe1c..10189d0ec30d 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -505,7 +505,7 @@ config DRM_WERROR
 
 config DRM_HEADER_TEST
 	bool "Ensure DRM headers are self-contained and pass kernel-doc"
-	depends on DRM && EXPERT && BROKEN
+	depends on DRM && HEADER_CHECK
 	default n
 	help
 	  Ensure the DRM subsystem headers both under drivers/gpu/drm and
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index ed54a546bbe2..fb2642d46f29 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -225,19 +225,6 @@ obj-$(CONFIG_DRM_LOONGSON) += loongson/
 obj-$(CONFIG_DRM_POWERVR) += imagination/
 
 # Ensure drm headers are self-contained and pass kernel-doc
-hdrtest-files := \
+header-check-$(CONFIG_DRM_HEADER_TEST) += \
 	$(shell cd $(src) && find . -maxdepth 1 -name 'drm_*.h') \
 	$(shell cd $(src) && find display lib -name '*.h')
-
-always-$(CONFIG_DRM_HEADER_TEST) += \
-	$(patsubst %.h,%.hdrtest, $(hdrtest-files))
-
-# Include the header twice to detect missing include guard.
-quiet_cmd_hdrtest = HDRTEST $(patsubst %.hdrtest,%.h,$@)
-      cmd_hdrtest = \
-		$(CC) $(c_flags) -fsyntax-only -x c /dev/null -include $< -include $<; \
-		$(srctree)/scripts/kernel-doc -none $(if $(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
-		touch $@
-
-$(obj)/%.hdrtest: $(src)/%.h FORCE
-	$(call if_changed_dep,hdrtest)
diff --git a/include/drm/Makefile b/include/drm/Makefile
index a7bd15d2803e..ed0567a7956a 100644
--- a/include/drm/Makefile
+++ b/include/drm/Makefile
@@ -1,18 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 
 # Ensure drm headers are self-contained and pass kernel-doc
-hdrtest-files := \
+header-check-$(CONFIG_DRM_HEADER_TEST) += \
 	$(shell cd $(src) && find * -name '*.h' 2>/dev/null)
-
-always-$(CONFIG_DRM_HEADER_TEST) += \
-	$(patsubst %.h,%.hdrtest, $(hdrtest-files))
-
-# Include the header twice to detect missing include guard.
-quiet_cmd_hdrtest = HDRTEST $(patsubst %.hdrtest,%.h,$@)
-      cmd_hdrtest = \
-		$(CC) $(c_flags) -fsyntax-only -x c /dev/null -include $< -include $<; \
-		$(srctree)/scripts/kernel-doc -none $(if $(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
-		touch $@
-
-$(obj)/%.hdrtest: $(src)/%.h FORCE
-	$(call if_changed_dep,hdrtest)
-- 
2.39.5