| Message ID | 20190126071122.24557-1-natechancellor@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] drm/i915: Disable -Wuninitialized | expand |
On Sat, Jan 26, 2019 at 12:11:23AM -0700, Nathan Chancellor wrote: > 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. > > Explicitly disable the warning like commit 46e2068081e9 ("drm/i915: > Disable some extra clang warnings"). > > Link: https://github.com/ClangBuiltLinux/linux/issues/220 > Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> > --- > > v1 -> v2: > > * Rather than disable the warning for the problematic folder, disable it > for the entire folder like Matthias's commit. > Link to v1: https://lore.kernel.org/lkml/20181025193601.11746-1-natechancellor@gmail.com/ Since I forgot '--in-reply-to' :( > 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 8300efe60fe1..210d0e8777b6 100644 > --- a/drivers/gpu/drm/i915/Makefile > +++ b/drivers/gpu/drm/i915/Makefile > @@ -22,6 +22,7 @@ subdir-ccflags-y += $(call cc-disable-warning, unused-but-set-variable) > subdir-ccflags-y += $(call cc-disable-warning, sign-compare) > subdir-ccflags-y += $(call cc-disable-warning, sometimes-uninitialized) > subdir-ccflags-y += $(call cc-disable-warning, initializer-overrides) > +subdir-ccflags-y += $(call cc-disable-warning, uninitialized) > subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror > > # Fine grained warnings disable > -- > 2.20.1 >
On Fri, Jan 25, 2019 at 11:13 PM Nathan Chancellor <natechancellor@gmail.com> wrote: > > 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. > > Explicitly disable the warning like commit 46e2068081e9 ("drm/i915: > Disable some extra clang warnings"). > > Link: https://github.com/ClangBuiltLinux/linux/issues/220 > Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Reviewed-by: Nick Desaulniers <nick.desaulniers@gmail.com> probably could give Chris Wilson the suggested by tag. https://lore.kernel.org/lkml/154513398652.1108.7150969916024071452@skylake-alporthouse-com/ > --- > > v1 -> v2: > > * Rather than disable the warning for the problematic folder, disable it > for the entire folder like Matthias's commit. Thanks for following up with a v2.
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 8300efe60fe1..210d0e8777b6 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -22,6 +22,7 @@ subdir-ccflags-y += $(call cc-disable-warning, unused-but-set-variable) subdir-ccflags-y += $(call cc-disable-warning, sign-compare) subdir-ccflags-y += $(call cc-disable-warning, sometimes-uninitialized) subdir-ccflags-y += $(call cc-disable-warning, initializer-overrides) +subdir-ccflags-y += $(call cc-disable-warning, uninitialized) subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror # Fine grained warnings disable
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. Explicitly disable the warning like commit 46e2068081e9 ("drm/i915: Disable some extra clang warnings"). Link: https://github.com/ClangBuiltLinux/linux/issues/220 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> --- v1 -> v2: * Rather than disable the warning for the problematic folder, disable it for the entire folder like Matthias's commit. drivers/gpu/drm/i915/Makefile | 1 + 1 file changed, 1 insertion(+)