Messages in this thread Patch in this message | | | From | Nathan Chancellor <> | Subject | [PATCH] drm/i915: Disable -Wuninitialized for intel_breadcrumbs.o | Date | Thu, 25 Oct 2018 12:36:01 -0700 |
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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 [-Werror,-Wuninitialized] DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); ^~ ./include/linux/wait.h:74:63: note: expanded from macro 'DECLARE_WAIT_QUEUE_HEAD_ONSTACK' struct wait_queue_head name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) ~~~~ ^~~~ ./include/linux/wait.h:72:33: note: expanded from macro '__WAIT_QUEUE_HEAD_INIT_ONSTACK' ({ 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.
Link: https://github.com/ClangBuiltLinux/linux/issues/220 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> --- 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 += \ -- 2.19.1
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