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From: Nathan Chancellor <>
To: Jani Nikula <>,
	Joonas Lahtinen <>,
	Rodrigo Vivi <>
	Nick Desaulniers <>,
	Nathan Chancellor <>
Subject: [PATCH] drm/i915: Disable -Wuninitialized for intel_breadcrumbs.o
Date: Thu, 25 Oct 2018 12:36:01 -0700	[thread overview]
Message-ID: <> (raw)

This warning is disabled by default in scripts/Makefile.extrawarn when
W= is not provided but this Makefile adds -Wall after this warning is
disabled so it shows up in the build when it shouldn't:

In file included from drivers/gpu/drm/i915/intel_breadcrumbs.c:895:
drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c:350:34: error:
variable 'wq' is uninitialized when used within its own initialization
./include/linux/wait.h:74:63: note: expanded from macro
        struct wait_queue_head name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name)
                               ~~~~                                  ^~~~
./include/linux/wait.h:72:33: note: expanded from macro
        ({ init_waitqueue_head(&name); name; })
1 error generated.

This warning looks to be a false positive given that init_waitqueue_head
initializes name before it is used. Rather than disable the warning for
the full folder like commit 46e2068081e9 ("drm/i915: Disable some extra
clang warnings"), just disable it for the one problematic file because
it could be a useful warning for other cases.

Signed-off-by: Nathan Chancellor <>
 drivers/gpu/drm/i915/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 1c2857f13ad4..f36c420afb99 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -26,6 +26,7 @@ subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
 # Fine grained warnings disable
 CFLAGS_i915_pci.o = $(call cc-disable-warning, override-init)
+CFLAGS_intel_breadcrumbs.o = $(call cc-disable-warning, uninitialized)
 CFLAGS_intel_fbdev.o = $(call cc-disable-warning, override-init)
 subdir-ccflags-y += \

             reply	other threads:[~2018-10-25 19:36 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-25 19:36 Nathan Chancellor [this message]
2018-10-25 22:20 ` Nick Desaulniers
2018-12-18 11:53   ` Chris Wilson
2018-12-18 19:01     ` Nathan Chancellor
2018-12-18 19:43       ` Nick Desaulniers
2018-12-17 17:41 ` Nathan Chancellor

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